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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.
APPEARS IN
संबंधित प्रश्न
Work done = Force × ........................................
When does a force perform work?
State two factors on which the work done on a body depends.
Define the term 'work'. Write the formula for the work done on a body when a force acts on the body in the direction of its displacement. Give the meaning of each symbol which occurs in the formula.
How much work is done when a force of 2 N moves a body through a distance of 10 cm in the direction of force?
What happens to the work done when the dispacement of body is at right angles to the direction of force acting on it? Explain your answer.
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]
How long should an electric motor, of power 2 H.P. operate, so as to pump 5 m3 of water from a depth of 15m. [Take g = 10 N kg−1]
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
Food grains are getting dried in the sun.
