AnswersGA-GSE Physical Science BIntroduction to Machines

Introduction to Machines — Unit test Answers

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Which will reduce the possible environmental damage associated with mining uranium?

A
installing newer water recycling systems in older power plants
B
increasing the reprocessing of used fuel for reuse
C
building additional fission nuclear power plants
D
developing better places to store radioactive wastes
2
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Which compares the problems associated with radioactive waste created from generating electricity using fusion reactions to waste created from generating electricity using fission reactions?

A
The radioactive waste from fusion reactions becomes less hazardous much sooner than the waste from fission reactions.
B
The radioactive waste from fission reactions becomes less hazardous much sooner than the waste from fusion reactions.
C
Although their radioactive wastes are hazardous for the same period of time, fusion reactions produce less waste than fission reactions.
D
Although their radioactive wastes are hazardous for the same period of time, fission reactions produce less waste than fusion reactions.
3

Doug is doing work. Without knowing exactly what he is doing, which can be said about the work he is doing?

A
Energy is transferred.
B
Energy is increased.
C
Energy is decreased.
D
Energy is unchanged.
4

Which best defines energy?

A
a type of wave that carries energy through space, where there is almost no matter
B
a disturbance that carries energy form one place to another through matter and space
C
the ability to do work
D
pressing to make more compact
5

The total energy in a system is 675 J. The kinetic energy changes from 296 J to 432 J. Which statement best describes the potential energy of this system?

A
It changes from 296 J to 432 J.
B
It changes from 379 J to 243 J.
C
It changes from 432 J to 296 J.
D
It changes from 243 J to 379 J.
6

Mateo’s parents are thinking about investing money to help develop a new fusion power plant. Which issue is most important to consider before making the investment?

A
Fusion has never been controlled, so how have they succeeded in doing it?
B
The fuel is quite limited, so have they discovered a more common fuel?
C
Fusion has been generating electricity for decades, so why build another fusion power plant?
D
Fusion requires high temperatures and pressures, so how have they reduced the energy cost for it?
7

Under which condition is no work done?

A
A force pushes an object and slows it down.
B
A force pulls an object and speeds it up.
C
A force pulls down on an object that moves downward.
D
A force pushes up on an object that stays in place.
8

Two examples of energy transformations are shown.

Question illustration
A
begin with chemical energy.
B
begin with electrical energy.
C
result in radiant energy.
D
result in mechanical energy.
9

Which best describes a difference between energy transformations in power plants and dams?

A
Only power plants use fossil fuels to transform energy.
B
Only dams use fission to generate thermal energy.
C
Only power plants use water to turn turbines.
D
Only dams use mechanical energy to produce electricity.
10

A 4400 W motor is used to do work. If the motor is used for 200 s, how much work could it do? (Power: P = W/t)

A
22 J
B
4200 J
C
4600 J
D
880,000 J
11

Dimas reads that it takes 270 N to lift a firefighter’s equipment. If a firefighter does 5400 J of work carrying the equipment up a staircase, how high does the firefighter climb? (Work: W = Fd)

A
20 m
B
200 m
C
5130 m
D
1,458,000 m
12

What is the overall energy transformation in a coal-fired power plant?

A
electrical to chemical
B
chemical to electrical
C
nuclear to radiant
D
radiant to nuclear
13

Wapi collected data about four machines and listed it in this table. Which machine has the greatest output force?

Question illustration
A
A
B
B
C
C
D
D
14

Ryan is examining the energy of the particles in a bar of gold. What is Ryan most likely studying?

A
thermal energy
B
electric energy
C
potential energy
D
internal energy
15

Hedea made a study chart about nuclear energy.Which best describes the error in Hedea’s chart?

Question illustration
A
The nuclei of atoms are split apart in both fission and fusion.
B
The nuclei of atoms are joined together in both fission and fusion.
C
Fission converts nuclear energy to electrical energy, not thermal energy.
D
Fission and fusion convert nuclear energy to both radiant and thermal energy.

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