Question 1

The magnetic field at a distance of 2 cm from a current carrying wire is 4 μT.What is the magnetic field at a distance of 4 cm from the wire?

Accepted Answer

A)  1/2 µT 
B)  1 µT 
C)  2 µT 
D)  4 µT 
E)  8 µT 
A)  1/2 µT 
B)  1 µT 
C)  2 µT 
D)  4 µT 
E)  8 µT

Question 2

What is the minimum magnitude of an electric field that balances the weight of a plastic sphere of mass 6.4 g that has been charged to -3.0 nC?

Accepted Answer

A)  2.1 × 107 N/C 
B)  2.4 × 106 N/C 
C)  4.5 × 106 N/C 
D)  6.4 × 106 N/C 
A)  2.1 × 107 N/C 
B)  2.4 × 106 N/C 
C)  4.5 × 106 N/C 
D)  6.4 × 106 N/C

Question 3

An unstable particle is moving at a speed of 2.6 × 108 m/s relative to a laboratory. Its lifetime is measured by a stationary observer in the laboratory to be 4.7 × 10-6 seconds.What is the lifetime of the particle,measured in the rest frame of the particle? (c = 3.00 × 108 m/s)

Accepted Answer

Question 4

Two very large parallel sheets a distance d apart have their centers directly opposite each other.The sheets carry equal but opposite uniform surface charge densities.A point charge that is placed near the middle of the sheets a distance d/2 from each of them feels an electrical force F due to the sheets.If this charge is now moved closer to one of the sheets so that it is a distance d/4 from that sheet,what force will feel?

Accepted Answer

A)  4F 
B)  2F 
C)  F 
D)  F/2 
E)  F/4 
A)  4F 
B)  2F 
C)  F 
D)  F/2 
E)  F/4

Question 5

Which one of the following graphs could possibly represent the vertical position as a function of time for an object in free fall?

Accepted Answer

A) 
  
B) 
  
C) 
  
D) 
  
E) 
  
A) 
  
B) 
  
C) 
  
D) 
  
E)

Question 6

At the same moment from the top of a building 3.0 × 102 m tall,one rock is dropped and one is thrown downward with an initial velocity of 10 m/s.Both of them experience negligible air resistance.How much EARLIER does the thrown rock strike the ground?

Accepted Answer

A)  0.95 s 
B)  0.86 s 
C)  0.67 s 
D)  They land at exactly the same time. 
A)  0.95 s 
B)  0.86 s 
C)  0.67 s 
D)  They land at exactly the same time.

Question 7

On planet X,the absolute pressure at a depth of 2.00 m below the surface of a liquid nitrogen lake is 5.00 × 105 N/m2. At a depth 5.00 m below the surface,the absolute pressure is 8.00 × 105 N/m2. The density of liquid nitrogen is 808 kg/m3.
(a)What is the atmospheric pressure on planet X?
(b)What is the acceleration due to gravity on planet X?

Accepted Answer

(a)3.00 ×

Question 8

If the intensity level at distance d of one trombone is 70 dB,what is the intensity level of 76 identical trombones,all at distance d?

Accepted Answer

A)  146 dB 
B)  89 dB 
C)  5320 dB 
D)  76 dB 
E)  82 dB 
A)  146 dB 
B)  89 dB 
C)  5320 dB 
D)  76 dB 
E)  82 dB

Question 9

The emf and the internal resistance of a battery are as shown in the figure.When the terminal voltage Vab is equal to 17.4 V,what is the current through the battery,including its direction?

Accepted Answer

A)  6.8 A, from b to a 
B)  8.7 A, from b to a 
C)  6.8 A, from a to b 
D)  8.7 A, from a to b 
E)  16 A, from b to a 
A)  6.8 A, from b to a 
B)  8.7 A, from b to a 
C)  6.8 A, from a to b 
D)  8.7 A, from a to b 
E)  16 A, from b to a

Question 10

A woman is straining to lift a large crate,without success because it is too heavy.We denote the forces on the crate as follows: P is the upward force the woman exerts on the crate,C is the vertical contact force exerted on the crate by the floor,and W is the weight of the crate.How are the magnitudes of these forces related while the woman is trying unsuccessfully to lift the crate?

