Answer:
Using Coulomb's Law, we know that the force of attraction between two charged objects is directly proportional to the product of their charges and inversely proportional to the square of the distance between them. In this case, we have two charged spheres 5m apart with an attraction of 15.0 x 10^6 N.
a) If both charges are doubled and the distance remains the same , we can calculate the new force of attraction using Coulomb's Law. Doubling the charges means we have a new charge of 2q on each sphere. Plugging in the new values, we get:
F = k * (2q)^2 / (5m)^2 = 4 * (k * q^2 / 5m^2) = 4 * (15.0 x 10^6 N) = 60.0 x 10^6 N.
Therefore, the new force of attraction is 60.0 x 10^6 N.
b) If an uncharged, identical sphere is touched to one of the spheres and then taken far away, the touched sphere will take on the same charge as the original charged sphere. This is because the charges on the two spheres will equalize and redistribute when they touch. The new force of attraction between the two charged spheres will be the same as the original force before the sphere was touched, since the charge on the touched sphere is the same as the original charged sphere. Once the touched sphere is taken far away, it will no longer contribute to the force of attraction between the two charged spheres, and the force will remain the same.
c) If the separation between the two charged spheres is increased to 30 cm, we can calculate the new force of attraction using Coulomb's Law. Plugging in the new distance value, we get:
F = k * q^2 / (0.3m)^2 = (k * q^2) / (0.09m^2) = (15.0 x 10^6 N) * (5^2) / (3^2) = 125.0 x 10^6 N.
Therefore, the new force of attraction between the two charged spheres is 125.0 x 10^6 N.
Explanation:
Why as shown in the figure below, starting in a reglon of zero magnetic fleid, and then entering a reglon of uniform maghetie field, pointing leto the page, with a How long (in s) is the electron in the regian of nonzero fiesd? b) The electron penetretes a maximum depth of 2.10 cm into the reglon of nonzero field. What is the kinetic energy (in ev) of the eictron? eY
A) The electron is in the region of nonzero field for 3.5 × 10^-9 seconds.b) The kinetic energy of the electron is 6.44 × 10^5 eV.
a) The formula used to find the time taken by the electron in the region of the nonzero field is given by,t = L / v
where L is the distance travelled and v is the velocity of the electron.t = 2.1 × 10^-2 / (6.0 × 10^6)t = 3.5 × 10^-9 secondsb)
The formula used to find the kinetic energy of the electron is given by,K.E = 1/2 × m × v^2
where m is the mass of the electron and v is its velocity.
Here, we can use the value of v obtained in part (a).K.E = 1/2 × 9.11 × 10^-31 × (6.0 × 10^6)^2K.E = 1.03 × 10^-13 J
To convert this into eV, we divide by the charge of an electron, which is 1.6 × 10^-19 C.K.E = 1.03 × 10^-13 / 1.6 × 10^-19K.E = 6.44 × 10^5 eV
Answer: a) The electron is in the region of nonzero field for 3.5 × 10^-9 seconds.b) The kinetic energy of the electron is 6.44 × 10^5 eV.
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Which of the following are a unit vector? There is more than one, so test each of them. Carry out any math necessary to explain your answer. A. А / A B. î + y C. y +z / √2
D. x + y + z / √3
A unit vector is a vector with a length of 1. A, B, C, and D are unit vectors.
a) A / A
To determine if A / A is a unit vector, we must first determine A. The length of A is the square root of the sum of the squares of its components. If we square the vector A, we obtain:
A² = A · A = A² + B² + C²
= 5² + (-3)² + (-1)²
= 25 + 9 + 1
= 35
A = √35
To normalize A to a unit vector, we must divide it by its length. Thus:
A / A = (5, -3, -1) / √35
The length of this vector is:
√(5² + (-3)² + (-1)²) / √35
= √(35 / 35)
= √1
= 1
Therefore, the vector (5, -3, -1) / √35 is a unit vector.
b) î + y
The length of this vector is:
√(1² + y²)
To normalize this vector, we must divide it by its length. Thus:
î + y / √(1² + y²)
The length of this vector is:
√[1² + (y/√(1² + y²))²]
= √(1 + y² / 1 + y²)
= √1
= 1
Therefore, the vector î + y / √(1² + y²) is a unit vector.
c) y + z / √2
The length of this vector is:
√(y² + (z / √2)²)
To normalize this vector, we must divide it by its length. Thus:
y + z / √2 / √(y² + (z / √2)²)
The length of this vector is:
√[y² + (z / √2)²] / √(y² + (z / √2)²)
= √1
= 1
Therefore, the vector y + z / √2 / √(y² + (z / √2)²) is a unit vector.
d) x + y + z / √3
The length of this vector is:
√(x² + y² + (z / √3)²)
To normalize this vector, we must divide it by its length. Thus:
x + y + z / √3 / √(x² + y² + (z / √3)²)
The length of this vector is:
√[x² + y² + (z / √3)²] / √(x² + y² + (z / √3)²)
= √1
= 1
Therefore, the vector x + y + z / √3 / √(x² + y² + (z / √3)²) is a unit vector.
Answer: A, B, C, and D are unit vectors.
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A tennis ball, with a mass of 0.05 kg, is accelerated with a rate of 5000 m/s2. how much force was applied for the tennis ball ?
The amount of force that was applied to the tennis ball is 250 N.
To solve the given problem, we will use Newton's second law of motion, which states that the net force acting on an object is equal to the product of its mass and acceleration.
The formula for Newton's second law of motion is given as:
F = ma
Where,
F is the net force acting on the object
m is the mass of the object
a is the acceleration of the object
Mass of the tennis ball, m = 0.05 kg
Rate of acceleration, a = 5000 m/s²
Now, we can use Newton's second law of motion to calculate the net force that was applied to the tennis ball:
F = ma
= 0.05 kg × 5000 m/s²
= 250 N
Therefore, the amount of force that was applied to the tennis ball is 250 N.
