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प्रश्न
State the energy changes in the following case while in use:
a ceiling fan
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उत्तर
electrical energy into mechanical energy
संबंधित प्रश्न
A certain form of energy which is not sourced directly or indirectly from the sun and does not cause any pollution is very easily converted into electricity. This form of energy is, however, not available everywhere. Moreover, it is technically very difficult and expensive to obtain it. Name the form of energy.
State two factors on which the kinetic energy of a moving body depends.
Name the type of energy (kinetic or potential) possessed by the following:
Water flowing in a river.
Select the renewable and non-renewable sources of energy from the following:
Oil
What is nuclear energy?
Write the type of energy possessed in the following case:
A bent bow
Write the type of energy possessed in the following case:
A falling apple
Show that in case of a body falling freely under gravity, total mechanical energy remains conserved (neglect air resistance).
A ball of mass 200 g falls from a height of 5 m. What will be its kinetic energy when it just reaches the ground? (g = 9.8 m s−2)
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)