Accepted Answer

A)  P + C = W 
B)  P + C  W 
D)  P = C 
A)  P + C = W 
B)  P + C  W 
D)  P = C

Question 11

The velocity of an object as a function of time is given by v(t)= 2.00 m/s + (3.00 m/s)t - (1.0 m/s2)t2. Determine the instantaneous acceleration of the object at time t = 5.00 s.

Accepted Answer

A)  -8.00 m/s2 
B)  -7.00 m/s2 
C)  2.00 m/s2 
D)  0.00 m/s2 
E)  -2.00 m/s2 
A)  -8.00 m/s2 
B)  -7.00 m/s2 
C)  2.00 m/s2 
D)  0.00 m/s2 
E)  -2.00 m/s2

Question 12

Suppose you have two point charges of opposite sign.As you move them farther and farther apart,the potential energy of this system relative to infinity

Accepted Answer

A)  increases. 
B)  decreases. 
C)  stays the same. 
A)  increases. 
B)  decreases. 
C)  stays the same.

Question 13

An object is placed 10 cm from a convex lens of focal length 20 cm.What is the lateral magnification of the object?

Accepted Answer

A)  0.50 
B)  1.0 
C)  1.5 
D)  2.0 
E)  2.5 
A)  0.50 
B)  1.0 
C)  1.5 
D)  2.0 
E)  2.5

Question 14

Consider a very small hole in the bottom of a tank 20.0 cm in diameter filled with water to a height of 50.0 cm. Find the speed at which the water exits the tank through the hole.

Accepted Answer

A)  3.13 m/s 
B)  9.80 m/s 
C)  31.8 m/s 
D)  34.9 m/s 
A)  3.13 m/s 
B)  9.80 m/s 
C)  31.8 m/s 
D)  34.9 m/s

Question 15

Approximately how many pennies would you have to stack to reach an average 8-foot ceiling?

Accepted Answer

A)  2 × 102 
B)  2 × 103 
C)  2 × 104 
D)  2 × 105 
E)  2 × 106 
A)  2 × 102 
B)  2 × 103 
C)  2 × 104 
D)  2 × 105 
E)  2 × 106

Question 16

If the acceleration of an object is negative,the object must be slowing down.

Accepted Answer

A) True 
 B)False

Question 17

Suppose that a car traveling to the west (the -x direction)begins to slow down as it approaches a traffic light.Which statement concerning its acceleration in the x direction is correct?

Accepted Answer

A)  Both its acceleration and its velocity are positive. 
B)  Both its acceleration and its velocity are negative. 
C)  Its acceleration is positive but its velocity is negative. 
D)  Its acceleration is negative but its velocity is positive. 
A)  Both its acceleration and its velocity are positive. 
B)  Both its acceleration and its velocity are negative. 
C)  Its acceleration is positive but its velocity is negative. 
D)  Its acceleration is negative but its velocity is positive.

Question 18

In a certain electroplating process gold is deposited by using a current of 14.0 A for 19 minutes.A gold ion,Au+,has a mass of approximately 3.3 × 10-22 g.How many grams of gold are deposited by this process?

Accepted Answer

A)  33 g 
B)  16 g 
C)  22 g 
D)  28 g 
E)  97 g 
A)  33 g 
B)  16 g 
C)  22 g 
D)  28 g 
E)  97 g

Question 19

Estimate the number of times the earth will rotate on its axis during a human's lifetime.

Accepted Answer

A)  3 × 104 
B)  3 × 105 
C)  3 × 106 
D)  3 × 107 
E)  3 × 108 
A)  3 × 104 
B)  3 × 105 
C)  3 × 106 
D)  3 × 107 
E)  3 × 108

Question 20

A transverse wave is traveling on a string stretched along the horizontal x-axis.The equation for the vertical displacement y of the string is given by y = 0.0020 cos[π(15x - 52t)],where all quantities are in
SI units.The maximum speed of a particle of the string is closest to

Accepted Answer

A)  0.33 m/s. 
B)  0.43 m/s. 
C)  0.53 m/s. 
D)  0.64 m/s. 
E)  0.74 m/s. 
A)  0.33 m/s. 
B)  0.43 m/s. 
C)  0.53 m/s. 
D)  0.64 m/s. 
E)  0.74 m/s.