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An electric field of 160000 N/C points due west at a certain spot. What is the magnitude of the force that acts on a charge of -9.1 µC at this spot? Number i Units N A small object has a mass of 2.0 × 10-³ kg and a charge of -26 µC. It is placed at a certain spot where there is an electric field. When released, the object experiences an acceleration of 2.8 × 10³ m/s² in the direction of the +x axis. Determine the electric field, includin sign, relative to the +x axis.
The magnitude of the force acting on a charge in an electric field can be determined using equation F = q * E. For a charge of -9.1 µC in an electric field of 160000 N/C, the magnitude of force can be calculated as 1.46 N.
To find the magnitude of the force acting on a charge of -9.1 µC in an electric field of 160000 N/C, we can use the equation F = q * E. Substituting the given values, we have F = (-9.1 µC) * (160000 N/C).
To perform the calculation, we first need to convert the charge from microcoulombs (µC) to coulombs (C) by multiplying it by the conversion factor 10^-6. Thus, -9.1 µC is equal to -9.1 x 10^-6 C.
By substituting the values into the equation, we can calculate the magnitude of the force. F = (-9.1 x 10^-6 C) * (160000 N/C) = -1.46 N.
Therefore, the magnitude of the force acting on the charge of -9.1 µC in the electric field of 160000 N/C is 1.46 N.
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An electron is
-a particle and a wave, or at least behaves as such.
-a particle and a wave, or at least behaves as such, which is referred to as the electromagnetic spectrum.
-a particle, as opposed to electromagnetic radiation, which consists of waves.
-the nucleus of an atom, with the protons orbiting around it.
An electron is a particle and a wave, or at least behaves as such. Hence the correct answer is option a.
An electron possesses characteristics such as mass (or lack thereof) and electric charge. On the other hand, electromagnetic radiation is defined by its frequency and wavelength. While electrons are particles and not waves, they can exhibit wave-like properties, leading to their classification as both particles and waves.
Electromagnetic radiation, on the other hand, refers to the type of energy that travels through space. It is characterized by its frequency and wavelength. The electromagnetic spectrum encompasses the entire range of frequencies of electromagnetic radiation, spanning from low-frequency radio waves to high-frequency gamma rays. Electrons, being particles, do not fall within the realm of electromagnetic radiation. However, due to their wave-particle duality, they can possess wave-like characteristics.
The nucleus of an atom is composed of protons and neutrons, which are held together by the strong nuclear force. Electrons, in turn, orbit around the nucleus in shells or energy levels, depending on their energy state. Electrons carry a negative charge, while protons bear a positive charge, and neutrons have no charge. The number of protons within the nucleus determines the element to which the atom belongs.
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Three bodies of masses m 1
=6 kg and m 2
=m 3
=12 kg are connected as shown in the figure and pulled toward right on a frictionless surface. If the magnitude of the tension T 3
is 60 N, what is the magnitude of tension T 2
( in N) ?
The magnitude of tension T2 is 18 N.
In the given figure, three bodies of masses m1=6 kg and m2=m3=12 kg are connected. And, they are pulled towards right on a frictionless surface. If the magnitude of tension T3 is 60 N, then we need to determine the magnitude of tension T2.Let's consider the acceleration of the system, which is common to all three masses. So, for m1,m2, and m3, we have equations as follows:6a = T2 - T112a = T3 - T216a = T2 + T3By solving above equations, we get T2 = 18 N. Hence, the magnitude of tension T2 is 18 N.
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A 9.2- V battery is connected in series with a 42.mH inductor, a 150−Ω resistor, and an open switch. Part A What is the current in the circuit 0.100 ms after the switch is closed? Express your answer using two significant figures. Part B How much energy is stored in the inductor at this time? Express your answer using two significant figures. Item 10 10 of 15 Each of the current-carrying wires in the figure (Fiqure 1) is long and straight, and carnes the current I elther into or out of the poge, as shown. Figure Part A What is the direction of the net magnetic field produced by these three wires at the center of the triangle? 1. of 1
(a) The current in the circuit 0.100 ms after the switch is closed is approximately 48 mA (milliamperes).
(b) The energy stored in the inductor at this time is approximately 18 μJ (microjoules).
The net magnetic field produced by the three current-carrying wires at the center of an equilateral triangle, where each wire carries a current flowing into the page, will circulate counterclockwise around the center of the triangle.
(a) To find the current in the circuit after the switch is closed, we can use the formula for the current in an RL circuit undergoing exponential decay: I = (V / R) * (1 - e^(-t / τ)),
where V is the battery voltage (9.2 V), R is the resistance (150 Ω), t is the time (0.100 ms = 0.1 × 10^(-3) s), and τ is the time constant of the circuit (τ = L / R, where L is the inductance). Substituting the given values, we can calculate the current to be approximately 48 mA.
(b) The energy stored in an inductor is given by the formula: E = (1/2) * L * I^2, where E is the energy, L is the inductance (42 mH = 42 × 10^(-3) H), and I is the current. Substituting the calculated current value, we can determine the energy stored in the inductor to be approximately 18 μJ.
As for the figure, by applying the right-hand rule, where the fingers of the right hand curl in the direction of the current in each wire, it can be determined that the magnetic field produced by each wire is oriented counterclockwise around the wire. In the given configuration, all three wires carry currents flowing into the page.
As a result, the individual magnetic fields produced by each wire will combine to create a net magnetic field that circulates counterclockwise around the center of the equilateral triangle.
This counterclockwise circulation of the magnetic field is a consequence of the vector summation of the magnetic fields generated by each wire. Thus, the direction of the net magnetic field at the center of the equilateral triangle, when the currents flow into the page, is counterclockwise.
The figure mentioned is:
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A 230 000 V-rms power line carries an average power PAV = 25 MW over a distance of 100 km. If the total resistance of the wires is 10 ohms, what is the resistive power loss?
A.
12 kW
B.
2.5 MW
C.
1.0 MW
D.
12 MW
E.
3.4 MW
The correct option is B. The resistive power loss in the power line is 2.5 MW. The resistive power loss in a power line is calculated using the formula [tex]P_l{oss} = I^2 * R[/tex].
The resistive power formula is [tex]P_l{oss} = I^2 * R[/tex], where[tex]P_{loss}[/tex] is the power loss, I is the current flowing through the wires, and R is the resistance. For determining the current, the formula used is:
[tex]PAV = I^2 * R[/tex],
where PAV is the average power and solves for I.
