(a) The angular velocity of the sphere at t = 3.00 s is 45 rad/s.
(b) The angular velocity of the sphere changes direction at t = 0.857 s
(c) The sphere is in rotational equilibrium at t = 0.43 s.
(d) The net torque on the sphere at t = 0.643 s is 4.45 N m.
(e) The rotational kinetic energy of the sphere at t = 0.214 s is 0.273 J.
Radius of sphere, r = 68.0 cm = 0.68 m
Mass of the sphere, m = 1.6 kg
The angular position of sphere, θ(t) = 7t³ − 9t² + 1
(a)
We can differentiate it to obtain its angular velocity:
ω(t) = dθ/dtω(t) = 21t² - 18t
The angular velocity of the sphere at t = 3.00 s is:
ω(3.00) = 21(3.00)² - 18(3.00)
ω(3.00) = 45 rad/s
Therefore, the angular velocity of the sphere at t = 3.00 s is 45 rad/s.
(b)
The angular velocity of the sphere changes direction when:
ω(t) = 0
Therefore,
21t² - 18t = 0
t(21t - 18) = 0
t = 18/21 = 0.857 s
Thus, the angular velocity of the sphere changes direction at t = 0.857 s.
(c)
The sphere is in rotational equilibrium when its angular acceleration is zero:
α(t) = dω/dt
α(t) = 42t - 18 = 0
Thus, t = 0.43 s.
Hence, the sphere is in rotational equilibrium at t = 0.43 s.
(d)
Net torque on the sphere, Τ = Iα
Here, I is the moment of inertia of the sphere, which is given by:
I = (2/5)mr²
I = (2/5)(1.6)(0.68)²
I = 0.397 J s²/rad
The angular acceleration of the sphere at t = 0.643 s is:
α(t) = 42t - 18
α(0.643) = 42(0.643) - 18
α(0.643) = 11.21 rad/s²
The net torque at t = 0.643 s is:
Τ(t) = Iα
Τ(0.643) = (0.397)(11.21)
Τ(0.643) = 4.45 N m
Therefore, the net torque on the sphere at t = 0.643 s is 4.45 N m.
(e)
The rotational kinetic energy of the sphere, Krot = (1/2)Iω²
The angular velocity of the sphere at t = 0.214 s is:
ω(t) = 21t² - 18t
ω(0.214) = 21(0.214)² - 18(0.214)
ω(0.214) = 1.17 rad/s
The rotational kinetic energy at t = 0.214 s is:
Krot = (1/2)Iω²
Krot = (1/2)(0.397)(1.17)²
Krot = 0.273 J
Therefore, the rotational kinetic energy of the sphere at t = 0.214 s is 0.273 J.
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According to relativity theory, if a space trip finds a child biologically older than their parents, then the space trip is taken by the:
A. Child
B. Parents
C. Cannot answer with the information given.
According to relativity theory, if a space trip finds a child biologically older than their parents, then the space trip is taken by the: A. Child
According to the theory of relativity, time dilation occurs when an object is moving at a significant fraction of the speed of light or in the presence of strong gravitational fields. This means that time can appear to pass differently for observers in different reference frames.
In the scenario described, if the space trip involves traveling at speeds close to the speed of light or in the presence of strong gravitational fields, time dilation effects could occur. As a result, the individuals on the space trip would experience time passing slower compared to those on Earth.
Therefore, if the child is on the space trip while the parents remain on Earth, the child would age slower relative to the parents. This means that when the space trip concludes and the child returns to Earth, they may be biologically younger than their parents, even though less time has passed for them.
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Describe the three types of possible Universes we could live in and what will happen to them in the end. In your description, include the value of the cosmological density parameter and the size of the Universe in each case.
There are three types of possible universes based on the value of the cosmological density parameter. In a closed universe (Ω > 1), In an open universe (Ω < 1) & In a flat universe (Ω = 1).
The cosmological density parameter (Ω) represents the ratio of the actual density of matter and energy in the universe to the critical density required for the universe to be flat.
In a closed universe (Ω > 1), the density of matter and energy is high enough for the universe's gravitational pull to eventually overcome the expansion, leading to a collapse.
In an open universe (Ω < 1), the density of matter and energy is below the critical value, resulting in a universe that continues to expand indefinitely.
In a flat universe (Ω = 1), the density of matter and energy precisely balances the critical density, leading to a universe that expands at a gradually slowing rate.
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Two wires that have different linear mass densities, Mi = 0.45 kg/m and M2 = 0.27 kg/m , are spliced together. They are then used as a guy line to secure a telephone pole. Part A If the tension is 300 N, what is the difference in the speed of a wave traveling from one wire to the other?
we need to consider the wave speed equation and the relationship between tension, linear mass density, and wave speed.
Therefore, the difference in speed of a wave traveling from one wire to the other is approximately 7.52 m/s
The wave speed (v) on a string is given by the equation:
v = √(T/μ)
where T is the tension in the string and μ is the linear mass density of the string.
For the first wire with linear mass density M₁ = 0.45 kg/m and tension
T = 300 N, the wave speed v₁ is given by:
v₁ = √(T/M₁)
Similarly, for the second wire with linear mass density M₂ = 0.27 kg/m and tension T = 300 N, the wave speed v₂ is given by:
v₂ = √(T/M₂)
To calculate the difference in speed between the two wires, we subtract the smaller wave speed from the larger wave speed:
Δv = |v₁ - v₂| = |√(T/M₁) - √(T/M₂)|
Substituting the given values:
Δv = |√(300/0.45) - √(300/0.27)|
Δv = |√(666.67) - √(1111.11)|
Δv = |25.81 - 33.33|
Δv ≈ 7.52 m/s
Therefore, the difference in speed of a wave traveling from one wire to the other is approximately 7.52 m/s.
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A 171 g ball is tied to a string. It is pulled to an angle of 6.8° and released to swing as a pendulum. A student with a stopwatch finds that 13 oscillations take 19 s.
The period of the pendulum is approximately 1.46 seconds per oscillation, the frequency is approximately 0.685 oscillations per second, and the angular frequency is approximately 4.307 radians per second.
To analyze the given situation, we can apply the principles of simple harmonic motion and use the provided information to determine relevant quantities.
First, let's calculate the period of the pendulum, which is the time it takes for one complete oscillation.
We can divide the total time of 19 seconds by the number of oscillations, which is 13:
Period (T) = Total time / Number of oscillations
T = 19 s / 13 = 1.46 s/oscillation
Next, let's calculate the frequency (f) of the pendulum, which is the reciprocal of the period:
Frequency (f) = 1 / T
f = 1 / 1.46 s/oscillation ≈ 0.685 oscillations per second
Now, let's calculate the angular frequency (ω) of the pendulum using the formula:
Angular frequency (ω) = 2πf
ω ≈ 2π * 0.685 ≈ 4.307 rad/s
The relationship between the angular frequency (ω) and the period (T) of a pendulum is given by:
ω = 2π / T
Solving for T:
T = 2π / ω
T ≈ 2π / 4.307 ≈ 1.46 s/oscillation
Since we already found T to be approximately 1.46 seconds per oscillation, this confirms our calculations.
