Question 1

In simple harmonic motion, when is the magnitude of the acceleration the greatest? (There could be more than one correct choice.)

Accepted Answer

A)  when the displacement is a zero 
B)  when the potential energy is a maximum 
C)  when the kinetic energy is a minimum 
D)  when the speed is a maximum 
E)  when the magnitude of the displacement is a maximum

Question 2

The wavelengths of the sounds produced by two horns are 6.0 m and 7.0 m, respectively. What beat frequency is heard when the horns are sounded on a day when the speed of sound is 340
M/s?

Accepted Answer

A)  7 Hz 
B)  5 Hz 
C)  6 Hz 
D)  8 Hz

Question 3

A ball is thrown straight upward from ground level with a speed of 18 m/s. How much time passes before the ball strikes the ground if we disregard air resistance?

Accepted Answer

A)  1.8 s 
B)  0.6 s 
C)  3.7 s 
D)  1.1 s

Question 4

The water pressure to an apartment is increased by the water company. The water enters the apartment through an entrance valve at the front of the apartment. Where will the increase in the
Static water pressure be greatest when no water is flowing in the system?

Accepted Answer

A)  at a faucet close to the entrance valve 
B)  at a faucet far from the entrance valve 
C)  It will be the same at all faucets. 
D)  There will be no increase in the pressure at the faucets.

Question 5

A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km east, and then 1.0 km north to return to its starting point. This trip takes 45 min. What was the bear's average velocity?

Accepted Answer

A)  0.00 km/h 
B)  4.0 km/h 
C)  0.067 km/h 
D)  5.3 km/h

Question 6

A rock from a volcanic eruption is launched straight up into the air with no appreciable air resistance. Which one of the following statements about this rock while it is in the air is correct?

Accepted Answer

A)  The acceleration is downward at all points in the motion except that is zero at the highest point. 
B)  On the way up, its acceleration is downward and its velocity is upward, and at the highest point both its velocity and acceleration are zero. 
C)  On the way down, both its velocity and acceleration are downward, and at the highest point both its velocity and acceleration are zero. 
D)  The acceleration is downward at all points in the motion. 
E)  Throughout the motion, the acceleration is downward, and the velocity is always in the same direction as the acceleration.

Question 7

The second law of thermodynamics leads us to conclude that

Accepted Answer

A)  it is theoretically possible to convert heat into work with 100% efficiency. 
B)  the average temperature of the universe is increasing with the passage of time. 
C)  disorder in the universe is increasing with the passage of time. 
D)  the total energy of the universe is constant. 
E)  the entropy of the universe remains constant.

Question 8

A 10-kg piece of aluminum sits at the bottom of a lake, right next to a 10-kg piece of lead, which is much denser than aluminum. Which one has the greater buoyant force on it?

Accepted Answer

A)  Both have the same buoyant force. 
B)  the lead 
C)  the aluminum 
D)  It cannot be determined without knowing their volumes.

Question 9

An ideal Carnot engine extracts 529 J of heat from a high-temperature reservoir during each cycle, and rejects 225 J of heat to a low-temperature reservoir during the same cycle. What is the
Efficiency of the engine?

Accepted Answer

A)  0.7 
B)  1.35 
C)  2.35 
D)  0.57

Question 10

Which of the following will increase the capacitance of a parallel-plate capacitor? (There could be more than one correct choice.)

Accepted Answer

A)  a decrease in the potential difference between the plates 
B)  an increase in the charge on the plates 
C)  an increase in the plate area and a decrease in the plate separation 
D)  an increase in the potential difference between the plates 
E)  a decrease in the plate area and an increase in the plate separation

Question 11

Kirchhoff's junction rule is a statement of

Accepted Answer

A)  Newton's second law. 
B)  the law of conservation of charge. 
C)  the law of conservation of angular momentum. 
D)  the law of conservation of momentum. 
E)  the law of conservation of energy.

Question 12

What is the ratio of the intensities of two sounds with intensity levels of 70 dB and 40 dB?

Accepted Answer

A)  100:1 
B)  10,000:1 
C)  10:1 
D)  1000:1

Question 13

A piece of wood is floating in a bathtub. A second piece of wood sits on top of the first piece, and does not touch the water. If the top piece is taken off and placed in the water, what happens to the
Water level in the tub?

Accepted Answer

A)  It does not change. 
B)  It goes up. 
C)  It goes down. 
D)  It cannot be determined without knowing the volumes of the two pieces of wood.

Question 14

A coil of wire containing N turns is in an external magnetic field that is perpendicular to the plane of the coil and it steadily changing. Under these circumstances, an emf  is induced in the coil. If
The rate of change of the magnetic field and the number of turns in the coil are now doubled (but
Nothing else changes), what will be the induced emf in the coil?

Accepted Answer

A)   
B)   
C)   
D)   
E)

Question 15

Two protons are released from rest, with only the electrostatic force acting. Which of the following statements must be true about them as they move apart? (There could be more than one correct
Choice.)

Accepted Answer

A)  Their electric potential energy keeps decreasing. 
B)  Their electric potential energy keeps increasing. 
C)  Their kinetic energy keeps decreasing. 
D)  Their kinetic energy keeps increasing. 
E)  Their acceleration keeps decreasing.

Question 16

In a resonating pipe that is open at one end and closed at the other, there

Accepted Answer

A)  are displacement nodes at each end. 
B)  is a displacement node at the closed end and a displacement antinode at the open end. 
C)  is a displacement node at the open end and a displacement antinode at the closed end. 
D)  are displacement antinodes at each end.

Question 17

What is the peak voltage in an ac circuit where the rms voltage is 120 V?

Accepted Answer

A)  240 V 
B)  84.8 V 
C)  170 V 
D)  120 V

Question 18

If a quantity you calculated has units of Ω · m what is that quantity?

Accepted Answer

A)  resistivity 
B)  potential 
C)  resistance 
D)  capacitance 
E)  charge

Question 19

If your heart is beating at 76.0 beats per minute, what is the frequency of your heart's oscillations in hertz?

Accepted Answer

A)  1450 Hz 
B)  4560 Hz 
C)  2.54 Hz 
D)  3.98 Hz 
E)  1.27 Hz

Question 20

By what primary heat transfer mechanism does the sun warm the earth?

Accepted Answer

A)  radiation 
B)  conduction 
C)  convection 
D)  All of the above processes are equally important in combination.

Exam 2: Describing Motion: Kinematics in One Dimension