Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Physics > Energy Transfer > Flashcards

Energy Transfer Flashcards

You may prefer our related Brainscape-certified flashcards:
Physics 101 flashcards AP® Physics flashcards
0
Q

Global warming may lead to ‘higher maximum temperatures and more hot days over all land areas.’ Give examples of four possible consequences of this change.

A
  • Draught
  • Poor crops, lack of food
  • Increased spread of disease
  • Rivers dry up
  • Ice caps melt
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
1
Q

A bicycle has a kinetic energy of 124J. What kinetic energy would the bicycle have if it had twice the mass but was moving at the same speed?

A

248J

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

A bicycle has a kinetic energy of 124J. What kinetic energy would the bicycle have if it had half the mass and was moving at twice the speed?

A

248J

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Power (Watts) =

A

Power (Watts) = work done (J) / time taken (s)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

A Watt is the standard metric of work. True or false?

A

False, Watt is the unit for power, Joule is for energy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Ceres is the largest and most massive asteroid in the asteroid belt, having an estimated mass of 3 x 10^21 kg and an orbital speed of 17900m/s. Determine the amount of kinetic energy.

A

4.8 x 10^29

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Lost disadvantages of renewable energy resources

A
  • Unsightly
  • Disrupt habitats
  • Expensive to maintain
  • Sometime hard to access
  • Small output
  • Dependant on the weather
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

If person A and person B do the same job but person B does it faster, then person A does more work but person B has more power. True or false?

A

False, if two people do the same job, then they’re doing the same amount of work. The person who does it fastest generates more power.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What are the energy transfers involved in generating electricity using nuclear power?

A

Nuclear (Uranium) -> Kinetic (products of fission) -> Thermal (friction of movement) -> Thermal (coolant) -> Thermal (boiler) -> Kinetic (steam) -> Kinetic (turbine) -> Electrical (generator)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

In a fossil fuel power station energy is released by _______ the fossil fuel (coal etc)

A

Burning

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Global warming may lead to ‘more intense precipitation events (rain, snow hail).’ Give examples of four possible consequences of this change.

A
  • Flooding
  • Loss of land for living / growing crops
  • Famine
  • Spread of disease
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What are the energy transfers involved in generating electricity using water?

A

GPE (water at top of waterfall) -> Kinetic (turbine) -> Electrical (generator)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

List advantages of non renewable energy resources

A
  • Cheap to run
  • Reliable
  • High output
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What are the energy transfers involved in generating electricity using geothermal?

A

Thermal (ground) -> Thermal (water) -> Kinetic (steam) -> Kinetic (turbine) -> Electrical (generator)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Fossil fuel power stations release lots of _____ _____ as a waste product. This is a ____ gas.

A

Carbon dioxide

Greenhouse

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is the equation for the efficiency of an appliance?

A

Efficiency = useful energy output
————————–
total energy input

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is the unit for work?

A

Joules, J

17
Q

What are the energy transfers involved in generating electricity using fossil fuels?

A

Chemical potential energy (coal) -> Thermal (furnace) -> Kinetic (steam) -> Kinetic (turbine) -> Electrical (generator)

18
Q

What is the equation used to calculate the energy transferred when a device is turned on?

A

Energy transferred or work done = Power x Time

19
Q

List disadvantages of nuclear energy

A
  • Dangerous if goes wrong

- Radioactive waste needs safe storage for thousands of years

20
Q

What are the energy transfers involved in generating electricity using solar cells?

A

Light (sun) -> Electric (cells)

21
Q

Nuclear power stations produce ______ waste

A

Radioactive

22
Q

Calculate the work done by a man pushing a car 25m along a road if he pushes with a force of 600N

A

Work done = Force x Distance

15000J

23
Q

An 800N man climbs 5m up a ladder. How much gravitational potential energy does he gain?

A

4000J

24
Q

Energy is never _____ nor _____ but is always ______

A

Created nor destroyed

Conserved

25
Q

A flowerpot weighing 5N falls off a windowsill 10m above the ground. What is its kinetic energy just before it hits the ground? What is the average speed as it falls?

A

50J

14.14m/s

26
Q

What are the energy transfers involved in generating electricity using solar heating?

A

Thermal (sun) -> Thermal (water)

27
Q

List disadvantages of non renewable energy resources

A
  • Running out
  • Mining disrupts habitats
  • Polluting (greenhouse gases, acid rain)
28
Q

Power is the rate of

A

Energy transfer (or doing work)

29
Q

List advantages of renewable energy resources

A
  • No polluting gases
  • Free resources
  • Will not run out of wind or waves!
30
Q

List the nine forms of energy

A
  • Thermal
  • Light
  • Sound
  • Kinetic
  • Electrical
  • Chemical
  • Nuclear
  • Elastic potential
  • Gravitational potential
31
Q

What is the kinetic energy of a 2kg dog running at 6m/s?

A

36J

32
Q

List advantages of nuclear energy

A
  • Relatively cheap to run
  • No polluting gases
  • High output
33
Q

Some people apply a cumulative force of 1080N to push the car 218m to the nearest fuel station. Determine the work done on the car

A

235000J

34
Q

A motor exerts an average force of 890N to push large crates a distance of 12 meters in 22 seconds. Determine the power output required of such a motor. (Find work done first)

A

485W

35
Q

A bicycle has a kinetic energy of 124J. What kinetic energy would the bike have if it had the same mass and was moving with half the speed?

A

31J

36
Q

A bicycle has a kinetic energy of 124J. What kinetic energy would the bike have if it had twice the mass and was moving with twice the speed?

A

496J

37
Q

A bicycle has a kinetic energy of 124J. What kinetic energy would it have if it had three times the mass and was moving at half the speed?

A

93J

38
Q

What is the gravitational field strength on Earth?

A

10N/kg

39
Q

Determine the work done in dead lifting 300kg to a height of 0.9m above the ground

A

2700J

40
Q

What are the energy transfers involved in generating electricity using wind?

A

Kinetic (wind) -> Kinetic (blades) -> Electrical (generator)

Physics (8 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions