False, Fiber optic cable is thinner and lighter than unshielded twisted pair (UTP) cable.
Fiber optic cables are made up of strands of glass or plastic fibers that transmit data through light pulses. They are immune to electromagnetic interference and can transmit signals over longer distances than UTP cables, which are made up of copper wires.The content loaded Fiber optic cable is used in high-speed internet connections because it can transmit large amounts of data at very high speeds. Additionally, fiber optic cables are more secure than UTP cables because they are much more difficult to tap into without being detected. Therefore, the statement that fiber optic cable is thicker and heavier than UTP cable is false.
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A planet whose mass is half of the mass of Earth and radius equal to the radius of the Earth, the acceleration due to gravity on the surface of the planet would be-
A planet whose mass is half of the mass of Earth and radius equal to the radius of the Earth, the acceleration due to gravity on the surface of the planet would be 19.6m/s².
Large, circular celestial objects that are neither stars nor their remnants are known as planets. The nebular hypothesis, which states that an interstellar cloud collapses out of a nebula to create a young protostar orbited by a protoplanetary disc, is currently the best theory for planet formation. The formula for the acceleration caused by gravity on earth's surface is,
g = GM/R
Now, Mp = M/2
Rp = R/2
The planet's gravitational acceleration is,
gp = GMp/Rp
gp = (GM/2)/(R²/4) = 2g
gp = 2 × 9.8 = 19.6m/s²
Therefore, the acceleration due to gravity on the surface of the planet will be 19.6m/s².
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assume ω = 13.0 rad/s . what is the magnitude v of the velocity of the particle in m/s ?
Given Angular velocity ω = 13.0 rad/s, magnitude v of the velocity of the particle in m/s = 13 m/s.
Explanation:
The formula used to calculate the linear velocity of a particle that is rotating at a distance from a fixed point at an angular velocity of ω radians per second is given as, v = r * ω.
Where, v = Linear velocity of a particle that is rotating at a distance r from a fixed point, r = Distance from the fixed point, ω = Angular velocity of the particle. Substituting the given values in the formula, v = r * ω= 1 * 13= 13 m/s. Therefore, the magnitude v of the velocity of the particle in m/s is 13 m/s.
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A student moves a 222.0 newton table by lifting it above their head in
7.0 seconds, the student is 2 meters tall. How many joules of work did
the student do?
Work = 222 cm x 2. The joule 444(J), sometimes known as the newton metre (N m), is the Si derived unit for work. The work required to move an item 2 metres with 1 N much force is measured in joules.
How much work does one joule equal?The work performed by a force from one newton acting via one metre is equivalent to one joule, a unit of work of energy in the Internacional System of Units (SI). Its name honours English physicist William Prescott Joule and its equivalent in ergs is 107, or around 0.7377 foot-pounds.
How many newtons is one joule?The work (or heat expended) by the a force with one newton (N) operating more than a distance of 1 m is equivalent to one joule (m). A force of one newton causes a mass of one kilogramme (kg) to accelerate by one m per second (s) every second. Thus, one joule is equivalent to one newton metre.
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what is the horizontal distance of the center of gravity of the person-ladder system from the point where the ladder touches the ground? express your answer with the appropriate units.
The person-ladder system's centre of gravity is located 0.3 metres horizontally from the point where the ladder hits the ground.
What is the centre of gravity exactly?The average position of an object's weight is known as its centre of gravity. Any object's travel through space may be entirely explained in terms of how its centre of gravity moves from one location to another.
According to the principle of moments, the total of the clockwise and anticlockwise moments is equal. In this instance, we could type:
[tex]W1 * d1 = (W1 + W2) * x[/tex]
We know that the total of the vertical forces acting on the ladder and the person is zero since they are both in equilibrium. Hence, we may write:
W1 + W2 = F
where F is the system's weight multiplied by the vertical force exerted on the ladder-person arrangement.
The two equations together give us:
W1 * d1 = F * x
Solving for x, we get:
x = (W1 * d1) / F
W1 = 200 N
W2 = 600 N
F = W1 + W2 = 800 N
we can see that d1 = 1.2 m and d3 = 0.8 m. Therefore:
x = (W1 * d1) / F = (200 N * 1.2 m) / 800 N = 0.3 m
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The center of gravity for the person-ladder system is 0.3 meters away from where the ladder touches the ground.
The sum of the clockwise and anticlockwise moments is equal, as per the moments' principle.
W1 × d1 = (W1 + W2)
Since the ladder and the person are both in equilibrium, we know that the sum of the vertical forces acting on them is zero. So, we may say:
W1 + W2 = F
Where F is the system's weight multiplied by the vertical force exerted on the ladder-person arrangement.
The two equations together give us:
W1 × d1 = F × x
Solving for x, we get:
x = (W1 × d1) / F
W1 = 200 N
W2 = 600 N
F = W1 + W2 = 800 N
d1 = 1.2 m and d3 = 0.8 m.