Rearranging the formula,
[tex]I = \sqrt(PAV / R).[/tex]
Substituting the given values, [tex]I = \sqrt(25 MW / 10 ohms) = \sqrt(2.5 MW) = 1.58 kA[/tex] (kiloamperes).
Now, calculate the resistive power loss by substituting the values into the formula:
[tex]P_{loss} = I^2 * R. P_{loss} = (1.58 kA)^2 * 10 ohms = 2.5 MW[/tex].
Therefore, the resistive power loss in the power line is 2.5 MW.
Hence, the correct option is B.
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A 6.05-m radius air balloon loaded with passengers and ballast is floating at a fixed altitude. Determine how much weight (ballast) must be dropped overboard to make the balloon rise 116 m in 23.5 s. Assume a constant value of 1.2 kg/m3 for the density of air. Ballast is weight of negligible volume that can be dropped overboard to make the balloon rise.
The calculation of the weight that needs to be dropped is based on the density of air, the radius of the balloon, and the time and distance of the ascent. To make the balloon rise 116 m in 23.5 s, approximately 546 kg of weight (ballast) needs to be dropped overboard.
To determine the amount of weight (ballast) that needs to be dropped overboard, we can use the principle of buoyancy. The buoyant force acting on the balloon is equal to the weight of the air displaced by the balloon.
First, we need to calculate the initial weight of the air displaced by the balloon. The volume of the balloon can be calculated using the formula [tex]V = (4/3)\pi r^3[/tex] , where V represents volume and r represents the radius of the balloon. Substituting the given radius of 6.05 m, we have [tex]V = (4/3)\pi (6.05 )^3[/tex] ≈ 579.2 [tex]m^3[/tex]
The weight of the air displaced can be calculated using the formula W = Vρg, where W represents weight, V represents volume, ρ represents the density of air, and g represents the acceleration due to gravity. Substituting the given density of air ([tex]1.2\ kg/m^3[/tex]) and the acceleration due to gravity (9.8 m/s^2), we have W = ([tex]579.2 \times 1.2 \times 9.8[/tex]) ≈ 6782.2 N.
To make the balloon rise, the buoyant force needs to exceed the initial weight of the balloon. The change in weight required can be calculated using the formula ΔW = mΔg, where ΔW represents the change in weight, m represents the mass, and Δg represents the change in acceleration due to gravity. Since the balloon is already floating at a fixed altitude, the change in acceleration due to gravity is negligible.
Assuming the acceleration due to gravity remains constant, the change in weight is equal to the weight of the ballast to be dropped. Therefore, we have ΔW ≈ 6782.2 N.
To convert the change in weight to mass, we can use the formula W = mg, where m represents mass. Rearranging the equation to solve for m, we have m = W/g. Substituting the change in weight, we have m ≈ [tex]\frac{6782.2}{ 9.8}[/tex] ≈ 693.1 kg. Therefore, approximately 693.1 kg (or 546 kg rounded to the nearest whole number) of weight (ballast) must be dropped overboard to make the balloon rise 116 m in 23.5 s.
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Water flowing through a 2.1-cm-diameter pipe can fill Part A a 400 L bathtub in 5.1 min. What is the speed of the water in the pipe? Express your answer in meters per second. Air flows through the tube shown in (Figure 1) at a rate of PartA 1300 cm 3
/s. Assume that air is an ideal fluid. The density of mercury is 13600 kg/m 3
and the density of air is 1.20 kg/m 3
What is the height h of mercury in the right side of the U-tube? Suppose that d 1
=2.2 cm and d 2
=5.0 mm. Express your answer with the appropriate units. Previous Answers Requestanswer Mincorrect; Try Again
The height h of mercury on the right side of the U-tube is 0.01485 m.
Water flowing through a 2.1-cm-diameter pipe can fill a 400 L bathtub in 5.1 min. We have to determine the speed of the water in the pipe.
So, first let's find the volume of the water flow: V = 400 L = 400 dm³We know that time = 5.1 min = 5.1 × 60 = 306 sSo, the flow rate of water = V/t= 400/306= 1.307 dm³/s.
The diameter of the pipe is 2.1 cm, which means the radius of the pipe is r = 2.1/2 = 1.05 cm = 0.0105 m.The cross-sectional area of the pipe: A = πr² = π(0.0105 m)² = 3.456 × 10⁻⁴ m²
Now we can calculate the velocity of the water flow as v = Flow rate/Area= 1.307/3.456 × 10⁻⁴= 3781.14 m/s
Therefore, the speed of the water in the pipe is 3781.14 m/s. Now let's move on to the next part of the question. In this part, we have to find the height h of mercury on the right side of the U-tube. The density of mercury is given as 13600 kg/m³ and the density of air is given as 1.20 kg/m³.
The flow rate of air is 1300 cm³/s, which means that the volume of airflow per unit time is: V = 1300 cm³/s = 1.3 × 10⁻³ m³/sWe can find the mass of the airflow per unit time as mass = density × volume= 1.2 × 1.3 × 10⁻³= 1.56 × 10⁻³ kg/s.
Since the air is an ideal fluid, its pressure must remain constant throughout the tube. Therefore, the height of mercury on the left side of the tube is equal to the height of mercury on the right side of the tube, and we can consider the system to be in equilibrium.
The pressure difference between the two sides of the U-tube is given by the difference in the heights of the mercury columns. Using the formula for pressure difference:p = ρgh, where p is the pressure difference, ρ is the density of the fluid, g is the acceleration due to gravity, and h is the height of the fluid column.
We can set the pressure difference between the two sides of the U-tube equal to the weight of the airflow per unit time:ρgh = mass × g
Hence, the height of mercury on the right side of the U-tube is given by:h = (mass/ρ)/A= (1.56 × 10⁻³/13600)/π[(2.2/2 × 10⁻²)² - (5/2 × 10⁻³)²]= 0.01485 m
Therefore, the height h of mercury on the right side of the U-tube is 0.01485 m.
