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प्रश्न
What do you mean by degradation of energy?
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उत्तर
During the transformation of energy from one form to another desired form, some part of the energy is converted to some undesirable form or a part of it is lost to the surroundings due to the friction or radiations that cannot be used for any productive purpose. This is called dissipation of energy or degradation of energy.
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संबंधित प्रश्न
State the S.I. unit of work and define it.
1 J = ______ calorie.
Give one example in which a force does zero work.
How much work is done when a force of 2 N moves a body through a distance of 10 cm in the direction of force?
Complete the following sentences:
1 H.P. = ........ W.
A bullet is of mass 'm' g and is moving with a velocity 'v' m/s. Find the kinetic energy of the bullet when
(a) The mass is doubled,
(b) The velocity is tripled.
An electric motor pump is 60% efficient and is rated 2.5 H.P. Calculate the maximum load it can lift through a height of 10m in 8 sec. (1 H.P. = 750 W).
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A green plant is carrying out photosynthesis.
