Podcast
Questions and Answers
What happens to the kinetic energy if the momentum of an object is doubled?
What happens to the kinetic energy if the momentum of an object is doubled?
- It remains the same.
- It is halved.
- It is doubled.
- It is quadrupled. (correct)
Which formula correctly represents potential energy?
Which formula correctly represents potential energy?
- P.E. = rac{1}{2}MV^2
- P.E. = Mgh (correct)
- P.E. = M imes g imes h
- P.E. = M imes g imes V
If an electric appliance uses 2 kilowatts of power, how many watts is that?
If an electric appliance uses 2 kilowatts of power, how many watts is that?
- 200 watts
- 2000 watts (correct)
- 2,000,000 watts
- 20,000 watts
What is the SI unit of work?
What is the SI unit of work?
Which device transforms mechanical energy into electrical energy?
Which device transforms mechanical energy into electrical energy?
Flashcards
Kinetic Energy Formula
Kinetic Energy Formula
Kinetic energy (K.E.) is the energy of motion. The formula for K.E. is 1/2 * mass * velocity^2
Potential Energy Formula
Potential Energy Formula
Potential energy (P.E.) is stored energy. The formula for P.E. is mass * gravity * height
Momentum and Kinetic Energy
Momentum and Kinetic Energy
Doubling momentum quadruples kinetic energy
Power Formula
Power Formula
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SI Unit of Work
SI Unit of Work
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Power Units
Power Units
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Dynamo Energy Conversion
Dynamo Energy Conversion
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Solar Cell Energy Conversion
Solar Cell Energy Conversion
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Study Notes
Work, Energy, and Power
- Kinetic Energy (K.E.): Energy of motion, calculated as K.E. = 1/2 * m * v² (where m = mass, v = velocity)
- Potential Energy (P.E.): Energy due to position, calculated as P.E. = m * g * h (where m = mass, g = acceleration due to gravity, h = height)
- Relationship between Momentum and Kinetic Energy: Doubling the momentum quadruples the kinetic energy.
- Power: Rate of doing work, calculated as Power = Work / Time, unit is Watt (W)
- Conversion of different types of energy:
- Dynamo: Mechanical energy to electrical energy
- Solar Cell: Solar energy to electrical energy
- Microphone: Sound energy to electrical energy
- Candle: Chemical energy to light and thermal energy
- Loudspeaker: Electrical energy to sound energy
- Lightbulb: Electrical energy to light energy
Units
- 1 kilowatt (kW) = 1000 Watts
- 1 megawatt (MW) = 1,000,000 Watts
- 1 horsepower (hp) = 746 Watts
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