Work, Power and Energy

Name the scientist who experimentally verified the law of conservation of energy.

When a body falls freely towards the Earth, then Its total energy:

• Increases

• Decreases

• Remains constant

• First increases then decreases

A 1kg mass has a kinetic energy of 1 joule when it's speed is

• .45 m/s

• 1 m/s

• 1.4 m/s

• 4.4 m/s

Sum of K.E. and P.E. of an object is it's

The speed of a particle is doubled, it's kinetic energy

• Remains same

• Becomes double

• Becomes four times

• Becomes half

What is the output energy of a nuclear power plant?

• Electrical energy

• Kinetic energy

• Chemical energy

• Heat energy

The potential energy of a freely falling object decreases progressively. Does this violate the law of conversation of energy. Why?

What is power? How do you differentiate kilowatt from kilowatt hour? Also Define 1 watt of power

What is the work done by the force of gravity on a satellite moving round the Earth? Justify your Answer.

Prove the formula K.E. = 1/2mv^2