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Which would increase the speed of a sound wave?

A
A wave passes from a liquid to a gas while remaining the same temperature.
B
A wave passes from a solid to a liquid while remaining the same temperature.
C
The medium increases in temperature while remaining in the same phase.
D
The medium decreases in temperature while remaining in the same phase.
22
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Based on the concept of the global conveyor belt, what happens to ocean water as it moves from Antarctica to the equator?

A
It becomes more dense and sinks to the ocean bottom.
B
It transfers thermal energy to the area, warming the equatorial waters.
C
It becomes less dense and rises to the surface.
D
It transfers thermal energy to deeper layers of the ocean.
23

Which is the best example of the law of conservation of energy?

A
A rolling skateboard slows down because some of its kinetic energy changes to heat.
B
A falling book hits the ground and all of its energy is destroyed.
C
A toy car gains speed as it moves down a ramp because the ramp creates energy.
D
A basketball stops bouncing because its energy disappears.
24

Which is one characteristic shared by electromagnetic and mechanical waves?

A
Both occur as a result of a disturbance.
B
Both are formed by charged particles.
C
Both move due to particles bumping into each other.
D
Both have a frequency and amplitude.
25

Two football players are running toward each other. One football player has a mass of 105 kilograms and is running at 8.6 meters per second The other player has a mass of 90 kilograms and is running at 9.0 meters meters per second What is the momentum of the system after the football players collide?

A
810 kilograms times m over s .
B
903 kilograms times m over s .
C
93 kilograms times m over s .
D
1 comma 713 kilograms times m over s .
26

Which object reflects light with the longest wavelength?

A
a green leaf
B
a yellow book
C
a violet flower
D
a blue paper
27

Plants appear green because they do not absorb the green wavelengths of light. What happens to those green light waves when they hit a plant?

A
They are refracted.
B
They are absorbed.
C
They are reflected.
D
They are diffracted.
28

Farah is doing an experiment that involves calculating the speed of a longitudinal wave. What will most likely happen if she increases the temperature in the room?

A
The amplitude of the wave will increase.
B
The amplitude of the wave will decrease.
C
The speed of the wave will decrease.
D
The speed of the wave will increase.
29

An object is moving north at a constant speed. A force of 5 N begins to push the object east at the same moment that a force of 5 N begins to push it west. What will happen to the object?

A
The object will turn toward the west.
B
The object will continue moving north.
C
The object will slow down and stop.
D
The object will accelerate toward the east.
30

Which best compares radiation and conduction?

A
Both transfer thermal energy by electromagnetic waves.
B
Both transfer thermal energy from warm objects to cooler objects.
C
Both involve the transfer of energy through direct contact.
D
Both can transfer energy through empty space.
31

A car has a mass of 1 comma 200 kilograms What is its acceleration when the engine exerts a force of 600 cap n ? (Formula: F=ma )

A
600 the fraction with numerator m and denominator s squared
B
1 comma 800 the fraction with numerator m and denominator s squared
C
0.5 m/s2
D
2 the fraction with numerator m and denominator s squared
32

At which temperature does water have particles with a greater average kinetic energy than water with a temperature of 30 times degree C ?

A
77 times degree F
B
280 cap k
C
300 cap k
D
95 times degree F
33

A flashlight uses the chemical energy stored in a battery. This chemical energy is eventually converted into which two forms of energy?

A
nuclear and electrical
B
thermal and mechanical
C
mechanical and nuclear
D
radiant and thermal
34

Luz, who is skydiving, is traveling at terminal velocity with her body parallel to the ground. She then changes her body position to feet first toward the ground. What happens to her motion?

A
She will continue to fall at the same terminal velocity because gravity has not changed.
B
She will slow down because the air resistance will increase and be greater than gravity.
C
She will speed up because air resistance will decrease and be less than gravity.
D
She will begin to fall in free fall because she will have no air resistance acting on her.
35

When a baseball player catches a baseball, the glove "gives" or moves backward. How does this movement affect the change in momentum of the baseball?

A
The change in momentum increases because the impact time increases.
B
The change in momentum stays the same because the ball still comes to a stop.
C
The change in momentum decreases because the force decreases.
D
The change in momentum depends on the initial speed of the ball and the time to stop.
36

Which is most likely to get hot fastest when touching a warm surface?

A
copper wire
B
wooden spoon
C
plastic button
D
foam cup
37

A probe is launched from Earth and lands on Mars. The gravitational acceleration on Mars is 3 point 7 m/s squared Which statement best compares the mass and weight of the probe?

A
The mass of the probe decreases, but the weight of the probe remains the same.
B
The mass of the probe increases, but the weight of the probe remains the same.
C
The mass of the probe remains the same, but the weight of the probe increases.
D
The mass of the probe remains the same, but the weight of the probe decreases.
38

Which best explains why a black T-shirt gets warmer in the Sun than a white T-shirt?

A
Darker colors absorb more energy from electromagnetic waves than lighter colors do.
B
Darker colors reflect more energy from electromagnetic waves than lighter colors do.
C
Darker colors absorb more energy from colliding particles than lighter colors do.
D
Darker colors reflect more energy from colliding particles than lighter colors do.
39

Pravat exerts a force of 30 cap n to lift a bag of groceries 0 point 5 m How much work did Pravat do on the bag? Note : Work is equal to Force times Distance

A
60 cap j
B
30 cap j
C
15 cap j
D
0 cap j
40

What is the potential energy of a 25 kilograms bicycle resting at the top of a hill 3 m high? (Formula: cap p cap e is equal to mg h )

A
245 cap j
B
75 cap j
C
37 point 8 cap j
D
735 cap j

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