AnswersFL-2003310-Physical Science CRLab: Thermal Energy Transfer

Lab: Thermal Energy Transfer — Unit test Answers

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1
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Which two types of potential energies would be types of mechanical energies?

A
electrical and kinetic
B
nuclear and chemical
C
radiant and thermal
D
elastic and gravitational
2
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Carmen is heating some water and trying to measure the temperature of water using a Celsius thermometer. Which measurement can she expect once the water begins to boil?

A
32°C
B
100° C
C
212°C
D
373°C
3

Simone created a chart to summarize the energy transformations that take place when energy from the wind is used to generate electricity.Which best completes the chart?

Question illustration
A
nuclear energy transformed to electrical energy
B
chemical energy transformed to electrical energy
C
radiant energy transformed to mechanical energy
D
kinetic energy transformed to mechanical energy
4

Seema knows the mass of a basketball. What other information is needed to find the ball’s potential energy?

A
the volume and height the ball reaches
B
the volume and shape of the ball
C
acceleration due to gravity and the height the ball reaches
D
acceleration due to gravity and the shape of the ball
5

Adita lifts a book from the floor, carries it across the room, and places it on a high shelf. When is Adita doing work on the book?

A
She does work on the book at no time during this process.
B
She does work only while she carries the book across the room.
C
She does work from the moment she touches the book until she lets it go.
D
She does work as she picks up the book and as she lifts it to the shelf.
6

What is needed for work to be done?

A
A force must push on an object without moving it.
B
A force must pull on an object without moving it.
C
A force must cause an object to move along the same direction as the force.
D
A force must act on an object while an equal force acts oppositely on the object.
7

When a person strikes and lights a match, potential energy in the match is transformed into which types of energy?

A
electrical and thermal
B
thermal and radiant
C
radiant and nuclear
D
nuclear and kinetic
8

A stovetop burner on medium reaches 95°C. Which will also receive a flow of heat directly from the burner?

A
the surrounding air
B
a burner at the same temperature
C
a pan heated to 100°C
D
hotter water inside a pan
9

Which shows the formula for converting from degrees Celsius to degrees Fahrenheit?

A
°F = (9/5 × °C) +32
B
°F = 5/9 × (°C – 32)
C
°F = °C – 273
D
°F = °C + 273
10

Which set of terms best defines what affects kinetic energy and potential energy, respectively?

A
position, gravity
B
gravity, velocity
C
velocity, height
D
height, position
11

Nuclear reactions in a reactor produce a lot of thermal energy. That energy then flows and warms up water, which boils and produces steam. The steam then turns turbines that generate electricity.

A
Heat flows in the form of electricity.
B
Heat flows from the reactor to the water.
C
The water produces heat.
D
The steam produces heat.
12

When a spring is compressed, the energy changes from kinetic to potential. Which best describes what is causing this change?

A
work
B
power
C
gravitational energy
D
chemical energy
13

Heat transfer between two substances is affected by specific heat and the

A
chemical composition of the substances.
B
state of matter of the substances at room temperature.
C
thermal equilibrium of the substances.
D
amount of time and area of physical contact between the substances.
14

Which of these indicates that a liquid has transferred thermal energy to the air?

A
The liquid increases in temperature, and its particles lose kinetic energy.
B
The liquid decreases in temperature, and its particles gain kinetic energy.
C
The liquid increases in temperature, and its particles gain kinetic energy.
D
The liquid decreases in temperature, and its particles lose kinetic energy.
15

The table shows information about four students who are running around a track. Which statement is supported by the information in the chart?

Question illustration
A
Autumn has more kinetic energy than Chiang.
B
Mohammed has less kinetic energy than Autumn.
C
Lexy has more kinetic energy than Mohammed.
D
Chiang has less kinetic energy than Lexy.
16

A powered winch is used to pull a sailboat to shore. The winch uses a 900 W motor.If the motor is used for 30 s, how much work does it do? (Power: P = W/t)

A
0.03 J
B
30 J
C
960 J
D
27,000 J
17

Which refers to the thermal energy that flows from one substance to another when the substances differ in temperature?

A
heat
B
temperature
C
convection
D
flow
18

If the kinetic and potential energy in a system are equal, then the potential energy increases. What happens as a result?

A
Total energy increases.
B
Stored energy decreases.
C
Energy of motion decreases.
D
Total energy decreases.
19

Which of these results in kinetic energy of an object?

A
position
B
motion
C
mass
D
volume
20

What is the unit of measure for energy?

A
watt
B
newtons
C
joules
D
meters per second

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