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प्रश्न
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संबंधित प्रश्न
A stone of mass m is rotated in a circular path with a uniform speed by tying a strong string with the help of your hand. Answer the following questions
1) Is the stone moving with a uniform or variable speed?
2) Is the stone moving with a uniform acceleration? In which direction does the acceleration act?
3) What kind of force acts on the hand and state its direction?
Name the quality which is measured in kWh.
What is meant by a rotatory motion? Give one example.
Work is a scalar quantity because it is a measure of transfer of energy without indicating any direction
State two conditions for work to be done.
State the S.I. and C.G.S. units of energy. How are they related?
Derive a relation between the S.I. and C.G.S. unit of force.
A coolie carrying a load on his head and moving on a frictionless horizontal platform does no work. Explain the reason why.
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.
A boy weighing 50 kgf climbs up from the first floor at a height of 3 m above the ground to the third floor at a height of 9 m above the ground. What will be the increase in his gravitational potential energy? (Take g = 10 N kg-1).
