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प्रश्न
A coolie does no work against the force of gravity while carrying a luggage on a road.
विकल्प
True
False
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उत्तर
True.
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संबंधित प्रश्न
Work is said to be done by a forte only when ................
Write the expression for work done by a force.
In which of the following cases, is work being done?
(i) A man pushing a wall.
(ii) a coolie standing with a load of 12 kgf on his head.
(iii) A boy climbing up a staircase.
What are the units of (a) work, and (b) energy?
A coolie, with a load of 30 kg on his head, walks on the platform. If he walks a distance of 60 m, what is the work done by him?
An electric motor of power 100 W is used to drive the stirrer in a water bath. If 50% of the energy supplied to the motor is spent in stirring the water. Calculate the work done on the water in one minute.
Force acting on a particle moving in a straight line varies with the velocity of the particle v as F = `K/v`, where K is a constant. The work done by this force in time t is
State whether work is done or not, by writing yes or no, in the following case:
A boy climbs up 20 stairs.
