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प्रश्न
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उत्तर
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संबंधित प्रश्न
State the condition when the work done by a force is positive. Explain with the help of examples.
What is meant by a rotatory motion? Give one example.
What do you mean by a centrifugal force?
In which one of the following cases is the work done more? When the angle between the direction of motion and that of the force is (i) 90° (ii) 0°.
It takes 20 s for a person A of mass 50 kg to climb up the stairs, while another person B of same mass does the same in 15 s. Compare the power developed by the persons A and B.
State the S.I. and C.G.S. units of energy. How are they related?
The world record for weight lifting was held by Sergei Didyk of the USSR. He lifted 261 kg to a height of 2.3 m in 4s; find:
(a) Weight lifted by him
(b) Work done by him
(c) Power developed by him. (g = 10m/s2)
A machine raises a load of 750 N through a height of 16 m in 5 seconds. Calculate the power at which the machine works.