In summary, the period of the pendulum is approximately 1.46 seconds per oscillation, the frequency is approximately 0.685 oscillations per second, and the angular frequency is approximately 4.307 radians per second.
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Required information A curve in a stretch of highway has radius 489 m. The road is unbanked. The coefficient of static friction between the tires and road is 0.700 Pantot 178 What is the maximum sate speed that a car can travel around the curve without skidding?
Answer:
The highest safe speed at which a vehicle can pass over the curve without skidding is 57.9 m/s.
The maximum safe speed, V, is given by
V = sqrt(R * g * μ), where
R is the radius of the curve,
The gravitational acceleration is g,
μ is the coefficient of static friction between the tires and road.
Substituting R = 489 m, g = 9.81 m/s², and μ = 0.700, we get:
V = sqrt(489 * 9.81 * 0.700)
V = 57.9m/s
Therefore, the highest safe speed at which a vehicle can pass over the curve without skidding is 57.9 m/s.
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The capacitance of an empty capacitor is 4.70 μF. The capacitor is connected to a 12-V battery and charged up. With the capacitor connected to the battery, a slab of dielectric material is inserted between the plates. As a result, 9.30 × 10-5 C of additional charge flows from one plate, through the battery, and onto the other plate. What is the dielectric constant of the material?
The dielectric constant of the material is approximately 1.98.
To find the dielectric constant of the material, we can use the formula:
C' = κC
where C' is the capacitance with the dielectric material inserted, C is the original capacitance without the dielectric, and κ is the dielectric constant of the material.
Given:
C = 4.70 μF = 4.70 × 10^-6 F
Q = 9.30 × 10^-5 C
V = 12 V
The capacitance can also be expressed as:
C = Q / V
Rearranging the equation to solve for Q:
Q = C × V
Substituting the given values:
Q = (4.70 × 10^-6 F) × (12 V)
= 5.64 × 10^-5 C
The additional charge Q' is given as 9.30 × 10^-5 C.
Now, we can find the dielectric constant:
C' = κC
C' = Q' / V
κC = Q' /
κ = Q' / (CV)
κ = (9.30 × 10^-5 C) / [(4.70 × 10^-6 F) × (12 V)]
κ = 1.98
Therefore, the dielectric constant of the material is approximately 1.98.
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Coulomb's Law Two point charges Q. and Qz are 1.50 m apart, and their total charge is 15.4 wc. If the force of repulsion between them is 0.221 N, what are magnitudes of the two charges? Enter the smaller charge in the first box Q1 Q2 Submit Answer Tries 0/10 If one charge attracts the other with a force of 0.249N, what are the magnitudes of the two charges if their total charge is also 15.4 C? The charges are at a distance of 1.50 m apart. Note that you may need to solve a quadratic equation to reach your answer. Enter the charge with a smaller magnitude in the first box
Answer:
Since the product of the charges is known, we cannot determine the individual magnitudes of Q1 and Q2 to calculate the specific values of Q1 and Q2 separately.
Distance between the charges (r) = 1.50 m
Total charge (Q) = 15.4 C
Force of repulsion (F) = 0.221 N
According to Coulomb's Law, the force of repulsion between two point charges is given by:
F = k * (|Q1| * |Q2|) / r^2
Where F is the force,
k is the electrostatic constant,
|Q1| and |Q2| are the magnitudes of the charges, and
r is the distance between them.
Rearranging the equation, we can solve for the product of the charges:
|Q1| * |Q2| = (F * r^2) / k
Substituting the given values:
|Q1| * |Q2| = (0.221 N * (1.50 m)^2) / (9 x 10^9 N·m^2/C^2)
Simplifying the expression:
|Q1| * |Q2| ≈ 0.0495 x 10^-9 C^2
Since the product of the charges is known, we cannot determine the individual magnitudes of Q1 and Q2 with the provided information. The information given does not allow us to calculate the specific values of Q1 and Q2 separately.
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You have a circular loop of wire in the plane of the page with initial radius 1.0 m which shrinks to a radius of 1 m. It sits in a constant magnetic field B = 10T pointing into the page. Assume the transformation occurs over 10 seconds and no part of the wire exits the field. Also assume an internal resistance of 30 Ω. What average current is produced within the loop and in which direction?
a. 79 mA, CW
b. 79 mA, CCW
c. 701 mA, CCW
d. Zero
The average current that is produced within the loop is zero.
option D.
What is the emf induced?The emf induced in the circuit is calculated by applying the following formula for electromagnetic induction as follows;
emf = NBA/t
where;
N is the number of turnsB is the constant magnetic fieldA is the area of the loopt is the timeThe area of the circular loop is calculated as;
A = π(r₁ - r₂)²
where;
r₁ is the initial radius
r₂ is the final radius
A = π (1² - 1²)
A = 0 m²
The induced emf is calculated as;
emf = (1 x 10T x 0 m² ) / ( 10 s )
emf = 0 V
The current produced is calculated as follows;
I = emf / R
I = 0 V / 30 Ω.
I = 0 A
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The light beam shown in the figure below makes an angle of a =20.2 ∘
with the normal line NN in the linseed oll. Determine the anale θ. (The refractive index for linseed oll is 1.48.)
The angle of refraction of the light beam in the linseed oil is approximately 12.5°.
The light beam shown in the figure below makes an angle of a = 20.2° with the normal line NN in the linseed oil. Determine the angle θ. (The refractive index for linseed oil is 1.48).
The angle of refraction (θ) of the given light beam can be calculated using Snell's law. According to Snell's law of refraction,n₁sinθ₁ = n₂sinθ₂Where, n₁ = refractive index of the first medium, i.e., air (or vacuum), θ₁ = angle of incidence of the light ray, n₂ = refractive index of the second medium, i.e., linseed oil, θ₂ = angle of refraction of the light ray.
In this case, the angle of incidence (θ₁) is 90° since it is perpendicular to the normal line NN. Therefore, sin θ₁ = 1. The refractive index (n₂) for linseed oil is 1.48. The angle of incidence (a) of the light ray with respect to the normal is 20.2°.
Thus, applying Snell's law of refraction,n₁sinθ₁ = n₂sinθ₂⇒ sin θ₂ = (n₁ / n₂) × sin θ₁⇒ sin θ = (1 / 1.48) × sin 20.2°≈ 0.2154⇒ θ ≈ sin⁻¹ 0.2154≈ 12.5°
Therefore, the angle of refraction of the light beam in the linseed oil is approximately 12.5°.
The angle of refraction (θ) is approximately 12.5°. The light beam shown in the figure below makes an angle of a = 20.2° with the normal line NN in the linseed oil. The refractive index for linseed oil is 1.48.
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27. The electric potential \( 1.6 \mathrm{~m} \) from a point charge \( q \) is \( 3.8 \times 10^{4} \mathrm{~V} \). What is the value of \( a \) ?
The value of a is 4.2 cm.
Given information:The electric potential \( 1.6 \mathrm{~m} \) from a point charge \( q \) is \( 3.8 \times 10^{4} \mathrm{~V} \).We need to find the value of a.The potential due to a point charge at a distance r is given by,V= kq/r,where k is the electrostatic constant or Coulomb’s constant which is equal to 1/(4πε0) and its value is k = 9 × 109 Nm2/C2ε0 is the permittivity of free space and its value is ε0 = 8.854 × 10−12 C2/Nm2.
