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प्रश्न
Can every force produce work?
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उत्तर
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संबंधित प्रश्न
Work is said to be done by a forte only when ................
A coolie is moving on a road with a luggage on his head. Does he perform work against the force of gravity? Give reason for your answer.
A body, when acted upon by a force of 10 kgf, moves to a distance 0.5 m in the direction of force. Find the work done by the force. Take 1 kgf = 10 N.
A person of mass 50 kg climbs a tower of height 72 metres. Calculate the work done. (g = 9.8 m s−2).
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.
State the energy changes which take place when A piece of magnesium wire is burnt in a jar of oxygen.
State the energy changes which take place when A stone dropped from the top of a cliff reaches the ground after some time.
A canon ball of mass 500g is fired with a speed of 15m/s-1. Find: its momentum.
