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प्रश्न
Name the two groups in which various sources of energy are classified?
उत्तर
Renewable and Non-renewable sources of energy.
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संबंधित प्रश्न
Write true or false of the following statement.
The energy of flowing water can be converted into electric energy (electricity).
Name five different forms of energy.
A body of mass m is moving with a velocity v. Write the expression for its kinetic energy.
What is meant by the renewable and non-renewable sources of energy? Distinguish between them giving two examples of weach.
Explain the principle of working of the windmill for generating electricity.
State two advantages and disadvantages of using wind energy for producing electricity.
State the energy changes which take place when:
A body thrown vertically upwards from the ground.
State the energy changes which take place when:
In a heat engine.
State the energy changes which take place when:
Food is digested by animals.
A ball of mass 50 g falls from a height of 2m and rebounds from the ground to 1.6 m. Find:
(i) The potential energy possessed by the ball when initially at rest.
(ii) The kinetic energy of the ball before it hits the ground.
(iii) The final potential energy of the ball.
(iv) The loss in kinetic energy of the ball on collision. (Take: g = 10N kg−1)