Now substituting the given values we have,3.8 × 104 = (9 × 109 × q)/1.6The value of q is3.8 × 104 × 1.6/9 × 109= 6.747 × 10−7 C.Now we need to find the value of a.We know that the potential at a distance r from a point charge q is given by,V = kq/r (k = 9 × 109 Nm2/C2).Here, V = 3.8 × 104 V and r = 1.6 mSubstituting the given values we have,3.8 × 104 = (9 × 109 × 6.747 × 10−7)/aa = 0.042 m or a = 4.2 cmAnswer:Therefore, the value of a is 4.2 cm.
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The counter-clockwise circulating current in a solenoid is increasing at a rate of 4.54 A/s. The cross-sectional area of the solenoid is 3.14159 cm², and there are 395 tums on its 21.4 cm length. What is the magnitude of the self-induced emf & produced by the increasing current? Answer in units of mV. Answer in units of mV part 2 of 2 Choose the correct statement 11 The & attempts to move the current in the solenoid in the clockwise direction x 2 The E tries to keep the current in the solenoid flowing in the counter-clockwise direction 03 The does not effect the current in the solenoid 4 Not enough information is given to determine the effect of the E By the right hand rule, the E produces mag- 5. netic fields in a direction perpendicular to the prevailing magnetic field
The emf tries to keep the current in the solenoid flowing in the counter-clockwise direction. When something moves in the opposite direction to the way in which the hands of a clock move round in known as counterclockwise.
To calculate the magnitude of the self-induced electromotive force (emf) produced by the increasing current in the solenoid, we can use Faraday's law of electromagnetic induction, which states that the emf induced in a coil is equal to the rate of change of magnetic flux through the coil.
The formula to calculate the emf is:
emf = -N * dΦ/dt
where N is the number of turns in the solenoid and dΦ/dt is the rate of change of magnetic flux.
Rate of change of current (di/dt) = 4.54 A/s (since current is increasing at this rate)
Cross-sectional area (A) = 3.14159 cm² = 0.000314159 m²
Length of the solenoid (l) = 21.4 cm = 0.214 m
Number of turns (N) = 395
First, we need to calculate the magnetic flux (Φ) through the solenoid.
The magnetic flux is given by the formula:
Φ = B * A
where B is the magnetic field and A is the cross-sectional area.
To calculate the magnetic field, we use the formula:
B = μ₀ * (N / l) * I
where μ₀ is the permeability of free space, N is the number of turns, l is the length of the solenoid, and I is the current.
Permeability of free space (μ₀) = 4π × 10⁻⁷ T·m/A
Calculations:
B = (4π × 10⁻⁷ T·m/A) * (395 / 0.214 m) * (4.54 A/s)
B ≈ 0.0332 T
Now, we can calculate the rate of change of magnetic flux (dΦ/dt):
dΦ/dt = B * A * (di/dt)
dΦ/dt = 0.0332 T * 0.000314159 m² * (4.54 A/s)
dΦ/dt ≈ 4.20 × 10⁻⁶ Wb/s
Finally, we can calculate the magnitude of the self-induced emf:
emf = -N * dΦ/dt
emf = -395 * (4.20 × 10⁻⁶ Wb/s)
emf ≈ -1.66 mV
The magnitude of the self-induced emf produced by the increasing current is approximately 1.66 mV.
Regarding the second part of your question, according to the right-hand rule, the self-induced emf tries to keep the current in the solenoid flowing in the same direction, which in this case is the counter-clockwise direction. So, the correct statement is: The emf tries to keep the current in the solenoid flowing in the counter-clockwise direction.
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Q6. Explain what the difference is between an
asteroid, a rocky planet, a gas giant, a brown dwarf and a star.
[10 pts]
Asteroids, rocky planets, gas giants, brown dwarfs, and stars are all different celestial objects in the universe. Each of these objects has different characteristics that distinguish them from one another.
The difference between an asteroid, a rocky planet, a gas giant, a brown dwarf, and a star are explained below.
Asteroids: Asteroids are small, rocky objects that orbit the Sun. They are too small to be classified as planets, but too large to be classified as meteoroids. Most asteroids are found in the asteroid belt between Mars and Jupiter.
Some of the largest asteroids in the asteroid belt are Ceres, Vesta, and Pallas.
Rocky Planets: Rocky planets are terrestrial planets that are composed primarily of rock and metal. They have solid surfaces and are relatively small compared to gas giants.
The rocky planets in our solar system are Mercury, Venus, Earth, and Mars.Gas Giants: Gas giants are planets that are composed primarily of hydrogen and helium. They are much larger than rocky planets and have thick atmospheres. The gas giants in our solar system are Jupiter, Saturn, Uranus, and Neptune.
Brown Dwarfs: Brown dwarfs are objects that are too small to be stars, but too large to be gas giants. They are also known as failed stars because they do not have enough mass to sustain nuclear fusion in their cores.
Stars: Stars are massive, luminous objects that are held together by gravity.
They generate energy through nuclear fusion in their cores. There are many different types of stars, ranging from small red dwarfs to massive blue giants. The Sun is a typical yellow dwarf star.
Asteroids, rocky planets, gas giants, brown dwarfs, and stars are all different celestial objects with unique characteristics. Asteroids are small, rocky objects that orbit the Sun.
Rocky planets are terrestrial planets that are composed primarily of rock and metal, while gas giants are planets that are composed primarily of hydrogen and helium.
Brown dwarfs are objects that are too small to be stars, but too large to be gas giants, and stars are massive, luminous objects that generate energy through nuclear fusion in their cores. Understanding the differences between these celestial objects is important for astronomers to study the universe and its history.
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A 3 kg wooden block is being pulled across a flat table by a single attached rope. The rope has a tension of 6 N and is angled 18 degrees above the horizontal. The coefficient of kinetic friction between the block and the table is unknown. At t = 0.6 seconds, the speed of the block is 0.08 m/s. Later, at t = 1.3 seconds, the speed of the block is 0.16 m/s. What is the total work done by the surroundings on the wooden block between t = 0.6 seconds and t = 1.3 seconds?
The total work done by the surroundings on the wooden block between t = 0.6 seconds and t = 1.3 seconds is 0.0288 Joules.
To calculate the total work done by the surroundings on the wooden block between t = 0.6 seconds and t = 1.3 seconds, we need to consider the change in kinetic energy of the block during that time interval. The work done can be calculated using the work-energy principle;
Total Work = Change in Kinetic Energy
The change in kinetic energy can be determined by calculating the difference between the final and initial kinetic energies of the block. The initial kinetic energy can be calculated using the initial speed of the block, and the final kinetic energy can be calculated using the final speed of the block.