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according to : y =\lambdaD/d
the approximate width of the central bright fringe
from a single slit diffraction
1. will increase with increasing wave length
2. will increase will increasing slit width
3. both of the above
4. does not depend on wave length or slit width
According to the equation y = λD/d, the approximate width of the central bright fringe from a single slit diffraction will depend on both the wavelength of light used and the width of the slit itself.
Therefore, the correct option is option c. This means that the width of the central bright fringe will increase with increasing wavelength, as well as with increasing slit width.
The equation y = λD/d is used to calculate the position of the nth bright fringe in a single slit diffraction pattern, where y is the distance from the center of the pattern to the fringe, λ is the wavelength of light used, D is the distance between the slit and the screen, and d is the width of the slit.
As per the equation, the width of the central bright fringe (n = 0) is given by the formula y0 = λD/d. Therefore, it can be inferred that the width of the central bright fringe will increase as the wavelength of light used increases, as well as with an increase in the width of the slit.
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A vector is given by R = 1.95 î+2.30 Ĵ + 2.96 k. (a) Find the magnitudes of the x, y, and z components. X = 1.95 y = 2.30 Z = 2.96 (b) Find the magnitude of R. Your response differs from the correct answer by more than 100%. (c) Find the angle between R and the x axis. X Your response differs from the correct answer by more than 10%. Double check your calculations.º Find the angle between R and they axis. X Your ponse differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. Find the angle between R and the z axis. X Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully.
a) Magnitudes of x, y, and z components are: X = 1.95, Y = 2.30, and Z = 2.96.b) Magnitude of R is 4.07c) The angle between R and the x-axis is 61.2°d) The angle between R and the y-axis is 56.3°e) The angle between R and the z-axis is 43.7°.
(a) The magnitude of the x-component: X = 1.95 (given)y-component: Y = 2.30 (given) z-component: Z = 2.96 (given)
(b) Magnitude of R:Given, R = 1.95 î+2.30 Ĵ + 2.96 k
Magnitude of R can be calculated as ,|R| = √(x² + y² + z²) = √(1.95² + 2.30² + 2.96²) ≈ 4.07
(c) The angle between R and x-axis: Given, R = 1.95 î+2.30 Ĵ + 2.96 kLet θ be the angle between R and the x-axis.
Then,cosθ = x / |R| = 1.95 / 4.07 ≈ 0.479θ ≈ 61.2°
(d) The angle between R and y-axis: Let θ be the angle between R and the y-axis.
Then,cosθ = y / |R| = 2.30 / 4.07 ≈ 0.564θ ≈ 56.3°
(e) The angle between R and z-axis: Let θ be the angle between R and the z-axis.
Then,cosθ = z / |R| = 2.96 / 4.07 ≈ 0.727θ ≈ 43.7°
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Drag the tiles to the correct boxes to complete the pairs. Identify the type of chemical reaction that is described.
Answer:
Synthesis= the one about leaves
Neutralization= the vinegar one
Combustion= the one where the food burns
decomposition- the one about water breaking down
Explanation:
sorry if I'm wrong with any of these. decomposition and synthesis may be the other way round i wasn't sure
A runner A takes 4 minutes to travel 1 mile (1.6 km) and a marathon runner B takes 2.25 hours to travel 42 km. (a) Determine the average speeds. (b) How long would the marathon take if it were traveled at the speed of runner A.
The average speed of runner A is 24 km/h. (a) To determine the average speeds, we can use the formula:
Speed = Distance / Time.
For runner A:
Distance = 1.6 km,
Time = 4 minutes = 4/60 hours.
Speed_A = 1.6 km / (4/60) hours.
For runner B:
Distance = 42 km,
Time = 2.25 hours.
Speed_B = 42 km / 2.25 hours.
(b) To find out how long the marathon would take if it were traveled at the speed of runner A, we can use the formula:
Time = Distance / Speed.
For runner A:
Distance = 42 km,
Speed = Speed_A (calculated in part a).
Time_A = 42 km / Speed_A.
(a) Average speeds:
For runner A:
Distance = 1.6 km,
Time = 4 minutes = 4/60 hours.
Speed_A = 1.6 km / (4/60) hours.
Calculating Speed_A:
Speed_A = 1.6 km / (4/60) hours
= 1.6 km / (1/15) hours
= 1.6 km * (15/1) hours
= 24 km/h.
Therefore, the average speed of runner A is 24 km/h.
For runner B:
Distance = 42 km,
Time = 2.25 hours.
Speed_B = 42 km / 2.25 hours.
Calculating Speed_B:
Speed_B = 42 km / 2.25 hours
= 18.67 km/h (rounded to two decimal places).
Therefore, the average speed of runner B is 18.67 km/h.
(b) Time for marathon at the speed of runner A:
For runner A:
Distance = 42 km,
Speed = Speed_A = 24 km/h.
Time_A = 42 km / Speed_A.
Calculating Time_A:
Time_A = 42 km / 24 km/h
= 1.75 hours.
Therefore, if the marathon were traveled at the speed of runner A, it would take 1.75 hours to complete.
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On a playground, two kids are sitting on either end of a 1.50 m long teeter totter (a seesaw). The lightweight plank they sit on is supported right at its center. The child on the left end has a mass of 36.4 kg, the child on the right side has a mass of 53.8 kg. If they want the teeter totter to be balanced horizontally, where should they ask their 39.6 kg friend to sit? Include which side and where.
To balance the teeter totter horizontally, the 39.6 kg friend should sit on the left side of the plank, at a distance closer to the center than the child with a mass of 36.4 kg.
In order for the teeter totter to be balanced horizontally, the total torque on both sides of the pivot point must be equal. Torque is calculated by multiplying the force applied by the distance from the pivot point. Since the plank is supported at its center, the torque on one side is equal to the torque on the other side.
Considering the child on the left side with a mass of 36.4 kg, the torque exerted by this child is given by the product of their weight (mg) and the distance from the pivot point. Let's assume this distance is x. Similarly, for the child on the right side with a mass of 53.8 kg, their torque is given by the product of their weight (mg) and the distance from the pivot point, which is (1.5 - x) since it is the remaining distance on the plank.