Therefore:
x = (W1 × d1) / F
= (200 N × 1.2 m) / 800 N
Distance = 0.3 m
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A motor moves a belt that is attach to an axle of a solid flywheel. The radius of the axle r = 3.25 cm and the radius of the larger solid flywheel is R = 27.4 cm. What is the tangential velocity of the outer edge of the fly wheel assuming the belt has linear velocity of 45.0 m/s?
Explanation:
We can start by using the fact that the linear velocity of the belt is equal to the tangential velocity of the flywheel at the point where the belt contacts it. We can use this to find the tangential velocity of the outer edge of the flywheel using the ratio of the radii.
Let's call the tangential velocity of the outer edge of the flywheel "v". Then we have:
v / 45.0 m/s = R / r
where R is the radius of the flywheel and r is the radius of the axle. We can rearrange this to solve for v:
v = (45.0 m/s) * (R / r)
Substituting in the given values for R and r, we get:
v = (45.0 m/s) * (27.4 cm / 3.25 cm)
Converting the radius to meters:
v = (45.0 m/s) * (0.274 m / 0.0325 m)
Simplifying:
v = 379.6 m/s
Therefore, the tangential velocity of the outer edge of the flywheel is approximately 379.6 m/s
Two balls, each with a mass of 0. 5 kg, collide on a pool table. Is the law of conservation of momentum satisfied in this collision? Explain why or why not
In the given collision scenario, the law of conservation of momentum is not satisfied, indicating the idealized nature of perfectly elastic collisions.
To determine whether the law of conservation of momentum is satisfied in this collision, we need to calculate the total momentum of the system before and after the collision and see if they are equal.
If we assume that the two balls are moving in opposite directions with the same speed, then their momenta before the collision are:
p₁ = m₁v₁ = (0.5 kg)(v) and p₂ = m₂v₂ = -(0.5 kg)(v)
where v is the speed of the balls, and the negative sign for p₂ indicates that it is in the opposite direction.
The total momentum before the collision is:
p_before = p₁ + p₂ = (0.5 kg)(v) - (0.5 kg)(v) = 0
This means that the total momentum of the system before the collision is zero.
After the collision, the two balls will stick together and move with a common speed. Let's assume that their final speed is v_f.
The total momentum after the collision is:
p_after = (m₁ + m₂)*v_f = (0.5 kg + 0.5 kg)v_f = 1 kgv_f
Since the two balls stick together and move with a common speed, the momentum is conserved and the total momentum after the collision is equal to the total momentum before the collision:
p_before = p_after = 0 = 1 kg*v_f
This is a contradiction, as there is no value of v_f that satisfies this equation. Therefore, the law of conservation of momentum is not satisfied in this collision.
In reality, the collision between the two balls would not be perfectly elastic, and some energy would be lost to friction and other factors. This would result in a partial loss of momentum, and the law of conservation of momentum would be approximately satisfied, but not exactly.
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if a 100.0 g object needs 1145 joule to increase temperature by 10.0 what's it's specific heat capacity
The specific heat capacity of the object is 1.145 J/(g°C)
The specific heat capacity of the object can be calculated using the formula:
specific heat capacity = (energy required)/(mass x change in temperature)
In this case, the energy required to increase the temperature of the object by 10.0 degrees Celsius is 1145 J, the mass of the object is 100.0 g, and the change in temperature is 10.0 degrees Celsius.
specific heat capacity = (1145 J)/(100.0 g x 10.0 °C)
specific heat capacity = 1.145 J/(g°C)
Therefore, the specific heat capacity of the object is 1.145 J/(g°C). This means that it takes 1.145 joules of energy to raise the temperature of 1 gram of the object by 1 degree Celsius.
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Electron diffraction
21.
a) The table below shows four statements that may or may not be true about the wave nature
of the electron. Place a tick next to the statement if it is correct and cross if it is incorrect.
Electron can be diffracted by matter. This confirms their wave nature.
The wavelength of the electron is given by the de Broglie equation
The wave associated with a moving electron is an electromagnetic wave
The kinetic energy of the electron is given by the equation E = hf
b) Calculate the speed of a carbon atom of mass 2.0 x 10-26 kg travelling in space with a de
Broglie wavelength of 6.8 x 10-26 m.
a) The correct statements are: Electron can be diffracted by matter. This confirms their wave nature.
The wavelength of the electron is given by the de Broglie equation.
The incorrect statements are:
The wave associated with a moving electron is an electromagnetic wave.
