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प्रश्न
State the energy changes which take place when:
A battery lighting up a bulb.
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उत्तर
The electrical energy changes into heat energy and light energy.
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संबंधित प्रश्न
Fill in the blank
An object falling freely from the roof of a multistorey building has ________ and _________ energy when halfway down the building.
A boy of mass m climbs up a staircase of vertical height h.
(a) What is the work done by the boy against the force of gravity?
(b) What would have been the work done if he uses a lift in climbing the same vertical height?
Name the physical quantity measured in terms of horse power.
State different forms of potential energy and give one example of each.
What do you understand by the kinetic energy of a body?
Name the energy changes for the following:
pendulum
A metal ball of mass 2kg is allowed to fall freely from rest from a height of 5m above the ground.
What the kinetic energy of the ball just before it hits the ground ?
Is it possible that a body may possess energy even when it is not in motion?
What happens to the K.E. when
(i) the mass of the body is doubled at a constant velocity and
(ii) the velocity of the body is doubled at constant mass?
How much hydro-electric power is generated in India?