Initial Kinetic Energy = (1/2) × mass × initial velocity²
Final Kinetic Energy = (1/2) × mass × final velocity²
Given;
Mass of the wooden block (m) = 3 kg
Initial speed of the block (v₁) = 0.08 m/s
Final speed of the block (v₂) = 0.16 m/s
Let's calculate the total work done by the surroundings on the wooden block;
Initial Kinetic Energy = (1/2) × 3 kg × (0.08 m/s)²
Final Kinetic Energy = (1/2) × 3 kg × (0.16 m/s)²
Change in Kinetic Energy = Final Kinetic Energy - Initial Kinetic Energy
Total Work = Change in Kinetic Energy
Now, let's calculate the values;
Initial Kinetic Energy = (1/2) × 3 kg × (0.08 m/s)² = 0.0096 J
Final Kinetic Energy = (1/2) × 3 kg × (0.16 m/s)² = 0.0384 J
Change in Kinetic Energy = 0.0384 J - 0.0096 J = 0.0288 J
Therefore, the total work done by the surroundings on the wooden block between t = 0.6 seconds and t = 1.3 seconds is 0.0288 Joules.
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A particle with a mass two times that of an electron is moving at a speed of 0.880c. (a) Determine the speed (expressed as a multiple of the speed of light) of a neutron that has the same kinetic energy as the particle. When calculating gamma factors, keep values to six places beyond the decimal point and then round your final answer to three significant figures.
_______________ c (b) Determine the speed (expressed as a multiple of the speed of light) of a neutron that has the same momentum as the particle. When calculating gamma factors, keep values to six places beyond the decimal point and then round your final answer to three significant figures.
_______________ c
(a) The speed of a neutron with the same kinetic energy as the particle is 0.03 c.
(b) The speed of the neutron with same momentum is 0.00096 c.
What is the speed of the neutron?(a) The speed of a neutron with the same kinetic energy as the particle is calculated as follows;
Kinetic energy of the particle;
K.E = ¹/₂mv²
where;
m is the mass of the particlev is the speed of the particleK.E = ¹/₂ x (2 x 9.11 x 10⁻³¹) (0.88c)²
K.E = 7.05 x 10⁻³¹c²
The speed of the neutron is calculated as;
v² = 2K.E / m
v = √ (2 x K.E / m )
v = √ ( 2 x 7.05 x 10⁻³¹c² / 1.67 x 10⁻²⁷ )
v = 0.03 c
(b) The speed of the neutron with same momentum is calculated as;
v₂ = (m₁v₁) / m₂
v₂ = ( 2 x 9.11 x 10⁻³¹ x 0.88c) / ( 1.67 x 10⁻²⁷)
v₂ = 0.00096 c
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A square loop (length along one side =12 cm ) rotates in a constant magnetic field which has a magnitude of 3.1 T. At an instant when the angle between the field and the normal to the plane of the loop is equal to 25 ∘
and increasing at the rate of 10 ∘
/s, what is the magnitude of the induced emf in the loop? Write your answer in milli-volts. Question 3 1 pts A 15-cm length of wire is held along an east-west direction and moved horizontally to the north with a speed of 3.2 m/s in a region where the magnetic field of the earth is 67 micro-T directed 42 ∘
below the horizontal. What is the magnitude of the potential difference between the ends of the wire? Write your answer in micro-volts.
Question 1:
Given, Length along one side, L = 12cmMagnetic field magnitude, B = 3.1TAt an instant when, the angle between the field and the normal to the plane of the loop, θ = 25°
And, the angle is increasing at the rate of, dθ/dt = 10°/sInduced emf in the loop is given by,ε = NBAω sinθ, where, N = a number of turns in the loop.
A = area of the loop ω = angular velocity of the loop
dθ/dt = rate of change of angle= 10°/s = 10π/180 rad/s
Putting the values,ε = NBAω sinθε = N(L)²B(ω)sinθε = (1²)(12 × 10⁻²)²(3.1)(10π/180)sin25°ε = 2.36 × 10⁻⁴ sin25°V
Now, converting into milli-voltsε = 2.36 × 10⁻¹ µV
So, the magnitude of the induced emf in the loop is 0.236 mV.
Question 2:
Given, Length of the wire, L = 15 cm = 0.15 mSpeed of wire, v = 3.2 m/s Magnetic field of earth, B = 67 µT = 67 × 10⁻⁶ T
The angle between the magnetic field and the horizontal, θ = 42°Now, induced emf is given by,ε = BLv sinθ Where B = Magnetic field, L = Length of wire, v = Speed of wire, θ = Angle between the magnetic field and velocity of the wire.
Putting the values,ε = (67 × 10⁻⁶)(0.15)(3.2)sin42°ε = 9.72 × 10⁻⁸ sin42°V
Now, converting into micro-volts ε = 97.2 × 10⁻³ µV
So, the magnitude of the potential difference between the ends of the wire is 97.2 µV.
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(a) Show that when the recoil kinetic energy of the atom, p²/2M, is taken into account the frequency of a photon emitted in a transition between two atomic levels of energy difference AE is reduced by a factor which is approximately (1-AE/2Mc²). (Hint: The recoil momentum is p = hv/c.) (b) Compare the wavelength of the light emitted from a hydrogen atom in the 3→ 1 transition when the recoil is taken into account to the wave- length without accounting for recoil.
The frequency of photon emitted in a transition between two atomic energy levels is reduced by factor of approximately (1 - AE/2Mc²). Taking recoil into account affects the wavelength of light emitted from hydrogen atom in the 3 → 1 transition.
(a) We start with the equation for energy conservation: hf = AE + p²/2M,
We can express the recoil momentum as p = hv/c
hf = AE + (hv/c)²/2M.
hf = AE + hv²/(2Mc²).
Now, we can factor out hv²/2Mc² from the right-hand side:
hf = (1 + AE/(2Mc²)) * hv²/2Mc².
Therefore, the frequency of the emitted photon is reduced by a factor of approximately (1 - AE/2Mc²) when the recoil kinetic energy is taken into account.
(b) The wavelength of the emitted light can be related to the frequency by the equation λ = c/f.
Taking into account recoil, the reduced frequency is f₂ = f₁/(1 - AE/2Mc²).
Therefore, the wavelength of the light emitted when the recoil is considered is λ₂ = c/f₂ = c * (1 - AE/2Mc²) / f₁.
λ₂/λ₁ = (c * (1 - AE/2Mc²) / f₁) / (c/f₁) = 1 - AE/2Mc².
Hence, the ratio of the wavelengths with and without accounting for recoil is approximately (1 - AE/2Mc²).
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Two life preservers have identical volumes, but one is filled with styrofoam while the other is filled with small lead pellets. If you fell overboard into deep water, which would provide you the greatest buoyant force? same on each as long as their volumes are the same styrofoam filled life preserver O not enough information given lead filled life preserver
Two life preservers have identical volumes, but one is filled with styrofoam while the other is filled with small lead pellets. the buoyant force provided by both the styrofoam-filled and lead-filled life preservers would be the same,
The buoyant force experienced by an object immersed in a fluid depends on the volume of the object and the density of the fluid. In this case, the two life preservers have identical volumes, which means they displace the same volume of water when submerged.nThe buoyant force experienced by an object is equal to the weight of the fluid displaced by the object. The weight of the fluid is directly proportional to its density. Since the life preservers have the same volume, the buoyant force they experience will be the same as long as the density of the fluid (water, in this case) remains constant.
