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Cumulative Exam — Cumulative exam Answers

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Which best explains why Greg’s hands get warm as he holds a bowl of hot soup?

A
Heat energy is created from the thermal energy in Greg’s hands.
B
Heat energy is absorbed by the soup from Greg’s hands.
C
Thermal energy from the soup moves to Greg’s hands.
D
Thermal energy from the surrounding air moves to Greg’s hands.
42
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Which best explains why a black T-shirt gets warmer in the Sun than a white T-shirt?

A
Darker colors reflect more energy from colliding particles than lighter colors do.
B
Darker colors absorb more energy from colliding particles than lighter colors do.
C
Darker colors reflect more energy from electromagnetic waves than lighter colors do.
D
Darker colors absorb more energy from electromagnetic waves than lighter colors do.
43

On a test, Helena is defining energy. Which must she include in order to get her answer marked correct?

A
making objects more compact
B
the ability to do work
C
carrying through matter and space
D
the bonds of atoms
44

Incisors (front teeth) act as wedges in the human body. Which change would increase the mechanical advantage of incisors?

A
a decrease in the distance of the teeth from the fulcrum
B
an increase in the distance of the teeth from the fulcrum
C
an increase in the thickness at the widest part of the teeth and no change in the length of the teeth
D
an increase in the length of the teeth and no change in the thickness at the widest part of the teeth
45

The thermal energy in a hot iron flows into a shirt. What can possibly be said about this situation?

A
The iron is warmer than the shirt.
B
The iron has less energy than the shirt.
C
The iron is 92°C and the shirt is 96°C.
D
The iron has less heat than the shirt.
46

What is the kinetic energy of a toy truck with a mass of 0.75 kg and a velocity of 4 m/s? (Formula: )

Question illustration
A
3 J
B
6 J
C
12 J
D
24 J
47

Which best describes a difference between electric current and static electricity?

A
Electric current is continuous, and static electricity is not continuous.
B
Static electricity is continuous, and electric current is not continuous.
C
Electric current involves the movement of electrons, and static electricity involves the movement of protons.
D
Static electricity involves the movement of electrons, and electric current involves the movement of protons.
48

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

A
foam cup
B
wooden spoon
C
copper wire
D
plastic button
49

The metal aluminum coils in an air conditioner conduct thermal energy from inside the house and release it outside the house. What can be said about the coils when they are accepting the heat inside the house?

A
They must be warmer than the air inside the house.
B
They must be cooler than the air inside the house.
C
They must have more thermal energy than the air inside the house.
D
They must be more insulated than the air inside the house.
50

If 600 J of work is done in 3 s, what is the power? (Power: P = W/t)

A
0.005 W
B
200 W
C
603 W
D
1800 W

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