The kinetic energy of the electron is given by the equation E = hf.
b) The de Broglie wavelength of a particle is given by the equation:
λ = h / p
where λ is the wavelength, h is Planck’s constant, and p is the momentum of the particle. The momentum of the carbon atom is given by:
p = mv
where m is the mass of the carbon atom and v is its velocity. Substituting the given values, we get:
p = (2.0 x 10⁻²⁶kg) v
λ = h / p
λ = h / (2.0 x 10⁻²⁶ kg) v
Substituting the given value of λ, we get:
6.8 x 10⁻²⁶ m = (6.626 x 10⁻³⁴ J s) / (2.0 x 10⁻²⁶kg) v
Solving for v, we get:
v = (6.626 x 10⁻³⁴ J s) / (2.0 x 10⁻²⁶ kg) (6.8 x 10⁻²⁶ m)
v = 1.62 x 10³ m/s
Therefore, the speed of the carbon atom is 1.62 x 10³ m/s.
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object a is a conductor. it is neutral. it is touched by a negatively-charged, conducting sphere. when the sphere is pulled away, what charge does object a have?
Object A will have a negative charge when it is touched by a negatively charged, conducting sphere.
We need to first understand the properties of conductors and charges.
What is a conductor?A conductor is a material that allows electric charges to flow freely through it. In other words, it has low resistance to electric current. Most metals, such as copper and aluminum, are good conductors.
What is a charge?An electric charge is a fundamental property of matter. It is an electrical property of the atomic particles (such as electrons and protons) that make up matter. Charges can be either positive or negative.
What happens when a conductor is touched by a charged object?When a charged object touches a conductor, the charge spreads out evenly over the surface of the conductor. This is called electrostatic induction. If the conductor is neutral, it will become charged. If the conductor is already charged, the charge will distribute itself evenly over the conductor's surface.
This happens because charges of the same type repel each other and charges of the opposite type attract each other. When the charged object is pulled away, the charge on the conductor remains.
What charge does object a have?In this scenario, object A is a neutral conductor. When it is touched by a negatively charged sphere, the negative charge spreads out evenly over the surface of the conductor. This means that object A becomes negatively charged. When the sphere is pulled away, the negative charge on object A remains.
Therefore, the charge on object A is negative.
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an empty parallel plate capacitor is connected between the terminals of a 6.33-v battery and charges up. the capacitor is then disconnected from the battery, and the spacing between the capacitor plates is doubled. as a result of this change, what is the new voltage between the plates of the capacitor?
The new voltage between the plates of the capacitor in the terminals of a 6.33-V battery is 6.33-V.
The voltage between the plates of the capacitor will remain the same after the spacing between the plates is doubled. This is because the voltage of a capacitor is determined solely by the amount of charge stored in the capacitor. Increasing the spacing between the plates does not change the charge stored on the capacitor, so the voltage between the plates stays the same.
In this case, the new voltage between the plates of the capacitor would remain at 6.33-V.
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a 5.0 gram piano wire spans 44.0 cm. to what tension must this wire be stretched to ensure that its fundamental mode vibrates at the d4 note (f = 293.7 hz)? (enter your answer in in n.)
Tension required to make the 5.0 gram piano wire vibrate at the D4 note is approximately 268,679.21 N.
Let's discuss it further below.
To find the tension required to make a 5.0 gram piano wire with a length of 44.0 cm vibrate at the D4 note (f = 293.7 Hz), follow these steps:
1. Convert the given mass and length to SI units.
Mass (m) = 5.0 g = 0.005 kg
Length (L) = 44.0 cm = 0.44 m
2. Use the formula for the fundamental frequency of a vibrating string:
f = (1/2L) * sqrt(T/μ), where T is the tension and μ is the linear mass density.
3. Calculate the linear mass density (μ) using the given mass and length:
μ = m / L = 0.005 kg / 0.44 m = 0.01136 kg/m
4. Rearrange the formula for the fundamental frequency to solve for tension (T):
T = (2L * f)² * μ
5. Plug in the values and calculate the tension:
T = (2 * 0.44 m * 293.7 Hz)² * 0.01136 kg/m
T = (517.968)² * 0.01136 kg/m
T = 268679.21 N
Therefore, the tension required to make the 5.0 gram piano wire vibrate at the D4 note is approximately 268,679.21 N.
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a newly discovered star is 2.33 times brighter when measured using a u filter than when using a b filter. what is the star's (u-b) color? a newly discovered star is 2.33 times brighter when measured using a u filter than when using a b filter. what is the star's (u-b) color?
The star's (u-b) color can be calculated by taking the logarithm base 10 of the brightness ratio between the u and b filters, which yields a value of 0.63 magnitudes. Therefore, the star has a blue color.
The newly discovered star in this instance is revealed to be 2.33 times brighter when measured with the u filter than with the b filter. This ratio's logarithm in base 10 gives us log(2.33) = 0.37. The (u-b) colour index is 0.63 magnitudes since we are interested in the magnitude difference between the u and b filters, thus we must multiply this number by a factor of 1.7. This number being positive leads us to the conclusion that the star is blue. We cannot, however, draw any firm conclusions about the size, age, or makeup of the star without knowing more about its absolute brightness or other features.
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when a particle is located a distance meters from the origin, a force of newtons acts on it. find the work done in moving the particle from to . find the work done in moving the particle from to . find the work done in moving the particle from to .
