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प्रश्न
Power spent by a body depends on the time for which it does work.
विकल्प
True
False
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उत्तर
True.
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संबंधित प्रश्न
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A sailboat is moving due to wind energy.
Explain briefly why the work done by a fielder when he takes a catch in a cricket match is negative.
State the S.I. unit of work and define it.
Fill in the blank with suitable word :
The work done on a body moving in a circular path is __________
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A machine raises a load of 750 N through a height of 16 m in 5s. calculate:
(i) work done by machine,
(ii) power at which the machine works.
(i) A 200g ball is thrown vertically upward with an initial velocity of 30 ms-1. Draw a velocity-time graph for the motion of ball.
(ii) How long will the ball take to reach the highest point?
(iii) What will be the kinetic energy of ball, when it returns to the starting point, neglecting the air resistance?
(iv) What will be the potential energy of ball at highest point?
A ______ should act on an object.