Exam 1: A: Foundations

The magnetic field at a distance of 2 cm from a current carrying wire is 4 μT.What is the magnetic field at a distance of 4 cm from the wire?

What is the minimum magnitude of an electric field that balances the weight of a plastic sphere of mass 6.4 g that has been charged to -3.0 nC?

An unstable particle is moving at a speed of 2.6 × 108 m/s relative to a laboratory. Its lifetime is measured by a stationary observer in the laboratory to be 4.7 × 10-6 seconds.What is the lifetime of the particle,measured in the rest frame of the particle? (c = 3.00 × 108 m/s)

Which one of the following graphs could possibly represent the vertical position as a function of time for an object in free fall?

At the same moment from the top of a building 3.0 × 102 m tall,one rock is dropped and one is thrown downward with an initial velocity of 10 m/s.Both of them experience negligible air resistance.How much EARLIER does the thrown rock strike the ground?

If the intensity level at distance d of one trombone is 70 dB,what is the intensity level of 76 identical trombones,all at distance d?

The emf and the internal resistance of a battery are as shown in the figure.When the terminal voltage Vab is equal to 17.4 V,what is the current through the battery,including its direction?

The velocity of an object as a function of time is given by v(t)= 2.00 m/s + (3.00 m/s)t - (1.0 m/s2)t2. Determine the instantaneous acceleration of the object at time t = 5.00 s.

Suppose you have two point charges of opposite sign.As you move them farther and farther apart,the potential energy of this system relative to infinity

An object is placed 10 cm from a convex lens of focal length 20 cm.What is the lateral magnification of the object?

Consider a very small hole in the bottom of a tank 20.0 cm in diameter filled with water to a height of 50.0 cm. Find the speed at which the water exits the tank through the hole.

Approximately how many pennies would you have to stack to reach an average 8-foot ceiling?

If the acceleration of an object is negative,the object must be slowing down.

Suppose that a car traveling to the west (the -x direction)begins to slow down as it approaches a traffic light.Which statement concerning its acceleration in the x direction is correct?

In a certain electroplating process gold is deposited by using a current of 14.0 A for 19 minutes.A gold ion,Au+,has a mass of approximately 3.3 × 10-22 g.How many grams of gold are deposited by this process?

Estimate the number of times the earth will rotate on its axis during a human's lifetime.

A transverse wave is traveling on a string stretched along the horizontal x-axis.The equation for the vertical displacement y of the string is given by y = 0.0020 cos[π(15x - 52t)],where all quantities are in SI units.The maximum speed of a particle of the string is closest to

Foundations

Motion in One Dimension

Acceleration

Momentum

Energy

Principle of Relativity

Interactions

Force

Work

Motion in a Plane

Motion in a Circle

Torque

Gravity

Special Relativity

Periodic Motion

Waves in One Dimension

Waves in Two and Three Dimensions

Fluids

Entropy

Energy Transferred Thermally

Degradation of Energy

Electric Interactions

The Electric Field

Gausss Law

Work and Energy in Electrostatics

Charge Separation and Storage

Magnetic Interactions

Magnetic Fields of Charged Particles in Motion

Changing Magnetic Fields

Changing Electric Fields

Electric Circuits

Electronics

Ray Optics

Wave and Particle Optics

Filters

An unstable particle is moving at a speed of 2.6 × 10⁸ m/s relative to a laboratory. Its lifetime is measured by a stationary observer in the laboratory to be 4.7 × 10^-6 seconds.What is the lifetime of the particle,measured in the rest frame of the particle? (c = 3.00 × 10⁸ m/s)

At the same moment from the top of a building 3.0 × 10² m tall,one rock is dropped and one is thrown downward with an initial velocity of 10 m/s.Both of them experience negligible air resistance.How much EARLIER does the thrown rock strike the ground?

The emf and the internal resistance of a battery are as shown in the figure.When the terminal voltage V_ab is equal to 17.4 V,what is the current through the battery,including its direction?

The velocity of an object as a function of time is given by v(t)= 2.00 m/s + (3.00 m/s)t - (1.0 m/s²)t². Determine the instantaneous acceleration of the object at time t = 5.00 s.

In a certain electroplating process gold is deposited by using a current of 14.0 A for 19 minutes.A gold ion,Au⁺,has a mass of approximately 3.3 × 10^-22 g.How many grams of gold are deposited by this process?