When a particle is located a distance 2 meters from the origin, a force of 4 newtons acts on it.
The work done in moving the particle from A to B is 16J
The work done in moving the particle from B to C is -8J
The work done in moving the particle from C to D is 8J
Force F = 4N
Displacement dx = 2m
Total displacement of the particle from point A to B is dAB = 4m.
Work done is given by: W = F.dx (cosθ)
Where,θ is the angle between the force and displacement.
1. Work done in moving the particle from A to B:
Let the particle is located at point A (x = 0). The force F acts in the positive direction of the x-axis. Therefore, the angle between the force and displacement is 0°.The work done in moving the particle from point A to B is
WAB = F(dx) cosθ
= (4 N)(4m) cos 0°
= (4 N)(4m)
= 16 J
2. Work done in moving the particle from B to C:
The displacement of the particle from B to C is dBC = 2m.
Therefore, the total displacement of the particle from point A to C is
dAC = dAB + dBC
=4m + 2m = 6m.
The force F acts in the negative direction of the x-axis. Therefore, the angle between the force and displacement is 180°.The work done in moving the particle from point B to C is
WBC = F(dx) cosθ
= (4 N)(2m) cos 180°
= (4 N)(-2m)
= -8 J
Note: Here, cos 180° = -1.
3. Work done in moving the particle from C to D:
Let the particle is located at point D (x = 6m).
The force F acts in the positive direction of the x-axis. Therefore, the angle between the force and displacement is 0°.
The work done in moving the particle from point C to D is WCD = F(dx) cosθ
= (4 N)(2m) cos0°
= (4 N)(2m)
=8J
Therefore, the work done in moving the particle from A to B is 16 J, the work done in moving the particle from B to C is -8 J, and the work done in moving the particle from C to D is 8 J.
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As you found in Part A, your weight will be greater than normal when the elevator is moving upward with increasing speed. For what other motion would your weight also be greater than your normal weight?
The elevator moves downward while slowing in speed.
In the other motion, your weight also be greater than your normal weight if the elevator moves downward while slowing in speed, then the weight of the person would also be greater than the normal weight.
What is the normal force of an object?The normаl force is the perpendiculаr force thаt opposes the weight of аn object in contаct with а surfаce. The normаl force equаls the object's weight only in situаtions where the object is directly on а horizontаl surfаce or the incline аngle is 0 degrees.
The force exerted by аn object perpendiculаr to а surfаce thаt prevents the object from sinking into the surfаce is referred to аs the normаl force. When аn object is plаced on а surfаce, the surfаce responds by exerting а force thаt is perpendiculаr to the object's weight. Аnother motion thаt would аlso result in your weight being greаter thаn your normаl weight is when the elevаtor moves downwаrd while slowing in speed. This occurs due to the аccelerаtion of the person within the elevаtor.
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What is initial velocity of a ball (m/s) which is thrown upwards and takes 15.0s to return to its starting position?
A. 73.6 m/s
B. 73.6 m/s^2
C. 25 m/s^2
D. 25 m/s
The initial velocity of the ball is approximately 73.65 m/s. So, the correct option is A. 73.6 m/s.
A particle travelling in a straight line has its acceleration plotted against time on an acceleration-time graph.
To solve this problem, we need to use the formula for the displacement of an object under constant acceleration:
Δy = v₀t + 1/2at²
where:
Δy = 0 (because the ball returns to its starting position)
v₀ = initial velocity (what we're trying to find)
t = 15.0 s (the time it takes for the ball to return to its starting position)
a = acceleration due to gravity (approximately -9.81 m/s², assuming the ball is thrown on Earth)
Plugging in these values, we get:
0 = v₀(15.0 s) + 1/2(-9.81 m/s²)(15.0 s)²
Simplifying:
0 = 15.0v₀ - 1104.75
Solving for v₀:
v₀ = 1104.75/15.0
v₀ ≈ 73.65 m/s
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identify the equation that relates the wave period and wavelength.
Answer:
The equation that relates the wave period and wavelength is:
wave speed = wavelength / wave period
Explanation:
The equation that relates the wave period (T) and wavelength (λ) is v = λ / T, Where v represents the velocity of the wave.
The wave period (T) is the time it takes for one complete cycle of a wave to pass a given point. It is measured in seconds (s) and represents the time taken for a wave to repeat its pattern.
The wavelength (λ) is the distance between two corresponding points on a wave, usually measured from crest to crest or trough to trough. It is denoted in units of length, such as meters (m) or centimeters (cm). The wavelength determines the spatial extent of a wave's repeating pattern.
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what physics factor contributes to the accuracy of a fired bullet
Answer:
The bullet accuracy is influenced by a combination of factors, including bullet spin, shape, design, muzzle velocity, air resistance, and the shooter's skill and technique.
