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संबंधित प्रश्न
Explain briefly why the work done by a fielder when he takes a catch in a cricket match is negative.
A boy of mass 40 kg climbs up the stairs and reaches the roof at a height 8 m in 5 s. Calculate:
- the force of gravity acting on the boy,
- the work done by him against the force of gravity,
- the power spent by boy. (Take g = 10 m s-2)
What should be the angle between the direction of force and the direction of motion of a body so that the work done is zero?
The work done on an object does not depend on ______.
Name the force acting away from the centre of circular path.
Complete the following sentences:
1 H.P. = ........ W.
A block of mass 20 kg is pulled up a slope (fig.12) with a constant speed by applying a force of 500 N parallel to the slope. A and B are initial and final positions of the block.
(a) Calculate the work done by the force in moving the block from A and B.
(b) Calculate the potential energy gained by the block.
What are the advantages and disadvantages of using solar cells for producing electricity?
