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प्रश्न
Calculate the work done when:
A car is moved on a rough road through 30 m against a frictional resistance of 75 N.
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उत्तर
Resisting force = 75 N; Distance moved = 30 m
∴ Work done = 75 × 30 J = 2250 J.
संबंधित प्रश्न
A boy weighing 40 kgf climbs up a stair of 30 steps each 20 cm high in 4 minutes and a girl weighing 30 kgf does the same in 3 minutes. Compare:
- The work done by them.
- The power developed by them.
State and define the S.I. unit of work.
Name the quality which is measured in Wh.
Work is a scalar quantity because it is a measure of transfer of energy without indicating any direction
How much force is applied on a body when 150 J of work is done in displacing the body through a distance of 10 m in the direction of the force?
State the practical unit mainly used in mechanical engineering and write down its equivalent in watt.
A boy weighing 50 kgf climbs up from the first floor at a height of 3 m above the ground to the third floor at a height of 9 m above the ground. What will be the increase in his gravitational potential energy? (Take g = 10 N kg-1).