Explanation:
Several physics factors contribute to the accuracy of a fired bullet, but one of the most important factors is the bullet's stability in flight. This stability is primarily determined by the following aspects:
Bullet spin: When a bullet is fired, it is spun by the rifling (spiral grooves) inside the barrel of the gun. This spin imparts a gyroscopic stability to the bullet, helping it maintain a stable and consistent trajectory in flight.
Bullet shape and design: The shape and design of the bullet also play a significant role in its accuracy. Aerodynamic bullets with a streamlined shape are more stable in flight, as they reduce air resistance and minimize the effects of crosswinds.
Muzzle velocity: The speed at which the bullet leaves the barrel, known as muzzle velocity, can also impact accuracy. Higher muzzle velocities generally lead to flatter trajectories, which can make it easier to hit targets at longer distances. However, too high a muzzle velocity may cause instability and reduced accuracy.
Air resistance and drag: As the bullet travels through the air, it experiences air resistance and drag, which can cause it to slow down, lose stability, and deviate from its intended path. Factors such as altitude, humidity, and wind can influence air resistance and, consequently, bullet accuracy.
Shooter's skill and technique: The skill and technique of the person firing the bullet also play a crucial role in the accuracy of a fired bullet. Proper trigger control, sight alignment, and breath control can significantly impact the accuracy of the shot.
The physics factor that contributes to the accuracy of a fired bullet is its stability in flight, which depends on several factors including its velocity, spin, and shape.
What is the difference between velocity and spin?Velocity and spin are two different concepts that are related to the motion of an object.
Velocity refers to the rate at which an object changes its position in a particular direction over time. In other words, velocity is a vector quantity that has both magnitude (speed) and direction, and it is often expressed in units of meters per second (m/s) or kilometers per hour (km/h). Velocity can be positive or negative, depending on the direction of the object's motion.
Spin, on the other hand, refers to the rotation of an object around its axis. When an object spins, it rotates around a fixed point or axis, and it can have a variety of different spin rates or angular velocities. Spin is often measured in units of revolutions per minute (RPM) or radians per second (rad/s).
In some cases, velocity and spin can be related. For example, in sports like baseball, the spin of a ball can affect its trajectory and the way it moves through the air. A baseball pitcher can throw a pitch with backspin or topspin, which will cause the ball to curve or drop in a particular way as it travels towards the batter. In this case, the spin of the ball can be used to control its velocity and direction, and to deceive the opposing team.
Here in the Question,
The velocity of the bullet, or its speed, is important for accuracy because it determines the distance that the bullet will travel in a given amount of time. A faster bullet will cover more distance in a shorter amount of time, which can make it more difficult to aim accurately. On the other hand, a bullet that is too slow may not have enough momentum to travel a long distance or penetrate a target effectively.
The spin of the bullet is also crucial for stability in flight. Most bullets are designed with a spiral groove pattern on the inside of the barrel, which causes the bullet to spin as it travels through the air. This spin stabilizes the bullet by causing it to rotate around its longitudinal axis, which helps to counteract any irregularities or disturbances in the air. A bullet that is not spinning or is spinning too slowly can be more prone to wobbling or tumbling in flight, which can reduce accuracy.
Finally, the shape of the bullet can also affect its stability in flight. Bullets that are streamlined and have a high ballistic coefficient, or resistance to air resistance, will maintain their velocity and trajectory better than bullets with a more irregular shape. Additionally, a bullet that is too long or too short for its caliber can be unstable in flight and can affect accuracy.
Therefore, the accuracy of a fired bullet depends on a combination of factors, including its velocity, spin, and shape, which must be carefully optimized to ensure consistent and reliable performance.
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a 92 kg man lying on a surface of negligible friction shoves a 75 g stone away from himself, giving it a speed of 4.0 m/s. what speed does the man acquire as a result?
The required speed of the man when mass and speed of the stone are specified is calculated to be 0.00326 m/s.
Mass of the man is given as M = 92 kg.
Mass of the stone is given as m = 75 g = 0.075 kg.
Speed of the stone is given as u = 4 m/s.
Speed of the man is to be found out, v = ?
Using the conservation of momentum, we have,
The initial velocities of the man and the stone is zero(V).
So, mathematically,
(M+m)V = M v + m u
(M+m) × 0 = 92 × v + 0.075 × 4
92 × v + 0.3 = 0
92 v = - 0.3
v = - 0.00326 m/s
Thus, the speed of the man is calculated to be 0.00326 m/s.
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A softball has kinetic energy of 81 j as it flies across home plate at a velocity of 30 m/s. calculate the mass of the softball.
A softball weighs 0.18427 kg. Its average rebound height on concrete, grass, and wood is 80.8 cm, 75.3 cm, or 87.6 cm, respectively. Kinetic energy 81 multiplied by a speed of 30 m/s and mass equals 2430.
What is mass, for instance?The amount of matter inside an item is referred to as mass in mathematics. The most common way to determine mass is to weigh something. Anything will weigh more the more matter it contains. For instance, a mouse will have a higher mass than an ant since it contains more stuff.