Therefore, the buoyant force provided by both the styrofoam-filled and lead-filled life preservers would be the same, assuming their volumes are identical. The choice of material (styrofoam or lead pellets) inside the life preserver does not affect the buoyant force as long as the volumes of the preservers are the same. The buoyant force solely depends on the volume of the object and the density of the fluid.
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A coil has 150 turns enclosing an area of 12.9 cm2 . In a physics laboratory experiment, the coil is rotated during the time interval 0.040 s from a position in which the plane of each turn is perpendicular to Earth's magnetic field to one in which the plane of each turn is parallel to the field. The magnitude of Earth's magnetic field at the lab location is 5.40×10−5T .
Part A: What is the magnitude of the magnetic flux through one turn of the coil before it is rotated?
Express your answer in webers.
Part B: What is the magnitude of the magnetic flux through one turn of the coil after it is rotated?
Express your answer in webers.
A coil has 150 turns enclosing an area of 12.9 cm2 . the magnitude of the magnetic flux through one turn of the coil before it is rotated is approximately 6.9564 × 10^−9 Weber. the magnitude of the magnetic flux through one turn of the coil after it is rotated is also approximately 6.9564 × 10^−9 Weber.
Part A: To calculate the magnitude of the magnetic flux through one turn of the coil before it is rotated, we can use the formula:
Φ = B * A * cos(θ),
where Φ is the magnetic flux, B is the magnetic field, A is the area, and θ is the angle between the magnetic field and the normal to the coil.
Since the plane of each turn is initially perpendicular to Earth's magnetic field, the angle θ is 90 degrees. Substituting the given values, we have:
Φ = (5.40×10^−5 T) * (12.9 cm^2) * cos(90°).
Note that we need to convert the area to square meters to match the units of the magnetic field:
Φ = (5.40×10^−5 T) * (12.9 × 10^−4 m^2) * cos(90°).
Simplifying the equation, we find:
Φ = 6.9564 × 10^−9 Wb.
Therefore, the magnitude of the magnetic flux through one turn of the coil before it is rotated is approximately 6.9564 × 10^−9 Weber.
Part B: After the coil is rotated, the plane of each turn becomes parallel to the magnetic field. In this case, the angle θ is 0 degrees, and the cosine of 0 degrees is 1. Therefore, the magnetic flux through one turn remains the same as in Part A:
Φ = 6.9564 × 10^−9 Wb.
Hence, the magnitude of the magnetic flux through one turn of the coil after it is rotated is also approximately 6.9564 × 10^−9 Weber.
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Objective: Go through a few problems involving Newton's Laws and friction! Tasks (10 points) 1. Find the mass of a 745 N person and find the weight of an 8.20 kg mass. Use metric units! What is known? What is unknown? What is the basic equation? What is the working equation? Plug in your values. 2. A 2000 kg car is slowed down uniformly from 20.0 m/s to 5.00 m/s in 4.00 seconds. a. What average force acted on the car during that time? What is known? What is unknown? What is the basic equation? What is the working equation? Plug in your values. What is the answer? b. How far did the car travel during that time? What is known? What is unknown? What is the basic equation? What is the working equation? Plug in your values. What is the answer? 3. A 38.4-pound block sits on a level surface, and a horizontal 21.3-pound force is applied to the block. If the coefficient of static friction between the block and the surface is 0.75, does the block start to move? Hint: it may help to draw a force diagram to visualize where everything is happening. What is known? What is unknown? What is the basic equation? What is the working equation? Plug in your values. What is the answer?
The average force acted on the car during the deceleration is 7500 N.The car traveled a distance of 60 meters during the deceleration.The block does not start to move because the applied force is not sufficient to overcome the static friction.
To find the mass of a person given their weight, we use the equation weight = mass × gravity, where weight is given as 745 N. Solving for mass, we have mass = weight / gravity. Assuming standard gravity of 9.8 m/s², the mass is approximately 75.7 kg. To find the weight of a mass, we use the equation weight = mass × gravity, where mass is given as 8.20 kg. Plugging in the values, we have weight = 8.20 kg × 9.8 m/s², which gives a weight of approximately 80.2 N.
2a. To find the average force acting on the car during deceleration, we use Newton's second law, which states that force = mass × acceleration. The change in velocity is 20.0 m/s - 5.00 m/s = 15.0 m/s, and the time is given as 4.00 seconds. The acceleration is calculated as change in velocity / time, which is 15.0 m/s / 4.00 s = 3.75 m/s². Plugging in the mass of 2000 kg and the acceleration, we have force = 2000 kg × 3.75 m/s² = 7500 N.
2b. To determine the distance the car traveled during deceleration, we can use the equation of motion x = x₀ + v₀t + 0.5at². Since the car is slowing down, the final velocity is 5.00 m/s, the initial velocity is 20.0 m/s, and the time is 4.00 seconds. Plugging in these values and using the equation, we get x = 0 + 20.0 m/s × 4.00 s + 0.5 × (-3.75 m/s²) × (4.00 s)² = 60 meters.
To determine if the block starts to move, we need to compare the applied force to the maximum static friction. The equation for static friction is fs ≤ μs × N, where fs is the force of static friction, μs is the coefficient of static friction, and N is the normal force. The normal force is equal to the weight of the block, which is given as 38.4 pounds. Converting the weight to Newtons, we have N = 38.4 lb × 4.45 N/lb = 171.12 N. Plugging in the values, we have fs ≤ 0.75 × 171.12 N. Since the applied force is 21.3 pounds, which is less than the maximum static friction, the block does not start to move.
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What is the required radius of a cyclotron designed to accelerate protons to energies of 36.0MeV using a magnetic field of 5.18 T ?
The required radius of the cyclotron is 0.33 meters
A cyclotron is a device that is used to accelerate charged particles to high energies by the application of high-frequency radio-frequency (RF) electromagnetic fields.
It works on the principle of a charged particle moving perpendicular to a magnetic field line. When the particle moves perpendicular to the magnetic field lines, it experiences a force that makes it move in a circular path. The radius of a cyclotron can be calculated using the formula: r = mv/qB
where m is the mass of the particle, v is its velocity, q is its charge, and B is the magnetic field strength.
In this case, we are given that the protons are to be accelerated to energies of 36.0 MeV using a magnetic field of 5.18 T. The mass of a proton is 1.67 x 10⁻²⁷ kg, and its charge is 1.6 x 10⁻¹⁹ C.
The energy of the proton is given by E = mv²/2.
Solving for v, we get:v = √(2E/m) = √(2 x 36 x 10⁶ x 1.6 x 10⁻¹⁹/1.67 x 10⁻²⁷) = 3.02 x 10⁷ m/s
Substituting these values into the formula for r, we get:r = mv/qB = (1.67 x 10⁻²⁷ x 3.02 x 10⁷)/(1.6 x 10⁻¹⁹ x 5.18) = 0.33 m
Therefore, the required radius of the cyclotron is 0.33 meters (or 33 cm).
