Name the form of energy which a body may possess even when it is not in motion. Give an example to support your answer.

Name the form of energy which a wound up watch spring possesses.

Name the form of energy which a wound up watch spring possesses.

Can a body possess energy even when it is not in motion ? Explain your answer with an example.

What are forced vibrations ? Give one example to illustrate your answer.

Define mechanical energy. Can a body have energy even if it is not in motion?

Can displacement be zero even if distance is not zero ? Give one example to explain your answer.

Can two persons hear each other on moon's surface ? Give reason to support your answer.

Answer the following: (a) Derive an expression for the potential energy of an electric dipole in a uniform electric field. Explain conditions for stable and unstable equilibrium. (b) Is the electrostatic potential necessarily zero at a point where the electric field is zero ? Give an example to support your answer.