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प्रश्न
When a body moves in a circular path, how much work is done by the body? Give reason.
(Hint: The body is acted upon by the centripetal force.)
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उत्तर
When a body moves in a circular path, no work is done since the force on the body is directed towards the centre of circular path (the body is acted upon by the centripetal force), while the displacement at all instants is along the tangent to the circular path, i.e., normal to the direction of force.
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संबंधित प्रश्न
Differentiate between work and power.
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Name the quality which is measured in kW.
State the principle of moments.
What is a centripetal 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°.
Justify the statement. “Power can be expressed as the product of force and velocity.”
State the practical unit mainly used in mechanical engineering and write down its equivalent in watt.
What happens to the power if the time for doing work is reduced from t second to t/10 second?
