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प्रश्न
Give two examples each of renewable and non-renewable sources of energy?
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उत्तर
Renewable sources of energy: Solar energy and wind energy.
Non-renewable sources of energy: coal and oil.
संबंधित प्रश्न
Name the process used for producing electricity using nuclear energy.
Give one relevant example for the following transformation of energy :
Chemical energy to light energy.
Name three non-renewable sources of energy.
State two advantages of using wind energy for generating electricity.
Renewable source of energy is:
A hydroelectric power station takes its water from a lake whose water level is 50 m above the turbine. Assuming an overall efficiency of 40%, calculate the mass of water which must flow through the turbine each second to produce power output of 1 MW. (Take g = 10 m s−2).
A body of mass 0.2 kg falls from a height of 10 m to a height of 6 m above the ground. Find the loss in potential energy taking place in the body. [g = 10ms−2]
For the same kinetic energy of a body, what should be the change in its velocity if its mass is increased nine times?
