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प्रश्न
State two conditions for work to be done.
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उत्तर
The two conditions are:
(i) Application of-force on the body.
(ii) Displacement of the body in the direction of the force.
संबंधित प्रश्न
What are the S.I. and C.G.S units of work? How are they related? Establish the relationship.
A man spends 7.4 KJ energy in displacing a body by 74 m in the direction in which he applies force in 2.5 s. Calculate the force applied.
What is meant by a rotatory motion? Give one example.
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?
A man raises a box of mass 50 kg to a height of 2 m in 20s, while another man raises the same box to the same height in 50s. Calculated:
- the work done, and
- the power developed by each man. Take g = 10 N kg-1.
A boy takes 3 minutes to lift a 20 litre water bucket from a 20 m deep well, while his father does it in 2 minutes. Compare:
- the work, and
- power developed by them.
Give the units of couple.
What happens to the power if the time for doing work is reduced from t second to t/10 second?
State the C.G.S. unit of work. How it is related to its S.I. unit?