Of what mass?The quantity of substance contained within an item is expressed in terms of mass. Typically, mass is expressed in kilogrammes (kg) or grammes (g) (kg). No matter where in the cosmos it is or how much gravitational force is exerted on it, mass is a measure of how much matter there is.
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What is responsible for the weather changes on Earth?
Answer: Geological records show that there have been a number of large variations in the Earth's climate. These have been caused by many natural factors, including changes in the sun, emissions from volcanoes, variations in Earth's orbit and levels of carbon dioxide (CO2).
For a shorter answer: changes in the sun, emissions from volcanoes, variations in Earth's orbit and levels of carbon dioxide (CO2).
Given that the population standard deviation is 6.8, what sample size is required to be 90%
confident that the estimated mean has an error less than 0.02?
The sample size required to be 90% confident that the estimated mean has an error less than 0.02 is 5534.
The formula used to calculate the required sample size is given by:
n = ((zα/2 × σ) / E)²
where:
n = sample size
zα/2 = z-value for the level of confidence (α/2
)σ = population standard deviation
E = maximum error
Population standard deviation, σ = 6.8
Maximum error, E = 0.02
Confidence level, α = 0.9
Therefore, α/2 = 0.45 (since the confidence interval is symmetric)
The z-value for 0.45 level of confidence is 1.645.
Thus:
n = ((1.645 × 6.8) / 0.02)²
n = (11.066 / 0.02)²
n = 5533.0256
Rounding up, the required sample size is n = 5534.
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a spherical shell and a solid sphere (both of the same total mass) are rotating about a diameter at the same angular frequency and with the same rotational kinetic energy. what is the ratio of the spherical shell radius to the solid sphere (i.e., rspherical shell/rsolid sphere)?
Answer:
I (shell) = 2/3 M R^2
I(sphere) = 2/5 M R^2
I(shell) / I(sphere) = (2/3) / (2/5) = 5/3
R(shell) / R(sphere) = (5/3)^1/2 = (15)^1/2 / 3
How is communication important in a science experiment?
(simple but detailed answer)
In order to ensure that everyone on the team is aware of the goals, rules, and steps involved in the science experiment, communication is crucial. It permits the transparent exchange of information and thoughts.
Why is dialogue crucial in experiments?The chance to get input from stakeholders, experts, and other people with a professional or academic interest in the topic is provided by the presentation of your research findings.
Why is dialogue a crucial component of the science process?Science gains support, understanding of its broader relevance to society is promoted, and it encourages more informed decision-making at all levels, from government to communities to individuals, when scientists are able to effectively communicate outside of their peer group.
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what should one do to apply maximum pushing force? 1) use the largest possible number of segments 2) use the smallest segments 3) move through a large range of motion 4) move the segments in an ordered sequence, one after the other 2, 4 1, 3 1, 2, 3 1, 3, 4
1) To apply maximum pushing force, use the largest possible number of segments and move through a large range of motion.
2) Additionally, move the segments in an ordered sequence, one after the other, to ensure maximum pushing force.
3) For example, the sequence could be 1, 3, 2, 4.
To apply maximum pushing force, one should move through a large range of motion.
Maximum pushing force refers to the amount of force that a person can exert on an object when pushing it. The amount of maximum pushing force that a person can apply is dependent on various factors such as the strength of their muscles, the weight of the object being pushed, and the range of motion.
What should one do to apply maximum pushing force?To apply maximum pushing force, one should move through a large range of motion. Moving through a large range of motion helps to recruit a larger number of muscle fibers which in turn helps to generate more force. Therefore, option 3 is the correct answer. Option 1 is incorrect because using the largest possible number of segments does not necessarily translate to more force. Option 2 is also incorrect because using the smallest segments may not result in more force. Option 4 is incorrect because moving the segments in an ordered sequence, one after the other does not always translate to more force.
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a 70-cm-diameter wheel rotating at 1200 rpm is brought to rest in 15 s. calculate its angular acceleration
The angular acceleration is -1.33 revolutions per second.
The angular acceleration can be calculated using the following formula:
Angular acceleration (α) = (Final angular velocity - Initial angular velocity) / Time
Initial angular velocity = 1200 revolutions per minute (rpm) = 20 revolutions per second (rps)
Final angular velocity = 0 revolutions per second (rps)
Time = 15 seconds
Angular acceleration (α) = (0 - 20) / 15 = -1.33 revolutions per second squared (rps2)
Moreover, the temporal rate at which angular velocity changes is known as angular acceleration. The standard unit of measurement is radians per second per second. Therefore, = d d t. Rotational acceleration is another name for angular acceleration. A rigid body's points all share the rotating velocity and acceleration. Here, The rotation is in the clockwise direction and the angular acceleration is negative.
