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प्रश्न
In the following case write yes, if the work is being done and no if no work is being done.
A coolie standing with a heavy load on his head
State whether work is done or not, by writing yes or no, in the following case:
A coolie stands with a box on his head for 15 min.
विकल्प
Yes
No
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उत्तर
No.
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संबंधित प्रश्न
Write an expression for the work done when a force is acting on an object in the direction of its displacement.
State the S.I. unit of energy.
Explain by an example that a body may possess energy even when it is not in motion.
What is the SI unit of work?
A boy of mass m climbs up a staircase of vertical height h.
- What is the work done by the boy against the force of gravity?
- What would have been the work done if he uses a lift in climbing the same vertical height?
A block of mass 30 kg is pulled up a slope, as shown in diagram with a constant speed, by applying a force of 200 N parallel to slope.
A and B are initial and final positions of block.
(i) Calculate the work done by force in moving the block from A to B.
(ii) Calculate P.E. gained by block. [g=10ms-2]
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.