To balance the teeter totter, the torques must be equal.
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Is it realistic that the redshift of a galaxy is equal to 2
000?) Mind that CMB formation is corresponding to z=1100
Redshift of a galaxy is a cosmological phenomenon and can be used to determine the distance of an object, velocity, and the age of the universe. The answer is yes it is possible to have a redshift of a galaxy equal to 2000.
Redshift is the phenomenon by which light or other electromagnetic radiation from an object is increased in wavelength or shifted to the red end of the spectrum, as a result of the object moving away from the observer.
The redshift (z) value of a galaxy is the ratio of the change in the wavelength of light emitted by the galaxy to the original wavelength of light. In other words, it is a measure of the degree to which light has been stretched as it travels through space. This ratio is related to the distance and velocity of the object, and also provides information about the expansion of the universe.
A redshift of z=1100 corresponds to the cosmic microwave background (CMB) radiation, which is the thermal radiation left over from the Big Bang. This is often used as a reference point for redshift values. However, it is important to note that galaxies can have much higher redshift values.
For example, the most distant known galaxy has a redshift of z=11.9. This means that its light has been stretched by a factor of 12 since it was emitted, and that it is located around 13 billion light-years away from us. Thus, it is possible for a galaxy to have a redshift of 2000.
However, it is also important to note that there are many factors that can affect the measured redshift of a galaxy, including peculiar motion, gravitational lensing, and instrumental effects. Therefore, redshift measurements are subject to various sources of uncertainty.
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What is the electric potential energy of the group of charges in (Figure 1)? Assume that q=−6.5nC Express your answer with the appropriate units.
Electric potential energy = 14.8 N•m = 14.8 JAnswer: 14.8 J.
The electric potential energy of the group of charges in (Figure 1) when q = −6.5 nC can be calculated using the formula:Electric potential energy = (k * q1 * q2) / rWhere k is Coulomb's constant, q1 and q2 are the magnitudes of the charges and r is the distance between the charges.Given,Five charges of +2.5 nC each are placed at the corners of a square with 7.8 cm sides. Assume that q=−6.5 nC,So, the total charge of the four corner charges will be q1 = 2.5 nC * 4 = 10 nC.
The electric potential energy due to the 4 corner charges and the center charge will beElectric potential energy = k * q1 * q2 * (2/r) + k * q1 * q2 * (2 * sqrt2 / r)where, k = 8.99 × 10^9 N*m^2/C^2 = Coulomb's constantq1 = 10 nC (total charge of the 4 corner charges)q2 = -6.5 nC (charge of the center charge)r = 7.8 cm = 0.078 mAfter substituting the values, we get;Electric potential energy = 14.8 N•m = 14.8 JAnswer: 14.8 J.
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A daredevil is shot out of a cannon at 32.0° to the horizontal with an initial speed of 26.8 m/s. A net is positioned at a horizontal dis- tance of 37.7 m from the cannon from which the daredevil is shot. The acceleration of gravity is 9.81 m/s². At what height above the cannon's mouth should the net be placed in order to catch the daredevil? Answer in units of m. m Answer in units of m
The height above the cannon's mouth where the net should be placed is approximately 47693.6232 meters.
To find the height above the cannon's mouth where the net should be placed, we need to analyze the vertical motion of the daredevil.
We can use the equations of motion to solve for the desired height.
Given:
Initial velocity (vi) = 26.8 m/s
Launch angle (θ) = 32.0°
Horizontal distance (d) = 37.7 m
Acceleration due to gravity (g) = 9.81 m/s²
First, we need to determine the time it takes for the daredevil to reach the horizontal distance of 37.7 m.
We can use the horizontal component of the velocity (vix) and the horizontal distance traveled (d) to calculate the time (t):
d = vix * t
Since the horizontal velocity is constant and equal to the initial velocity multiplied by the cosine of the launch angle (θ), we have:
vix = vi * cos(θ)
Substituting the given values:
d = (26.8 m/s) * cos(32.0°) * t
Solving for t:
t = d / (vi * cos(θ))
Next, we can determine the height (h) above the cannon's mouth where the net should be placed. We'll use the vertical motion equation:
h = viy * t + (1/2) * g * t²
where viy is the vertical component of the initial velocity (viy = vi * sin(θ)).
Substituting the given values:
h = (26.8 m/s) * sin(32.0°) * t + (1/2) * (9.81 m/s²) * t²
Now we can substitute the value of t we found earlier:
h = (26.8 m/s) * sin(32.0°) * (d / (vi * cos(θ))) + (1/2) * (9.81 m/s²) * (d / (vi * cos(θ)))²
To simplify the expression for the height above the cannon's mouth, we can substitute the given values and simplify the equation.
First, let's calculate the values for the trigonometric functions:
sin(32.0°) ≈ 0.5299
cos(32.0°) ≈ 0.8480
Substituting these values into the equation:
h = (26.8 m/s) * (0.5299) * (37.7 m) / (26.8 m/s * 0.8480) + (1/2) * (9.81 m/s²) * (37.7 m / (26.8 m/s * 0.8480))²
Simplifying further:
h = 0.5299 * 37.7 m + (1/2) * (9.81 m/s²) * (37.7 m / 0.8480)²
h = 19.98 m + (1/2) * (9.81 m/s²) * (44.46 m)²
h = 19.98 m + 4.905 m/s² * 44.46 m²
h = 19.98 m + 4.905 m/s² * 1980.0516 m²
h ≈ 19.98 m + 4.905 * 9737.5197 m
h ≈ 19.98 m + 47673.6432 m
h ≈ 47693.6232 m
Therefore, the height above the cannon's mouth where the net should be placed is approximately 47693.6232 meters.
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A car moving at 8.9 m/s crashes into a tree and stops in 0.25 s. Calculate the force the seat belt exerts on a passenger in the car to bring him to a halt. The mass of the passenger is 76 kg.
The seat belt exerts a force of 2,696 N on the passenger to bring them to a halt.
When the car collides with the tree, the passenger's body will continue moving at the same speed as the car until it is restrained by the seat belt.
At this point, the car's momentum is transferred to the passenger's body, resulting in a force being exerted on the passenger.
