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प्रश्न
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उत्तर
SI unit of power = watt
CGS unit of power = erg per second
1` W = 1 J s -1 = 107 erg s -1
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संबंधित प्रश्न
State the S.I. unit of work and define it.
Define 1 joule of energy.
A boy throws a rubber ball vertically upwards. What type of work, positive or negative, is done : by the force applied by the boy?
(a) by the force applied by the boy?
(b) by the gravitational force of earth?
Calculate the amount of work done by a child carrying a bag of 20 kg when he moves a distance of 40 m in
(a) Vertical direction, and
(b) Horizontal direction
State the energy changes which take place when Water stored in the dam is used to turn turbine in dynamo.
What is the difference between renewable and non-renewable resources?
How long should an electric motor, of power 2 H.P. operate, so as to pump 5 m3 of water from a depth of 15m. [Take g = 10 N kg−1]
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.