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A helicopter lifts a 82 kg astronaut 19 m vertically from the ocean by means of a cable. The acceleration of the astronaut is g/10. How much work is done on the astronaut by (a) the force from the helicopter and (b) the gravitational force on her? Just before she reaches the helicopter, what are her (c) kinetic energy and (d) speed? (a) Number ______________ Units _____________
(b) Number ______________ Units _____________
(c) Number ______________ Units _____________
(d) Number ______________ Units _____________
Answer: (a) The work done on the astronaut by the force from the helicopter is 1528.998 J. The units of work are Joules.
(b) The work done on the astronaut by the gravitational force on her is 15284.98 J. The units of work are Joules.
(c) The kinetic energy of the astronaut just before she reaches the helicopter is 15224.22 J. The units of work are Joules.
(d) Therefore, her speed just before she reaches the helicopter is 7.26 m/s. The units of speed are m/s.
Mass of the astronaut, m = 82 kg
Height to which the astronaut is lifted, h = 19 m
Acceleration of the astronaut, a = g/10 = 9.81/10 m/s² = 0.981 m/s²
(a) Work done
W = Fd
Here, d = h = 19 m,
The force applied, F = ma
F = 82 x 0.981
= 80.442 N.
Work done on the astronaut by the force from the helicopter, W₁ = FdW₁ = 80.442 x 19 = 1528.998 J.
The work done on the astronaut by the force from the helicopter is 1528.998 J. The units of work are Joules.
(b) The work done on the astronaut by the gravitational force on her is given by the product of the force of gravity and the displacement of the astronaut.
W = mgd
Here, d = h = 19 m
The gravitational force acting on the astronaut, mg = 82 x 9.81 = 804.42 N.
Work done on the astronaut by the gravitational force on her, W₂ = mgdW₂ = 804.42 x 19 = 15284.98 J.
The work done on the astronaut by the gravitational force on her is 15284.98 J. The units of work are Joules.
(c) Before the astronaut reaches the helicopter, her potential energy is converted into kinetic energy.
Therefore, the kinetic energy of the astronaut just before she reaches the helicopter is equal to the potential energy she has at the height of 19 m.
Kinetic energy of the astronaut, KE = Potential energy at 19 m.
KE = mgh
KE = 82 x 9.81 x 19
KE = 15224.22 J.
The kinetic energy of the astronaut just before she reaches the helicopter is 15224.22 J. The units of work are Joules.
(d) The kinetic energy of the astronaut just before she reaches the helicopter is equal to the work done on her by the force from the helicopter just before she reaches the helicopter. So,
KE = W₁
Therefore, her speed just before she reaches the helicopter can be found by equating the kinetic energy to the work done on her by the force from the helicopter and solving for velocity.
KE = 1/2 mv²
v = √(2KE/m)
v = √(2 x 1528.998/82)
v = 7.26 m/s.
Therefore, her speed just before she reaches the helicopter is 7.26 m/s. The units of speed are m/s.
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Question 32 (1 point) Vibrations at an angle of 90° to the direction of propagation are waves. Question 33 (1 point) The intensity of a sound at 200 m is A times less than the intensity of sound at 100 m. Question 34 (1 point) Sounds above the sonic frequency range of humans are known as A and below the sonic frequency range the sound are called A/ Question 35 (1 point) The number of cycles per second a sound wave delivers to the ear is its A to a physicist but musicians or the general public refer to this as Question 36 (1 point) The Doppler effect is associated with the difference in A heard when a source of sound and the ear are moving relative to each other.
Answer: Only statement 32 is false.
32: Vibrations at an angle of 90° to the direction of propagation are waves.
This statement is false. The vibrations which are perpendicular to the direction of propagation of the wave is known as a transverse wave. The vibrations which are in the direction of propagation of the wave are known as longitudinal waves.
33: The intensity of a sound at 200 m is A times less than the intensity of sound at 100 m.
This is true. The intensity of sound is inversely proportional to the square of the distance from the source. Therefore, if the distance is doubled, then the intensity decreases by four times, hence A times less than the intensity of the sound at 100 m.
34: Sounds above the sonic frequency range of humans are known as ultrasonic and below the sonic frequency range the sound are called infrasonic.
This statement is true. Infrasonic waves are the waves with frequencies less than 20 Hz whereas the waves with frequencies greater than 20 kHz are known as ultrasonic waves.
35: The number of cycles per second a sound wave delivers to the ear is its frequency to a physicist but musicians or the general public refer to this as pitch.
This statement is true. The number of cycles per second of a sound wave is its frequency which is measured in hertz. Pitch is how high or low a sound is and it is usually associated with the frequency of the sound wave.
36: The Doppler effect is associated with the difference in frequency heard when a source of sound and the ear are moving relative to each other.
This statement is true. The Doppler effect is the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source. This effect is used in various applications like medical ultrasound, astronomical measurements, and weather radar systems.
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Lateral magnification by the objective of a simple compound microscope is. m 1
=−10×. Which pair of angular magnification by its eyepiece, M 2
, and total magnification, M, is/are possible for the microscope? 14. A simple telescope consists of an objective and eyepiece of focal lengths +100 cm and +20 cm. Which of the following is/are TRUE about the telescope? A. The telescope length is 1.2 m. B. The power of the objective is +1.0D C. The final image formed by the telescope is virtual. 15. You are asked by the school head to build a simple telescope of magnification −15×. Which pair of lens combinations is/are suitable for the telescope? 16. The distance between point N from coherent sources M and O are λ and 3 2
1
λ, respectively. Points M,N and O lie in a straight line. Point N is located between M and O. Which is/are true statement(s) about the situation. A. Point N is an antinode point. B. The path length between source M and O is 4 2
1
λ. C. The path difference between sources M and O at point N is 2 2
1
λ 17. A bubble seems to be colourful when shone with white light. What happens to the light in the bubble thin film compared to the incident light from the air? A. The light is slower in the thin film. B. The wavelength of the light is shorter in the film. C. The frequency of the light does not change in the film. 18. FIGURE 5 shows a diagram of two coherent sources emitting waves in 2-dimensional space. Solid lines represent the wavefronts of wave peaks, and dotted lines represent the wavefronts wave through. Select the thick line(s) representing the nodal line(s). 19. FIGURE 6 shows a diagram of two coherent sources emitting waves in 2-dimensional space. Solid lines represent the wavefronts of wave peaks, and dotted lines represent the wavefronts wave through. 20. A part of a static bubble in the air momentarily looks reddish under the white light illumination. Given that the refractive index of the bubble is 1.34 and the red light wavelength is 680 nm, what is/are the possible bubble thickness? A. 130 nm B. 180 nm C. 630 nm 21. A thin layer of kerosene (n=1.39) is formed on a wet road (n=1.33). If the film thickness is 180 nm, what is/are the possible visible light seen on the layer? A. 460 nm B. 700 nm C. 1400 nm 22. 400 nm blue light passes through a diffraction grating. The first order bright fringe is located at 10 mm from the central bright. Which of the following is/are true about the situation? A. The width of the bright fringe is 10 cm. B. The distance between consecutive bright fringe is 10 cm. C. The distance between the light source and the screen is 10 cm. 23. In Young's double slits experiment, A. the slits refract light. B. the wavelength of the light source increases and decreases alternatively. C. the width of the central bright is inversely proportional to the distance between slits. 24. A beam of monochromatic light is diffracted by a slit of width 0.45 mm. The diffraction pattern forms on a wall 1.5 m beyond the slit. The width of the central maximum is 2.0 mm. Which of the following is/are TRUE about the experiment? A. The wavelength of the light is 600 nm. B. The width of each bright fringe is 2.0 mm C. The distance between dark fringes is 1.0 mm Devi conducted a light diffraction experiment using a red light. She got the diffraction pattern as shown in FIGURE 7. The distance between indicated dark fringes was measured as 2.5 mm. Which of the following statement is/are TRUE about the experiment? A. She used diffraction grating to get the pattern. B. The width of the central maximum was 2.5 mm. C. The distance between consecutive bright fringes was 2.5 mm.
