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P1 Energy

Posljednje ažuriranje 3 days ago

40

4.1.1.1 Energy Stores and systems

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4.1.1.2 Changes in energy

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4.1.1.3 Energy changes in systems

4.1.1.4 Power

4.1.2.1 Energy transfers in a system

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4.1.2.2 Efficiency

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4.1.3 National and global resources

Pitanje 1

1.

What is the unit of energy?

Joule

Watt

metres per second

Kilogram

Pitanje 2

2.

Which will have the higher value in its kinetic energy store?

A cyclist at 15 m/s

A car at 15 m/s

A bus at 15 m/s

A freight train at 15 m/s

Pitanje 3

3.

What is the name for the store of energy that we associate with foods?

Internal energy store

Thermal energy store

Chemical energy store

Pitanje 4

4.

Which will have the most gravitational potential energy?

A person stood on a box

A person parachuting from a skyscraper

A person on the back of a horse

A person stood on a house

Pitanje 5

5.

From you equation sheet, which equation is for Gravitational Potential Energy?

Ee = 1/2ke²

Ep = mgh

Ek = 1/2mv²

1

Pitanje 6

6.

Of the objects shown, which one(s) do not have energy in their kinetic energy stores?

A

B

C

D

4.1.1.1

Pitanje 7

7.

An athlete is sprinting. When they are doing this, they have 400 J in their kinetic energy store. How will the number of joules in their kinetic energy store be different if they slow down to walking pace?

More than 400J

Exactly 400J

Less than 400J

Pitanje 8

8.

What happens to the chemical energy store within a fuel as it is used?

Increases

Decreases

No change

Pitanje 9

9.

The battery in a torch has 20J of chemical energy store when it is full. 5J is transferred from the battery. How much is left?

20

15

5

Pitanje 10

10.

What energy store is involved when objects heat up or cool down?

Chemical

Kinetic

Thermal

Internal

Pitanje 11

11.

What energy store is involved in fuels, food and batteries?

Thermal

Chemical

Internal

Kinetic

Pitanje 12

12.

How is energy moved between energy stores?

Transfer

Loss

Floating

Magic

Pitanje 13

13.

Which thermal energy store has changed the most in the following?

1 kg of water heated up by 10°C

1 kg of water heated up by 50°C?

Pitanje 14

14.

Which thermal energy store has changed the most in the following?

20 g of wax heated up by 1°C

20 g of wax heated up by 2°C?

Pitanje 15

15.

A speaker has 95J of kinetic energy. 6J of energy is dissipated as heat, how much energy is transferred by radiation into sound?

95J

89J

101J

Pitanje 16

16.

A speaker has 95J of kinetic energy. 6J of energy is dissipated as heat, the rest is transferred by radiation into sound. Name the useful energy transfer

Kinetic Energy

Dissipated as Heat

Transferred by radiation into sound

Pitanje 17

17.

A speaker has 95J of kinetic energy. 6J of energy is dissipated as heat, the rest is transferred by radiation into sound. Name the wasted energy transfer

Kinetic Energy

Dissipated as Heat

Transferred by radiation into sound

Pitanje 18

18.

If a transfer has an efficiency of 0.75, we can also write this as being __% efficient.

25 %

75 %

0.75%

7.%%

Pitanje 19

19.

A kettle uses 63J of energy and it produces 58J of heat, what is the efficiency of the kettle in a decimal?

Pitanje 20

20.

What is the efficiency of a phone if it uses 31J and wastes 19J of energy as a percentage?

Pitanje 21

21.

How much energy does a toaster use if the efficiency is 0.40 and it produces 30J of heat energy?

Pitanje 22

22.

If 100 J is input and 30 J is useful, what is energy loss?

70 J

100 J

30 J

60 J

Pitanje 23

23.

With 200 J input and 50 J useful, what is energy loss?

100 J

150 J

50 J

200 J

Pitanje 24

24.

If 250 J input gives 75 J useful, what is the waste?

100 J

175 J

75 J

250 J

Pitanje 25

25.

Input energy of 400 J, and output energy is 150 J, loss?

300 J

250 J

400 J

150 J

Pitanje 26

26.

With 500 J input and 200 J useful, energy loss is?

200 J

150 J

500 J

300 J

Pitanje 27

27.

If 600 J input produces 180 J useful, energy lost?

180 J

300 J

420 J

600 J

Pitanje 28

28.

Input of 350 J, useful output 100 J, what’s lost?

350 J

200 J

100 J

250 J

Pitanje 29

29.

With 800 J input and 350 J useful, energy loss is?

350 J

450 J

800 J

300 J

Pitanje 30

30.

If you have 900 J input and 400 J useful, loss?

300 J

400 J

900 J

500 J

Pitanje 31

31.

If the input energy is 100 J and useful energy is 30 J, what is the efficiency?

100%

30 J

70%

30%

Pitanje 32

32.

Input energy is 200 J, and useful energy is 50 J. What is the efficiency?

75%

50%

200 J

25%

Pitanje 33

33.

An engine has 120 J input energy and 60 J useful work. Calculate the efficiency.

120 J

50%

60%

25%

Pitanje 34

34.

If the input energy is 150 J and the useful energy is 120 J, what efficiency does it have?

80%

120 J

20%

150%

Pitanje 35

35.

With an input energy of 80 J and useful energy of 20 J, find the efficiency.

50%

80%

25%

20%

Pitanje 36

36.

For 300 J input and 240 J useful energy, what's the efficiency?

20%

80%

300 J

240%

Pitanje 37

37.

A device uses 400 J input energy and outputs 100 J usable energy. What is the efficiency?

100%

75%

25%

400%

Pitanje 38

38.

Calculate efficiency for 60 J input energy with 15 J useful energy.

25%

60%

40%

15 J

Pitanje 39

39.

Input energy is 500 J with useful energy as 250 J. What's the efficiency?

50%

25%

250%

500 J

Pitanje 40

40.

An appliance uses 1000 J input and provides 500 J useful energy. Find the efficiency.

25%

100%

50%

500%