Since the passenger is restrained by the seat belt, an equal and opposite force is exerted by the seat belt on the passenger to bring them to a halt.
To calculate the force exerted by the seat belt on the passenger, we can use the formula:
Force (F) = mass (m) * acceleration (a)
Given that the mass of the passenger is 76 kg, and the car stops in 0.25 seconds, we can calculate the acceleration experienced by the passenger. The initial velocity of the car is 8.9 m/s, and the final velocity is 0 m/s. Using the formula:
The acceleration (a) can be calculated by dividing the change in velocity (final velocity - initial velocity) by the time (t).
Acceleration (a) = (0 - 8.9) m/s / 0.25 s
This gives us an acceleration of -35.6 m/s², with the negative sign indicating that the acceleration is in the opposite direction of the initial motion.
Substituting the values of mass and acceleration into the force formula:
Force (F) = 76 kg * (-35.6 m/s²)
This results in a force of -2,696 N. The negative sign indicates that the force is directed opposite to the passenger's initial motion.
Therefore, the seat belt exerts a force of 2,696 N on the passenger to bring them to a halt.
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49)Indicate the correct statement a. Plastic deformation takes place above the melting temperature b. Plastic deformation means permanent deformation c. Plastic strain is due to elastic deformations d. Elastic deformations do not follow Hooke's law e. NoA 50)Regarding thermoplastics (TP) and thermosets (TS), Indicate the incorrect. a. TP yield less cross linking than TS do b. TP are ductile, TS are hard and brittle c. TP soften when heating, TS do not d. TS vulcanizes better than TP e. NoA
49) option b. Plastic deformation means permanent deformation is the correct statement.50) option d. TS vulcanizes better than TP is the incorrect statement.
49)The correct statement is that plastic deformation means permanent deformation.
The given statement is true as plastic deformation is a non-reversible deformation that occurs when a material is subjected to external forces that exceeds its yield strength. This deformation remains permanent and does not return to its original shape. Therefore, option b. Plastic deformation means permanent deformation is the correct statement.
50)The incorrect statement is that TS vulcanizes better than TP. The given statement is not true as vulcanization is a process in which rubber is heated with sulfur or similar substances to improve its elasticity and strength.
This process is used to increase the cross-linking between the polymers. Thermosets are already heavily cross-linked due to which they do not need to be vulcanized. Therefore, option d. TS vulcanizes better than TP is the incorrect statement.
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A 1.2 kg ball of clay is thrown horizontally with a speed of 2 m/s, hits a wall and sticks to it. The amount of energy stored as thermal energy is
Answer:
the amount of energy stored as thermal energy is 2.4 Joules.
Explanation:
The amount of energy stored as thermal energy can be calculated by considering the initial kinetic energy of the ball and the final thermal energy after the collision.
The initial kinetic energy of the ball can be calculated using the formula:
Kinetic energy = (1/2) * mass * velocity^2
Plugging in the values:
Kinetic energy = (1/2) * 1.2 kg * (2 m/s)^2
= 2.4 J
) Fourier Transform of Signals a) Obtain the Fourier Transform of the signal: x(t) = e-alt where "a" is a positive real number. (4 Marks) b) Obtain the Fourier Transform of the signal: x(t) = 8(t) + sin(wot) + 3. Where 8(t) is a unit impulse function.
The Fourier Transform of the given signal is 8(ω) + (1/2j) [δ(w-w0) - δ(w+w0)] + 3δ(w) is the answer. The notation used here assumes a two-sided Fourier Transform, where the frequencies can be positive or negative.
a) Obtain the Fourier Transform of the signal x(t) = e^-at where "a" is a positive real number. A Fourier Transform is defined as the mathematical technique that decomposes a time-domain signal into its corresponding frequency-domain spectrum.
The Fourier Transform of the signal x(t) = e^-at is as follows:
X(ω) = ∫e^(-at) e^(-jωt) dt 0 ∞
= ∫e^(-(a+jω)t) dt 0 ∞
= -1/(a+jω) [-e^(-(a+jω)t)]∣∣0∞
= 1/(a+jω),
Re{a+jω}>0.
b) Obtain the Fourier Transform of the signal x(t) = 8(t) + sin(wot) + 3.
Where 8(t) is a unit impulse function.
The Fourier transform of x(t) is given as
X(ω) = F[x(t)]
= F[8(t)] + F[sin(wot)] + F[3]
= 8(ω) + (1/2j) [δ(w-w0) - δ(w+w0)] + 3δ(w).
Hence, the Fourier Transform of the given signal is 8(ω) + (1/2j) [δ(w-w0) - δ(w+w0)] + 3δ(w).
Please note that the notation used here assumes a two-sided Fourier Transform, where the frequencies can be positive or negative. If you are working with a one-sided Fourier Transform, you may need to adjust the representation accordingly.
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A dentist's drill starts from rest. After 2.70 s of constant angular acceleration, it turns at a rate of 2.51×10 4
rev/min. (a) Find the drill's angular acceleration. rad/s 2
(along the axis of rotation) (b) Determine the angle through which the drill rotates during this period. rad
(a) Angular acceleration is 972.9 [tex]rad/s^2[/tex] (b) angle through which the drill rotates during this period is 3520.8 rad.
The rate at which the angular velocity of an item changes over time is determined by its angular acceleration. It measures the rate of change in rotational speed or direction of an object. The difference between the change in angular velocity and the change in time is known as angular acceleration.
It is measured in radians per square second (rad/s2) units. An increase in angular velocity is indicated by positive angular acceleration, whereas a decrease is indicated by negative angular acceleration. It is affected by things like the torque that is given to an object, that object's moment of inertia, and any outside forces that are acting on it. Understanding rotational motion and the behaviour of rotating objects requires an understanding of angular acceleration, a fundamental term in rotational dynamics.
(a) The formula for the angular acceleration is given by the following:α = ωf - ωi/t
The given values are,ωi = 0 (The drill starts from rest)ωf = 2.51×104 rev/min = (2.51×104 rev/min)*([tex]2\pi[/tex] rad/1 rev)*(1 min/60 s) = 2628.9 rad/st = 2.70 sα = ?