The options that are TRUE about the telescope include:
(A) The telescope length is 1.2 m.
(C) The final image formed by the telescope is virtual.
How to explain the informationThe telescope length is the sum of the focal lengths of the objective and eyepiece, so it is 1.2 m. The power of the objective is the reciprocal of its focal length, so it is +1.0D. The final image formed by a telescope is always virtual.
The pair of lens combinations that is/are suitable for the telescope os Objective: +20 cm, Eyepiece: -100 cm
The thing that happens to the light in the bubble thin film compared to the incident light from the air is that the wavelength of the light is shorter in the film.
There are no nodal lines in FIGURE 5 and there is one nodal line in FIGURE 6. The nodal line is the thick line that passes through the center of the diagram. At this point, the waves from the two sources are exactly out of phase. So, there is no light at this point.
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An insulated beaker with negligible mass contains liquid water with a mass of 0.230 kg and a temperature of 83.7°C. Part A
How much ice at a temperature of −10.2°C must be dropped into the water so that the final temperature of the system will be 29.0°C ? Take the specific heat of liquid water to be 4190 J/kg·K, the specific heat of ice to be 2100 J/kg·K, and the heat of fusion for water to be 3.34×10⁵ J/kg.
0.109 kg of ice at a temperature of −10.2°C must be dropped into the water so that the final temperature of the system will be 29.0°C.
Mass of water = 0.230 kg
Initial temperature of water = 83.7°C
Specific heat of liquid water = 4190 J/kg·K
Specific heat of ice = 2100 J/kg·K
Heat of fusion for water = 3.34×10⁵ J/kg.
Final temperature of the system = 29.0°C.
The heat released by water = heat absorbed by ice
So, m1c1∆T1 = m2c2∆T2 + mL1where, m1 = Mass of water, m2 = Mass of ice, L1 = Heat of fusion of ice, c1 = Specific heat of water, c2 = Specific heat of ice, ∆T1 = (final temperature of system - initial temperature of water) = (29 - 83.7) = -54.7°C ∆T2 = (final temperature of system - initial temperature of ice) = (29 - (-10.2)) = 39.2°C
By substituting the values, we get: 0.230 × 4190 × (-54.7) = m2 × 2100 × 39.2 + m2 × 3.34×10⁵
On solving the above equation, we get: m2 = 0.109 kg
Therefore, 0.109 kg of ice at a temperature of −10.2°C must be dropped into the water so that the final temperature of the system will be 29.0°C.
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1.38 Compute the energy of the following signals. (a) x₁(t) = eat u(t) for a > 0 (b) x2(t) = eat for a > 0 (c) x3(t) = (1 - [t]) rect(1/2)
The energy of signal x₃(t) is 5.
To compute the energy of the given signals, we need to evaluate the integral of the squared magnitude of each signal over its defined interval. Here's how we can calculate the energy for each signal:
(a) x₁(t) = eat u(t) for a > 0
To calculate the energy of x₁(t), we need to integrate |x₁(t)|² over its interval.
∫(|x₁(t)|²) dt = ∫((eat u(t))²) dt
= ∫(e^2at u(t)) dt
Since the signal x₁(t) is defined for t ≥ 0, we can integrate from 0 to infinity:
∫(|x₁(t)|²) dt = ∫(e^2at) dt from 0 to infinity
= [(-1/2a) * e^2at] from 0 to infinity
= (-1/2a) * (e^2a(infinity) - e^2a(0))
= (-1/2a) * (0 - 1)
= 1/(2a)
So, the energy of x₁(t) is 1/(2a).
(b) x₂(t) = eat for a > 0
To calculate the energy of x₂(t), we integrate |x₂(t)|² over its interval.
∫(|x₂(t)|²) dt = ∫((eat)²) dt
= ∫(e^2at) dt
Again, since the signal x₂(t) is defined for t ≥ 0, we integrate from 0 to infinity:
∫(|x₂(t)|²) dt = ∫(e^2at) dt from 0 to infinity
= [(-1/2a) * e^2at] from 0 to infinity
= (-1/2a) * (e^2a(infinity) - e^2a(0))
= (-1/2a) * (0 - 1)
= 1/(2a)
The energy of x₂(t) is also 1/(2a).
(c) x₃(t) = (1 - [t]) rect(1/2)
To calculate the energy of x₃(t), we integrate |x₃(t)|² over its interval.
∫(|x₃(t)|²) dt = ∫((1 - [t])² rect(1/2)²) dt
= ∫((1 - [t])² (1/4)) dt
Since the signal x₃(t) is defined for 0 ≤ t ≤ 1, we integrate from 0 to 1:
∫(|x₃(t)|²) dt = ∫((1 - [t])² (1/4)) dt from 0 to 1
= ∫((1 - t)² (1/4)) dt from 0 to 1
= (1/4) ∫((1 - 2t + t²)) dt from 0 to 1
= (1/4) [t - t²/2 + t³/3] from 0 to 1
= (1/4) [(1 - 1/2 + 1/3) - (0 - 0 + 0)]
= (1/4) [(6/6 - 3/6 + 2/6)]
= (1/4) [5/6]
= 5/24
Therefore, the energy of x₃(t) is 5
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You have a string with a mass of 0.0121 kg. You stretch the string with a force of 9.97 N, giving it a length of 1.91 m. Then, you vibrate the string transversely at precisely the frequency that corresponds to its fourth normal mode; that is, at its fourth harmonic. What is the wavelength λ4 of the standing wave you create in the string? What is the frequency f4?
The wavelength (λ₄) of the standing wave created in the string at its fourth harmonic is approximately 7.64 m, and the frequency (f₄) is approximately 3.30 Hz.
To find the wavelength (λ₄) and frequency (f₄) of the standing wave in the string at its fourth harmonic, we can follow these steps:
1. Calculate the velocity of the wave on the string.
The velocity (v) of the wave can be determined using the formula:
v = √(Tension / Linear mass density),
where Tension is the applied force and Linear mass density is the mass per unit length of the string.
Force (Tension) = 9.97 N
Mass of the string = 0.0121 kg
Length of the string = 1.91 m
The linear mass density (μ) can be defined as the ratio of mass to length.
μ = 0.0121 kg / 1.91 m = 0.00633 kg/m
Substituting the values into the formula:
v = √(9.97 N / 0.00633 kg/m)
v ≈ 25.24 m/s
2. Determine the wavelength (λ₄) of the standing wave.
At the fourth harmonic, the wavelength is equal to four times the length of the string:
λ₄ = 4 * Length of the string
λ₄ = 4 * 1.91 m
λ₄ ≈ 7.64 m
3. Calculate the frequency (f₄) of the standing wave.
f = v / λ,
where v is the velocity and λ is the wavelength.
