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Practice Exam Answers

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21
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How much thermal energy is generated?

A
7000 J
B
2000 J
C
15,000 J
D
1000 J
22
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A 150 g egg is dropped from 3 point 0 meters. The egg is moving at 4.4 meters per second right before it hits the ground. The egg comes to a stop in 0 point 0 7 2 seconds. What is the magnitude of force that the ground exerted on the egg?

A
0 point 6 6 cap n
B
180 cap n
C
9 point 2 cap n
D
13 cap n
23

A boy is running to the east and jumps into a stationary boat in a lake. Once the boy lands in the boat, the boat moves to the east. Which best compares the initial momentum of the boy with the final momentum of the boy/boat system?

A
The initial momentum of the boy is equal to the boy/boat because the final velocity of the boat is less than the initial velocity of the boy.
B
The initial momentum of the boy is less than the boy/boat because the boy has less mass than the boat.
C
The initial momentum of the boy is greater than the boy/boat because the boy has a greater velocity than the boat.
D
The initial momentum of the boy is zero because the velocity cancels with the mass of the boy.
24

A vertical spring with a spring constant value of 4500 cap n over m is compressed 60 centimeters A 5 point 5 kilograms pumpkin is placed on the end of the spring, and the spring is released. To the nearest whole number, the pumpkin will rise [Dropdown 1] m

Answer:

15

25

What is the main difference between a longitudinal wave and a transverse wave?

A
A longitudinal wave always travels faster than a transverse wave.
B
A transverse wave is made of particles that move perpendicular to the motion of the wave.
C
A longitudinal wave does not need a medium to travel through.
D
A transverse wave always carries more energy so that it can travel through empty space.
26

Suppose an object’s initial velocity is 10 meters per second and its final velocity is 4 meters per second Mass is constant. What can best be concluded about the object based on the work-energy theorem?

A
Work is negative, the environment did work on the object, and the energy of the system decreases.
B
Work is negative, the object did work on the environment, and the energy of the system decreases.
C
Work is positive, the object did work on the environment, and the energy of the system increases.
D
Work is positive, the environment did work on the object, and the energy of the system increases.
27

A cyclist rides at a constant speed of 4 point 5 m/s around a curve. If the centripetal acceleration is 29 m/s squared , what is the radius of the curve?

A
0 point 7 0 m
B
6 point 4 m
C
34 m
D
0 point 1 6 m
28

If a 4 point 5 kilograms object is dropped from a height of 6 point 0 m , what will be its velocity when it is halfway toward the ground? (Use g is equal to 9 point 8 0 the fraction with numerator m and denominator s squared , and ignore air resistance.)

A
7.7 meters per second
B
11 meters per second
C
29 meters per second
D
16 meters per second
29

Which best compares the vertical motion of the two balls?

A
Both balls are acted on by gravity and are accelerating downward.
B
Both balls have constant velocity and are acted on by gravity.
C
Both balls have zero acceleration and have constant velocity.
D
Both balls are pulled downward and have zero acceleration.

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