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Use a 10mH inductor to design a low-pass passive filter with a cutoff frequency of 1600rad/s. a) Specify the cutoff frequency in hertz. b) Specify the value of the filter resistor. c) Assume the cutoff frequency cannot decrease by more than 10%. What is the smallest value of load resistance that can be connected across the output terminals of the filter? d) If the resistor found in (c) is connected across the output terminals, what is the magnitude of H(jω) when ω=0 ?
Use a 10mH inductor to design a low-pass passive filter with a cutoff frequency of 1600rad/s.
a) To specify the cutoff frequency in hertz, you can use the formula:
f = ω / 2π
where f is the frequency in hertz, and ω is the frequency in radians per second.
Given the cutoff frequency of 1600 rad/s, you can calculate the frequency in hertz as follows:
f = 1600 / (2 * π) ≈ 254.65 Hz
b) To specify the value of the filter resistor, use the formula:
R = 1 / (ω * L)
where R is the resistor value, ω is the cutoff frequency in rad/s, and L is the inductor value.
Given the cutoff frequency of 1600 rad/s and an inductor value of 10mH (0.01 H), the resistor value can be calculated as follows:
R = 1 / (1600 * 0.01) ≈ 0.0625 Ω
c) To find the smallest value of load resistance that can be connected across the output terminals of the filter without decreasing the cutoff frequency by more than 10%, you can use the following formula:
R_ load_ min = R / ((1 - 0.9) * (1 + 0.9))
Given the resistor value calculated in (b) is 0.0625 Ω:
R_ load_ min = 0.0625 / ((1 - 0.9) * (1 + 0.9)) ≈ 3.125 Ω
d) If the resistor found in (c) is connected across the output terminals, the magnitude of H(jω) when ω=0 can be calculated using the formula:
H(jω) = R_ load / (R + R_ load)
Given the resistor values calculated in (b) and (c):
H(jω) = 3.125 / (0.0625 + 3.125) ≈ 0.9804
So, the magnitude of H(jω) when ω=0 is approximately 0.9804.
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4. how many kwh of energy could be generated by a coal burning power plant that burned 250 tons of coal and was 40% efficient?
A coal-burning power station that burned 250 tonnes of coal and also was 40% efficient could produce 7.3E5 kWh of energy. 0.89 kWh/pound for coal. 0.14 kWh/cubic foot for natural gas.
How is one kWh produced?A power over 1 kW in use for 1 hour is equal to 1 kWh, as are powers of 05 kW used for two h, 2 kW used for 05 hours, etc. 1 k W h is equal to 1 kilowatt multiplied by 1 hour, 1000 watts, 3600 seconds, or 3,600,000 watt-seconds, or joules.
1 kilogramme of coal equals how many kWh?The calorific value for hard coal, which varies depending on the type, is somewhere between 29.3 MJ/kg (fuel coal) and 33.5 MJ/kg. One kilogramme of coal is equal to 7,000 kilocalories (7,000 kwh 29.3 MJ 8.141 kWh) (anthracite).
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The coal-burning power plant could generate 667 kWh of energy.
What is Energy?
Energy is the ability to do work, and it comes in many different forms. It can be in the form of mechanical energy, thermal energy, electrical energy, electromagnetic radiation, or nuclear energy, among others. Energy can be converted from one form to another, but it cannot be created or destroyed, only transferred or transformed.
To calculate the energy generated by the coal-burning power plant, we need to use the following formula:
Energy Generated = Efficiency x Energy Content x Amount of Coal Burned
Efficiency is given as 40%, which can be converted to a decimal by dividing by 100:
Efficiency = 40% = 0.40
The energy content of coal varies depending on the type of coal, but a reasonable estimate is around 24 megajoules per kilogram (MJ/kg). To convert this to kilowatt-hours (kWh), we need to divide by 3.6 million (the number of joules in a kWh):
Energy Content = 24 MJ/kg / 3.6 million = 0.00667 kWh/kg
The amount of coal burned is given as 250 tons, which can be converted to kilograms by multiplying by 1000:
Amount of Coal Burned = 250 tons x 1000 kg/ton = 250,000 kg
Now we can substitute these values into the formula:
Energy Generated = 0.40 x 0.00667 kWh/kg x 250,000 kg
Energy Generated = 667 kWh
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a tank, shaped like a cone has height meter and base radius meter. it is placed so that the circular part is upward. it is full of water, and we have to pump it all out by a pipe that is always leveled at the surface of the water. assume that a cubic meter of water weighs , i.e. the density of water is . how much work does it require to pump all water out of the tank? enter the exact value of your answer.
The work required to pump all the water out of the tank is [tex](1000/3)\pi g[/tex] J.
The volume of a cone can be calculated using the formula:
[tex]V = (1/3)\pi r^2h[/tex]
where r is the base radius, h is the height, and π is the mathematical constant pi.
Assuming the base radius of the cone is 1 meter and the height is 1 m.