Substituting the values:
f₄ = 25.24 m/s / 7.64 m
f₄ ≈ 3.30 Hz
Therefore, the wavelength (λ₄) of the standing wave created in the string at its fourth harmonic is approximately 7.64 m, and the frequency (f₄) is approximately 3.30 Hz.
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A superball is characterised by extreme elasticity (which makes all collisions elastic) and an extremely high coefficient of friction. How should one throw a superball so that it strikes the ground with some (vector) velocity ~v and angular rotation frequency ~ω around its center of mass such that it exactly reverses its path upon impact with the ground?
To throw a superball in such a way that it strikes the ground and exactly reverses its path upon impact, you need to consider the velocity and angular rotation frequency at the moment of release.
Here's how you can achieve this:
1. Initial Velocity: Throw the superball with an initial velocity ~v directed opposite to the desired final direction of motion. By throwing it with a velocity that cancels out the eventual rebound velocity, you set the stage for the ball to reverse its path upon impact.
2. Angular Rotation Frequency: To ensure that the superball has the desired angular rotation frequency ~ω around its center of mass, apply a spin to the ball as you throw it. The direction and magnitude of the spin will depend on the desired rotation frequency. This spin should be in a direction such that when the ball strikes the ground, it will experience a rotational force that will reverse its spin and cause it to rotate in the opposite direction.
By combining the appropriate initial velocity and angular rotation frequency, you can throw the superball in a way that it strikes the ground with the desired velocity ~v and angular rotation frequency ~ω, allowing it to reverse its path upon impact. Experimentation and practice may be necessary to achieve the desired outcome.
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While on safari, you see a cheetah 10 m away from you. The cheetah starts running at t= 0. As it runs in a straight line away from you, its displacement can be described as x(t) = 10 m+ (5.0 m/s2)ť. (a) Draw a graph of the cheetah's displacement vs. time. х t (b) What is the average velocity of the cheetah during the first 4 seconds of its run? (c) What is the average velocity of the cheetah from t = 4.9 s to t= 5.1 s? (d) What is the instantaneous velocity of the cheetah at any time t? In other words, what is v(t)? (e) How does your answer for (C) compare to the instantaneous velocity at t= 5.0 s?
(a) The cheetah's displacement vs. time, the equation is x(t) = 10 m + [tex](5.0 m/s^2[/tex])t. (b) The average velocity during the first 4 seconds can be calculated by finding the change in displacement (Δx) divided by the change in time (Δt). (c) The average velocity from t = 4.9 s to t = 5.1 s can be calculated in the same way. Δx = x(5.1 s) - x(4.9 s) and Δt = 5.1 s - 4.9 s.
(d) The instantaneous velocity, v(t), at any time t can be found by taking the derivative of the displacement function x(t) with respect to time. In this case, v(t) = dx(t)/dt = d/dt (10 m + ([tex]5.0 m/s^2[/tex])t). (e) To compare the average velocity at t = 5.0 s to the instantaneous velocity, we can calculate the instantaneous velocity at t = 5.0 s .
(a) The displacement vs. time graph of the cheetah will be a straight line with a positive slope of [tex]5.0 m/s^2[/tex] The initial displacement at t = 0 s is 10 m, and the displacement increases linearly with time due to the constant acceleration of [tex]5.0 m/s^2[/tex].
(b) To find the average velocity during the first 4 seconds, we need to calculate the change in displacement (Δx) during that time interval and divide it by the change in time (Δt). This gives us the average rate of change of displacement, which is the average velocity. By substituting the values into the formula, we can find the average velocity during the first 4 seconds.
(c) Similarly, to find the average velocity from t = 4.9 s to t = 5.1 s, we calculate the change in displacement (Δx) during that time interval and divide it by the change in time (Δt). This gives us the average velocity during that specific time interval.
(d) The instantaneous velocity at any time t can be found by taking the derivative of the displacement function with respect to time. In this case, we differentiate x(t) = 10 m + ([tex]5.0 m/s^2[/tex])t with respect to t, giving us the instantaneous velocity function v(t) = [tex]5.0 m/s^2[/tex].
(e) To compare the average velocity at t = 5.0 s to the instantaneous velocity, we substitute t = 5.0 s into the instantaneous velocity function obtained in part (d). By comparing this value to the average velocity calculated in part (c), we can determine how they differ or coincide.
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A block of a clear, glass-ike material sits on a table surrounded by normal air (you may assume r=1.00 in air). A beam of light is incident on the block at an angle of 40.8 degrees. Within the block, the beam is observed to be at an angle of 22 8 degrees from the normal. What is the speed of light in this material? The answer appropriately rounded, will be in the form (X)x 10 m/s. Enter the number (X) rounded to two decimal places
The speed of light in a material can be determined using the relation:
n1 sin(θ1) = n2 sin(θ2),
where n1 = 1 in air (since it is given that r = 1.00 in air) and θ1 = 40.8 degrees (the angle of incidence).
The angle of refraction, θ2, is given as 22.8 degrees.
To find the refractive index, n2, we use:
n2 = n1 sin(θ1)/ sin(θ2)
n2 = sin(40.8)/sin(22.8)
= 1.6 (rounded to one decimal place)
The speed of light in the material can be found using:
v = c/n2, where c is the speed of light in vacuum
v = c/1.6 = 1.875x10^8 m/s (rounded to two decimal places)
Therefore, the speed of light in the material is 1.88 x 10^8 m/s (rounded to two decimal places).
Answer: 1.88
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Three point charges q1=–4.63 µC, q2=5.43 µC and q_3 are position on the vertices of a square whose side length is 7.61 cm at point a, b, and c, respectively as shown in the figure below. The electric potential energy associated to the third charge q3 is 1.38 J. What is the charge carried by q3?
Therefore, the charge carried by q3 is 341 µC or -341 µC (since we don't know its sign).Answer: The charge carried by q3 is 341 µC.
We are given the side length of the square as 7.61 cm. Let's consider the position vector of q3 from q1. Its direction is along the diagonal of the square, and its magnitude can be calculated using Pythagoras theorem.
The distance of q3 from q1 is given by the hypotenuse of an isosceles right-angled triangle with legs of length 7.61 cm. Therefore, the distance from q1 to q3 is:r = √(7.61² + 7.61²) = 10.75 cmNext, let's calculate the electric potential energy between q1 and q3. Using the formula for electric potential energy of a pair of point charges:U = (k * |q1| * |q3|) / r
where k = 9 x 10^9 Nm²/C² is Coulomb's constant. We know U = 1.38 J, |q1| = 4.63 µC, and r = 10.75 cm. Substituting these values and solving for |q3|:|q3| = (U * r) / (k * |q1|) = (1.38 J * 10.75 cm) / (9 x 10^9 Nm²/C² * 4.63 µC)= 0.000341 C = 341 µC
Therefore, the charge carried by q3 is 341 µC or -341 µC (since we don't know its sign).Answer: The charge carried by q3 is 341 µC.
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