Define the following terms and give their SI units. (a) Work (b) Power (c) Energy.

Define the following terms and give their SI units. (a) Work (b) Power (c) Energy.

Ans: – Works: – The term work is used when there is a displacement if an object by applying some amount of force to it. Its SI unit is N-S.

Power: – Power is denotes by the amount of work done in a certain time. The unit of power is watt.

Energy: – The energy is considered as the efficiency of doing some work.

 

List different forms of energy.

Ans: – The different forms of energy are thermal energy, heat energy, electrical energy, solar energy, wind energy.

 

State Law of Conservation of Energy. Explain with the help of examples.

Ans: – As we know the energy is conserve from one source to the other sources to the other source and in the whole way it is constant.

 

List the energy transformation taking place in a thermal power plant.

Ans: – In a thermal power plant the coal is heated up then the electricity is produced. In this process at first the heat energy is produced then this heat energy is transformed to electrical energy.

 

A ball of mass 0.5 kg has100 J of kinetic energy. What is the velocity of theball?

Ans: – As we know, kinetic energy (Ek)= 1/2mv^2;

Or, 100=1/2×0.5×v^2;

Or, v=20m/s.

 

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