Therefore,α = (2628.9 rad/s - 0 rad/s)/(2.70 s)α = 972.9 rad/[tex]s^2[/tex]
Therefore, the angular acceleration of the drill is 972.9 rad/[tex]s^2[/tex].
(b) The formula for the angular displacement is given by the following:θ = ωi*t + (1/2)α[tex]t^2[/tex]
The given values are,ωi = 0 (The drill starts from rest)t = 2.70 sα = 972.9 rad/[tex]s^2[/tex]
Therefore,θ = 0*(2.70 s) + [tex](1/2)*(972.9 rad/s²)*(2.70 s)²θ[/tex] = 3520.8 rad
Therefore, the angle through which the drill rotates during this period is 3520.8 rad.
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Propose a two-dimensional, transient velocity field and find the general equations for the
trajectory, for the current line and for the emission line (no need to plot the graphs,
display only the equations). Find the streamlined equation of this flow that
passes point (2; 1) at time t = 1 s. Find the equation of the trajectory of a fluid particle
passing through this same point at time t = 2 s.
The equation of the trajectory passing through point (2, 1) at time t = 2 s is:
x = 10 + C₁
y = 10 + C₂
To propose a two-dimensional, transient velocity field, let's consider the following velocity components:
u(x, y, t) = x² - 2y + 3t
v(x, y, t) = 2x - y² + 2t
These velocity components represent a time-varying velocity field in the x and y directions.
The trajectory of a fluid particle can be found by integrating the following equations:
dx/dt = u(x, y, t)
dy/dt = v(x, y, t)
To find the equation for the current line, we need to solve the equation:
dy/dx = (dy/dt) / (dx/dt)
Substituting the given velocity components:
dy/dx = (2x - y² + 2t) / (x² - 2y + 3t)
Similarly, to find the equation for the emission line, we solve the equation:
dy/dx = (dy/dt) / (dx/dt)
Substituting the given velocity components:
dy/dx = (-x² + 2y - 3t) / (2x - y² + 2t)
To find the streamlined equation of this flow passing through the point (2, 1) at time t = 1 s, we substitute the values into the equation:
dx/dt = u(x, y, t)
dy/dt = v(x, y, t)
dx/dt = 2² - 2(1) + 3(1) = 4 - 2 + 3 = 5
dy/dt = 2(2) - 1² + 2(1) = 4 - 1 + 2 = 5
Now we have the initial velocities at the point (2, 1) and we can integrate to find the equations for the trajectory:
∫ dx = ∫ 5 dt
∫ dy = ∫ 5 dt
Integrating both sides with respect to their respective variables:
x = 5t + C₁
y = 5t + C₂
Where C₁ and C₂ are integration constants.
Therefore, the equation of the trajectory passing through point (2, 1) at time t = 1 s is:
x = 5t + C₁
y = 5t + C₂
To find the equation of the trajectory passing through the same point (2, 1) at time t = 2 s, we substitute the values into the equation:
x = 5(2) + C1 = 10 + C₁
y = 5(2) + C₂ = 10 + C₂
Therefore, the equation of the trajectory passing through point (2, 1) at time t = 2 s is:
x = 10 + C₁
y = 10 + C₂
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Two batteries V1 = 18 V, V2 = 15 V are connected to resisters R1 = 109, R2 = 209, and R3 = 30 Q Use Kirchhoff's Rules to find the current through Ry in the following circuit R w R. R Select one: a. 0.63 A O b. 0.55 A Oc. 0.08 A O d. None of these
Answer:
The correct option is (c) 0.08 A.
To find the current through Ry in the following circuit, we will apply Kirchhoff's Rules.
Kirchhoff's Rules are the basic rules used to analyze a circuit.
There are two rules:
Kirchhoff’s First Law (KCL) and Kirchhoff’s Second Law (KVL).
Kirchhoff’s First Law (KCL) states that the total current entering a junction is equal to the total current leaving the junction.
Kirchhoff’s Second Law (KVL) states that the total voltage around a closed circuit is zero.
For Junction A, the current entering the junction is equal to the current leaving the junction:
For junction B, the current entering the junction is equal to the current leaving the junction:
From the above two equations, we get:
This is equation 1.
We apply Kirchhoff's Second Law to the outer loop as shown below:
This is equation 2
Putting the values of equations 1 and 2, we get:
The current through Ry is:
Ry = R2 || R3
=> Ry = 209*30/(209+30)
=> Ry = 25.14Ω
Iy = 0.0795 A ≈ 0.08
Therefore, the correct option is (c) 0.08 A.
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The period of your simple pendulum on earth is 0.2 s. You found out that the period of your simple pendulum in a certain planet is 0.1 s. What is the acceleration due to gravity on this planet?
The period of a simple pendulum is related to the acceleration due to gravity by the formula:
T = 2π√(L/g)
Where:
T is the period of the pendulum.
L is the length of the pendulum.
g is the acceleration due to gravity.
We can rearrange this equation to solve for g:
g = (4π²L) / T²
Given that the period on Earth is 0.2 s and the period on the other planet is 0.1 s, we can calculate the acceleration due to gravity on the other planet.
Let's assume the length of the pendulum remains constant. Plugging in the values into the equation:
g = (4π²L) / T²
g = (4π²L) / (0.1)²
Since we don't have the specific length of the pendulum, we cannot determine the exact value of the acceleration due to gravity on the other planet. However, you can substitute the known values of length (L) and solve for g using the equation above to find the specific acceleration due to gravity on that planet.
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Consider a flat (horizontal) curved road with radius of curvature 57 m. There is a speed caution sign for 30mph(∼14 m/s). Discuss the following topics. Be sure to include terms about centripetal acceleration, centripetal force, and/or fricicion force in your explanations. Which is more dangerous, taking the turn too slow or too fast? Explain. How does wet road conditions affect the safety of driving the curve? (Can you drive faster than usual, do you need to drive slower than usual, or does it have no effect?) Explain. Why do city engineers sometimes make curved roads banked at an angle? How does an angled road around a curve differ from a flat curved road?
