AnswersFL-2002070-MJ Comprehensive Science 2Energy Transformations

Temperature and Thermal Energy Answers

0 verified answers
1
Free Preview

When Javier touches a hot mug of tea, energy is transferred from the surface of the mug to his hand. What kind of energy is this?

A
nuclear
B
radiant
C
thermal
D
chemical
2
Free Preview

Which is occurring when work is being done?

A
Energy is being reverted.
B
Energy is being decreased.
C
Energy is being increased.
D
Energy is being transferred.
3

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
4

As a person pushes a box across a floor, the energy from the person’s moving arm is transferred to the box, and the box and the floor become warm. During this process, what happens to energy?

A
It is increased.
B
It is conserved.
C
It is decreased.
D
It is created.
5

What is the source of almost all energy on Earth?

A
Earth’s hot core
B
the Sun
C
stored carbon
D
moving water
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

Which statement describes how a machine can help make work easier?

A
It can put out more force than the input force by decreasing the distance over which force is applied.
B
It can increase the amount of work performed if the output force is in the same direction as the input force.
C
It can apply a greater output force over a greater distance compared to the input force and distance.
D
It can increase the distance over which output force acts by applying less output force than input force.
8

How does using a ramp make work easier when loading a piano onto a truck three feet above the ground?

A
It allows a larger force to be applied over a shorter distance.
B
It allows a larger force to be applied over a longer distance.
C
It allows a smaller force to be applied over a shorter distance.
D
It allows a smaller force to be applied over a longer distance.
9

A wheelbarrow can be used to help lift a load, such as a pile of dirt, and then push the load across a distance.

Question illustration
A
a pulley and an inclined plane
B
a wheel and axle and a lever
C
a pulley and a wheel and axle
D
a lever and a wedge
10

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.
11

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.
12

What is the mechanical advantage of a pulley that changes only the direction of the load, not the effort force?

A
0.5
B
1.0
C
1.5
D
2.0
13

Which term is the product of force and distance?

A
power
B
work
C
net force
D
acceleration

Did you find these answers helpful?

More from this Course

Quiz
24 verified answers

Unit Test

Instruction
15 verified answers

Unit Test

Quiz
10 verified answers

Energy Transformations