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प्रश्न
state the unit of energy.
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उत्तर
The SI unit of work is ‘joules’ and the CGS unit is ‘erg’.
संबंधित प्रश्न
Define 1 joule of energy.
Name the forms of energy which a wound-up watch spring possesses.
Find the kinetic energy of a body of mass 1 kg moving with a uniform velocity of 10 m s-1.
A car is running at a speed of 15 km h-1 while another similar car is moving at a speed of 45 km h-1. Find the ratio of their kinetic energies.
When is the work done by a force on a body : (a) positive, (b) negative, and (c) zero?
A boy tries to push a truck parked on the roadside. The truck does not move at all. Another boy pushes a bicycle. The bicycle moves through a certain distance. In which case was the work done more : on the trick or on the bicycle? Give a reason to support your answer.
Name the type of energy possessed by a
(i) stretched catapult (ii) hot iron
(iii) wound up clock
List any six forms of energy and write a short note on each of them.