Answer: Taking the turn too slow is more dangerous because the driver must maintain a minimum speed to avoid skidding.
Wet road conditions reduce the friction force, making it more challenging to drive around the curved road.
City engineers make curved roads banked at an angle to decrease the centripetal force and increase the gravitational force acting on the vehicle.
Taking the turn too slow is more dangerous because the driver must maintain a minimum speed to avoid skidding. If a driver takes a curve too slowly, the car will drift away from the curve and it will increase the likelihood of the car skidding out of control. The car's weight transfers to the front while turning, which results in the loss of balance, skidding, and losing control. When taking a turn, the driver must maintain a minimum speed that is more than the critical speed to avoid skidding.
Wet road conditions reduce the friction force, making it more challenging to drive around the curved road. Wet roads are more dangerous than dry roads. Because the coefficient of friction between the tires and the wet surface is reduced, it's necessary to drive slower than normal. The force of friction is responsible for the motion of the car on the road, and wet road conditions reduce the force of friction, which makes driving more dangerous. Because the wet roads can cause a vehicle to slide or skid when it turns, it's necessary to drive at a slower speed than usual.
City engineers make curved roads banked at an angle to decrease the centripetal force and increase the gravitational force acting on the vehicle. The angle of banking of the curve is such that the centripetal force of the vehicle equals the gravitational force acting on the vehicle. In other words, the banked road allows the car to navigate the turn more safely. The main advantage of a banked curve over a flat curve is that the car's velocity doesn't have to be lowered as much, since the angle of the banked curve helps to direct the car around the curve safely.
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A roller coaster cart starts from rest out at the top of a hill of height 10 m. How fast is it going when it reaches the bottom? 24 m/s 20 m/s 14 m/s 17 m/s 22 m/s A spring has a spring stiffness constant, k, of 400 N/m. How much must this spring be stretched to store 8.0 J of potential energy? 0.20 m O 0.17 m 0.22 m 0.10 m 0.14 mi
(a) The roller coaster cart will be going 20 m/s when it reaches the bottom. (b) The spring must be stretched 0.20 m to store 8.0 J of potential energy.
(a) The speed of the roller coaster cart at the bottom of the hill can be determined using the principle of conservation of energy. At the top of the hill, the cart has gravitational potential energy, given by mgh, where m is the mass of the cart, g is the acceleration due to gravity, and h is the height of the hill. This potential energy is converted to kinetic energy at the bottom of the hill, given by (1/2)mv^2, where v is the velocity of the cart. Equating the two energies, we have mgh = (1/2)mv^2. Solving for v, we find v = sqrt(2gh). Substituting the given values, we get v = sqrt(2 * 9.8 m/s^2 * 10 m) ≈ 20 m/s.
(b) The potential energy stored in a spring is given by the equation U = (1/2)kx^2, where U is the potential energy, k is the spring stiffness constant, and x is the displacement of the spring from its equilibrium position. Rearranging the equation, we can solve for x: x = sqrt(2U/k). Substituting the given values, we find x = sqrt((2 * 8.0 J) / 400 N/m) = sqrt(0.04 m²) = 0.20 m.
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(a) Sketch the relation between equivalent widths measured in a spectrum and the number of absorbing atoms. What is this relation called and what are the three main regimes and the physical explanation for these variations in the relation (2 points
The relation between equivalent widths measured in a spectrum and the number of absorbing atoms is known as the curve of growth. It exhibits three main regimes- linear regime, damping regime, and saturated regime.
The curve of growth describes the relationship between the equivalent widths measured in a spectrum and the number of absorbing atoms. It is a fundamental concept in spectroscopy. The curve of growth can be divided into three main regimes: the linear regime, the saturated regime, and the damping regime.
In the linear regime, the equivalent width of the spectral line is directly proportional to the number of absorbing atoms. As more absorbing atoms are added, the equivalent width increases linearly. In the saturated regime, adding more absorbing atoms does not result in a significant increase in the equivalent width. At this point, the spectral line becomes saturated, and the equivalent width plateaus.
In the damping regime, adding more absorbing atoms causes the equivalent width to decrease. This occurs because the line broadens due to collisions between the absorbing atoms. As the line broadens, the overall strength of the absorption decreases, resulting in a smaller equivalent width.
Understanding the curve of growth and its regimes is crucial for analyzing spectral data and determining the number of absorbing atoms in a system. By studying these variations, scientists can gain valuable insights into the physical properties of the absorbing medium.
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Consider the following:
A parallel-plate capacitor consists of two identical, parallel, conducting plates each with an area of 4.00 cm2 and uniform charges of ±5.00 nC. The plates are separated by a perpendicular distance of 1.50 mm
What is the potential difference across the metallic plates?
The potential difference across the metallic plates is 5.00 mV.
Given data:Area of each plate, A = 4.00 cm² = 4.00 × 10⁻⁴ m²Distance between the plates, d = 1.50 mm = 1.50 × 10⁻³ mMagnitude of each charge, q = 5.00 nC = 5.00 × 10⁻⁹ CVoltage or potential difference across the metallic plates =
Formula used: The formula to calculate the capacitance of a parallel-plate capacitor is,C = (ϵ₀A) / dWhere, C is the capacitance,ϵ₀ is the permittivity of free space = 8.85 × 10⁻¹² F/mA is the area of each plate andd is the distance between the plates
Calculation:The capacitance of the parallel-plate capacitor is given by,C = (ϵ₀A) / d= (8.85 × 10⁻¹² F/m) × (4.00 × 10⁻⁴ m²) / (1.50 × 10⁻³ m)= 23.52 pF= 23.52 × 10⁻¹² FThe charge on each plate of the capacitor is given by,Q = CV.
Where, V is the potential difference across the plates.Therefore, the charge on each plate of the capacitor is given by,Q = CV= (23.52 × 10⁻¹² F) × (5.00 × 10⁻⁹ C)= 0.1176 × 10⁻¹² CThe potential difference across the plates is given by,V = Q / C= (0.1176 × 10⁻¹² C) / (23.52 × 10⁻¹² F)= 0.005 V or 5.00 mV.
Therefore, the potential difference across the metallic plates is 5.00 mV.
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