Question 1

The graph in the figure shows the position of a particle as a function of time as it travels
along the x-axis.
(a) What is the average speed of the particle between t = 2.0 s and t = 4.0 s?
(b) What is the average velocity of the particle between t = 2.0 s and t = 4.0 s?

Accepted Answer

The answer of The graph in the figure shows the...

Question 2

The figure shows a graph of the position of a moving object as a function of time. What is
the velocity of the object at each of the following times?

Accepted Answer

The answer of The figure shows a graph of the...

Question 3

Which one of the following quantities is the smallest unit of heat energy?

Accepted Answer

A)  calorie 
B)  Btu 
C)  kilocalorie 
D)  joule

Question 4

Two stereo speakers mounted 4.52 m apart on a wall emit identical sound waves. You are standing at the opposite wall of the room at a point directly between the two speakers. You walk 2.11 m
Parallel to the wall, to a location where you first notice that the sound intensity is essentially zero.
If the wall along which you are walking is 10.7 m from the wall with the speakers, what is the
Wavelength of the sound waves? The walls are cushioned to absorb sound reflections.

Accepted Answer

A)  2.05 m 
B)  2.57 m 
C)  1.71 m 
D)  2.91 m

Question 5

When unequal resistors are connected in parallel in a circuit,

Accepted Answer

A)  the largest resistance has the largest current through it. 
B)  the potential drop is always the same across each resistor. 
C)  the same current always runs through each resistor. 
D)  the power generated in each resistor is the same.

Question 6

Suppose that the Department of Energy develops a new reversible engine that has a coefficient of performance (COP) of 4.0 when operated as a refrigerator and a COP of 5.0 when operated as a
Heat pump. What is its thermal efficiency when operated as a heat engine doing work?

Accepted Answer

A)  80% 
B)  20% 
C)  25% 
D)  10% 
E)  45%

Question 7

The gas in a perfectly insulated but flexible container does work at a rate of 13 W. At what rate is the internal (thermal) energy of the gas changing?

Accepted Answer

A)  13 W 
B)  0 W 
C)  6.5 W 
D)  -13 W

Question 8

The intensity level is 65 dB at a distance 5.00 m from a barking dog. What would be a reasonable estimate for the intensity level if two identical dogs very close to each other were barking? You can
Ignore any interference effects.

Accepted Answer

A)  136 dB 
B)  65 dB 
C)  68 dB 
D)  130 dB

Question 9

As a supersonic airplane increases its speed more and more, the half-angle of the conical shock wave

Accepted Answer

A)  decreases. 
B)  increases. 
C)  is not affected.

Question 10

An object is attached to a vertical spring and bobs up and down between points A and B. Where is the object located when its kinetic energy is a maximum?

Accepted Answer

A)  one-third of the way between A and B 
B)  at either A or B 
C)  midway between A and B 
D)  one-fourth of the way between A and B 
E)  at none of the above points

Question 11

A 200-W light bulb is connected across a 110-V dc power supply. What current will flow through this bulb?

Accepted Answer

A)  0.60 A 
B)  0.90 A 
C)  1.8 A 
D)  0 A 
E)  0.36 A

Question 12

A leaky faucet drips 40 times in 30.0 s. What is the frequency of the dripping?

Accepted Answer

A)  0.63 Hz 
B)  1.6 Hz 
C)  0.75 Hz 
D)  1.3 Hz

Question 13

Consider a car that travels between points A and B. The car's average speed can be greater than
the magnitude of its average velocity, but the magnitude of its average velocity can never be
greater than its average speed.

Accepted Answer

A) True 
 B)False

Question 14

An object moves 15.0 m north and then 11.0 m south. Find both the distance it has traveled and the magnitude of its displacement.

Accepted Answer

A)  4.0 m, 4.0 m 
B)  26.0 m, 4.0 m 
C)  26.0 m, 26.0 m 
D)  4.0 m, 26.0 m

Question 15

A ball is projected upward at time t = 0 s, from a point on a flat roof 90 m above the ground. The ball rises and then falls with insignificant air resistance, missing the roof, and strikes the ground.
The initial velocity of the ball is 80.5 m/s. Consider all quantities as positive in the upward
Direction. The vertical velocity of the ball when it is 89 m above the ground is closest to

Accepted Answer

A)  -81 m/s. 
B)  -48 m/s. 
C)  -32 m/s. 
D)  -64 m/s. 
E)  -97 m/s.

Question 16

At the instant a traffic light turns green, a car that has been waiting at the intersection starts ahead with a constant acceleration of 
At that moment a truck traveling with a constant velocity of  15.0 m/s overtakes and passes the car.
(a) Calculate the time necessary for the car to reach the truck.
(b) Calculate the distance beyond the traffic light that the car will pass the truck.
(c) Determine the speed of the car when it passes the truck.

Accepted Answer

The answer of At the instant a traffic light turns...

Question 17

A crane lifts a 2500-kg beam using a steel cable whose mass per unit length is 0.650 kg/m. What is the speed of transverse waves on this cable if the upward acceleration of the beam is a steady 3.00

Accepted Answer

A)  222 m/s 
B)  1880 m/s 
C)  578 m/s 
D)  1220 m/s 
E)  194 m/s

Question 18

The graph in the figure shows the position of a particle as it travels along the x-axis. What
is the magnitude of the instantaneous velocity of the particle when t = 1.0 s?

Accepted Answer

The answer of The graph in the figure shows the...

Question 19

A runner runs around a track consisting of two parallel lines 96 m long connected at the ends by two semicircles with a radius of 49 m. She completes one lap in 100 seconds. What is her average
Velocity?

Accepted Answer

A)  1.3 m/s 
B)  2.5 m/s 
C)  0 m/s 
D)  5.0 m/s 
E)  10 m/s

Question 20

If a tree is 15 m tall, its height expressed in feet is x ft, where x is

Accepted Answer

A)  greater than 15. 
B)  less than 15.

Exam 2: Describing Motion: Kinematics in One Dimension

The graph in the figure shows the position of a particle as a function of time as it travels along the x-axis. (a) What is the average speed of the particle between t = 2.0 s and t = 4.0 s? (b) What is the average velocity of the particle between t = 2.0 s and t = 4.0 s?

The figure shows a graph of the position of a moving object as a function of time. What is the velocity of the object at each of the following times?

Which one of the following quantities is the smallest unit of heat energy?

When unequal resistors are connected in parallel in a circuit,

Suppose that the Department of Energy develops a new reversible engine that has a coefficient of performance (COP) of 4.0 when operated as a refrigerator and a COP of 5.0 when operated as a Heat pump. What is its thermal efficiency when operated as a heat engine doing work?

The gas in a perfectly insulated but flexible container does work at a rate of 13 W. At what rate is the internal (thermal) energy of the gas changing?

The intensity level is 65 dB at a distance 5.00 m from a barking dog. What would be a reasonable estimate for the intensity level if two identical dogs very close to each other were barking? You can Ignore any interference effects.