Answers350CR Integrated ScienceEnergy Transformations

Energy Transformations Answers

16 verified answers
1
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The image shows a pendulum that is released from rest at point A.

Question illustration
A
A: Maximum kinetic energyC: Maximum gravitational potential energy
B
B: Maximum kinetic energyD: Maximum gravitational potential energy
C
A: Maximum gravitational potential energyC: Maximum kinetic energy
D
B: Maximum gravitational potential energyD: Maximum kinetic energy
2
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Which statement best describes what energy transfer diagrams show?

A
Energy can change form, but the total amount of energy stays the same.
B
Every energy transformation results in a reduction of energy.
C
Energy transformations result in fewer types of energy.
D
Each type of energy can change into one other type of energy.
3

If no energy is lost due to friction, which statements about the energy of the ball are true? Check all that apply.

A
The potential energy at the top of the ball’s motion is 18 J.
B
The kinetic energy is less when the ball is thrown than when it is caught.
C
The kinetic energy increases as the potential energy decreases.
D
The kinetic energy decreases as the potential energy increases.
E
The total mechanical energy of the ball stays constant.
F
The mechanical energy decreases as the ball moves up and increases as the ball comes down.
4

Which energy transformations occur when a candle burns?

A
Thermal energy transforms into mechanical energy and radiant energy.
B
Chemical energy transforms into thermal energy and electrical energy.
C
Thermal energy transforms into radiant energy and chemical energy.
D
Chemical energy transforms into thermal energy and radiant energy.
5

Energy can be changed from one form to another. Which terms can be used to describe these changes? Check all that apply.energy conversionenergy conservationenergy correlationenergy transformationenergy transference

A
energy conversion
B
energy conservation
C
energy correlation
D
energy transformation
E
energy transference
6

A toy plane has a mass of 2.5 kg and is 18 m above the ground. It is moving at 4.5 m/s.

A
416 J
B
441 J
C
466 J
D
491 J
7

Tracy makes a list of energy transformations that occur as an engine runs to power a car.1. Chemical energy transforms into thermal energy.2. Thermal energy transforms into electrical energy.3. Chemical energy transforms into gravitational potential energy.4. Thermal energy transforms into kinetic energy.

A
1
B
2
C
3
D
4
8

A bird has a kinetic energy of 3 J and a potential energy of 25 J. What is the mechanical energy of the bird?

A
3 J, because mechanical energy is the same as kinetic energy
B
22 J, because mechanical energy is the difference of the potential energy and kinetic energy
C
25 J, because mechanical energy is the same as potential energy
D
28 J, because mechanical energy is the sum of the potential energy and kinetic energy
9

Which equation shows the correct relationship between mechanical energy, kinetic energy, and potential energy?

A
ME = KE + PE
B
ME + KE = PE
C
ME = KE – PE
D
ME + PE = KE
10

Which of these changes would make the diagram error-free? Check all that apply.

A
reducing the amount of thermal energy to 475 J
B
increasing the amount of electrical energy to 825 J
C
increasing the amount of sound energy to 225 J
D
reducing the amount of kinetic energy to 50 J
E
reducing the amount of electrical energy to 675 J
11

The image shows a pendulum that is released from rest at point A. Shari tells her friend that no energy transformation occurs as the pendulum swings between point B and point D.

Question illustration
A
She could agree with Shari because the pendulum is at the same height and would have the same gravitational potential energy at both positions.
B
She could agree with Shari because the pendulum has the same amount of mechanical energy throughout its swing.
C
She could disagree with Shari because the pendulum converts kinetic energy into gravitational potential energy, then back into kinetic energy.
D
She could disagree with Shari because the pendulum converts gravitational potential energy into kinetic energy, then back into gravitational potential energy.
12

A blender takes in 180 J of electrical energy. Of the 180 J, 90 J are transformed into kinetic energy, 60 J are transformed into thermal energy, and the rest is transformed into sound.

A
30 J
B
90 J
C
150 J
D
330 J
13

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Answer not available
14

A baseball has a mass of 0.145 kg and is 12 m above the ground. If it has a mechanical energy of 105.8 J, how fast is it moving?

A
17 m/s
B
35 m/s
C
89 m/s
D
130 m/s
15

What is the sequence of energy transformations associated with a hydroelectric dam?

A
electrical energy into mechanical energy into kinetic energy into gravitational potential energy
B
gravitational potential energy into kinetic energy into mechanical energy into electrical energy
C
chemical energy into kinetic energy into mechanical energy into electrical energy
D
chemical energy into thermal energy into kinetic energy into electrical energy
16

Which best describes how energy changes form in a car’s engine?

A
A single transformation occurs because the chemical energy of the fuel is changed to the mechanical energy of the car.
B
A single transformation occurs because the mechanical energy of the car originates from one spark.
C
Multiple transformations occur because the chemical energy of the fuel is changed to several forms of energy.
D
Multiple transformations occur because the chemical energy of the fuel must be replenished to keep the car running.

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