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प्रश्न
What kind of energy is possessed in a situation when?
A stone lying on the top of roof.
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उत्तर
Potential Energy.
संबंधित प्रश्न
What is nuclear energy?
State whether a solar cell produces a.c. or d.c.
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 ball of mass 0.5 kg slows down from a speed of 5m/s-1 to that of 3m/s-1. Calculate the change in kinetic energy of the ball.
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?
Give two examples each of renewable and non-renewable sources of energy?
State the energy changes which take place when:
A bulb glows, when torchlight is switched on.
State the energy changes which take place when:
Water stored in dams rotates turbine connected to a dynamo.
Calculate the change in the Kinetic energy of a moving body if its velocity is reduced to 1/3rd of the initial velocity.
