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प्रश्न
State the energy changes which take place when:
A bulb glows, when torchlight is switched on.
उत्तर
The chemical energy of cell changes to electric energy. The electric energy first changes to heat and finally to light energy.
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संबंधित प्रश्न
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The energy possessed by a body due to its position is called ________ energy.
Fill in the blank
An object falling freely from the roof of a multistorey building has ________ and _________ energy when halfway down the building.
Name five different forms of energy.
Give one relevant example for the following transformation of energy:
Electrical energy to heat energy.
What is tidal? Explain in brief.
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)
State the energy changes which take place when:
A body released from rest from the top of a building.
What is the form of that graph between
(i) K.E. and velocity for a constant mass?
(ii) K.E. and mass for a constant velocity?
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)
What is meant by energy?
