Answers350CR Integrated ScienceEnergy Transformations

Energy Transformations Answers

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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.
2
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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
3

What is the basis for analyzing an energy transfer diagram?

A
The mechanical energy input and output must be equal.
B
Heat must always be the largest output.
C
The sum of all outputs must equal the input.
D
Electrical energy is an input but not an output.
4

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.
5

What energy transformation occurs when a skydiver first jumps from a plane?

A
Gravitational potential energy transforms into kinetic energy.
B
Gravitational potential energy transforms into thermal energy.
C
Kinetic energy transforms into gravitational potential energy.
D
Thermal energy transforms into gravitational potential energy.
6

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.
8

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
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

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