In this case, the tank is full of water, so its volume is:
[tex]V = (1/3)\pi (1^2)(1) = (1/3)\pi[/tex]
The mass of the water in the tank is its volume times its density:
[tex]m = V\rho = (1/3)\pi (1000) = (1000/3)\pi[/tex]
To pump out the water, we need to lift it to the top of the tank, which has a height of 2 meters. So the work required is:
[tex]W = mgh = (1000/3)\pi g\ J[/tex]
Where g is the acceleration due to gravity.
Therefore, it requires approximately [tex](1000/3)\pi g[/tex] Joules of work to pump all the water out of the tank.
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a man is marooned at rest on level frictionless ice. in desperation, he hurls his shoe to the right at 15m/s. if the man weighs 720n and the shoe weighs 4.0n, the man moves to the left with a speed of:a. b. c. d. e. ans: c
The man moves to the left with a speed of 0.084 m/s (or about 8.4 cm/s) after he throws the shoe to the right.
To solve this problem, we need to apply the law of conservation of momentum, which states that the total momentum of a system is conserved if no external forces act on it. In this case, the man and the shoe form a closed system, and their initial momentum is zero because they are at rest. After the man throws the shoe to the right, the system's momentum remains zero, but the man will move to the left to conserve the momentum.
We can use the formula for momentum, which is given by:
[tex]p = m .v[/tex]
Where p is momentum, m is mass, and v is velocity.
Before the man throws the shoe, the total mass of the system is:
[tex]m_{total} = m_{man} + m_{shoe}\\\\m_{total} = \frac{720 N}{9,81 m/s^2} + \frac{4,0 N}{9,81 m/s^2} \\\\m_{total} = 73.4 kg[/tex]
The initial momentum of the system is:
[tex]p_{initial} = m_{total} . 0\\p_{initial} = 0 kg m/s[/tex]
After the man throws the shoe, the shoe's momentum is:
[tex]p_{shoe} = m_{shoe} . v_{shoe}\\\\p_{shoe} = \frac{4,0 N}{9,81 m/s^2}. 15 m/s \\\\p_{shoe} = 6.10 kg m/s[/tex]
To conserve the momentum, the man's momentum must be equal and opposite:
[tex]p_{man} = -p_{shoe}\\p_{man} = -6.10 kg m/s[/tex]
Finally, we can solve for the man's velocity using the formula for momentum:
[tex]p_{man} = m_{man} . v_{man}\\\\v_{man} = \frac{p_{man}}{m_{man}} \\\\v_{man} = \frac{(-6).10 kg m/s}{\frac{720 N}{9,81 m/s^2} } \\\\v_{man} = -0.084 m/s[/tex]
Therefore, the man moves to the left with a speed of 0.084 m/s (or about 8.4 cm/s) after he throws the shoe to the right.
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if an object is being subjected to two forces in the positive y-direction of 20n each, a force in the positive x-y direction of 65n at an angle of 60 degrees with respect to the positive x-axis, and a force in the positive x-direction of 15n. what is the resultant force?
The resultant force of an object being subjected to two forces in the positive y-direction of 20N each, a force in the positive x-y direction of 65N at an angle of 60 degrees with respect to the positive x-axis, and a force in the positive x-direction of 15N is 103.85N.
This can be calculated by the use of vector addition. Vector addition involves combining the vectors mathematically so that the total effect of all the vectors can be seen.
Step 1: Represent each of the forces as vectors. For the two forces in the positive y-direction, these can be represented as Fy1 = 20N and Fy2 = 20N. The force in the positive x-y direction can be represented as Fxy = 65N at an angle of 60 degrees. Lastly, the force in the positive x-direction can be represented as Fx = 15N.
Step 2: Calculate the components of the force in the positive x-y direction. This can be done using trigonometry. The horizontal component is found by multiplying the force by the cosine of the angle. This gives the horizontal component as Fxy,h = 65N x cos60 = 65N x 0.5 = 32.5N. Similarly, the vertical component is found by multiplying the force by the sine of the angle. This gives the vertical component as Fxy,v = 65N x sin60 = 65N x 0.866 = 56.59N.
Step 3: Calculate the resultant force. This can be done by summing the components of each of the forces. For the x-direction, this is simply Fx = 15N + 32.5N = 47.5N. For the y-direction, this is Fy = 20N + 20N + 56.59N = 96.59N.
Step 4: Calculate the magnitude and direction of the resultant force. This can be done using the Pythagorean theorem, since the magnitude is the hypotenuse of a right triangle. The magnitude of the resultant force is thus Fres = √(47.52 + 96.592) = 103.85N. The direction is found by using the inverse tangent of the x and y components. This gives the direction as θ = tan-1(96.59/47.5) = 77.94°.
Therefore, the resultant force of the object being subjected to two forces in the positive y-direction of 20N each, a force in the positive x-y direction of 65N at an angle of 60 degrees with respect to the positive x-axis, and a force in the positive x-direction of 15N is 103.85N at an angle of 77.94° with respect to the positive x-axis.
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