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प्रश्न
Name five different forms of energy.
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उत्तर
The different forms of energy are :
(i) Mechanical energy
(ii) Heat energy
(iii) Light energy
(iv) Chemical energy
(v) Sound energy
(vi) Magnetic energy
(vii) Electrical energy and
(viii) Atomic energy or nuclear energy.
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संबंधित प्रश्न
Calculate the change in the Kinetic energy of a moving body if its velocity is reduced to 1/3rd of the initial velocity.
Select the renewable and non-renewable sources of energy from the following:
Wind
State two disadvantages of producing electricity from solar energy.
Identify the type of energy possessed by the body in the following:
A coiled spring of the toy car.
How is kinetic energy possessed by a moving body measured?
Give three examples of bodies possessing potential energy.
State the energy changes which take place when:
Photographic film is exposed to sunlight.
A girl of mass 35 kg climbs up from the first floor of a building at a height 4 m above the ground to the third floor at a height 12 m above the ground. What will be the increase in her gravitational potential energy? [g = 10 ms-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)
Unit of calorific value of a substance is ____________.
