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प्रश्न
What is the S.I. unit of work? Define it.
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उत्तर
The S.I. unit of work is newton-metre or joule (J).
1 Joule = 1 N × 1 m.
1 J of work is said to be done by a force of 1 N if it displaces a body by 1 m in the direction of the force.
संबंधित प्रश्न
When does a force do work?
A man having a box on his head, climbs up a slope and another man having an identical box walks the same distance on a levelled road.
Who does more work against the force of gravity and why?
State the condition when the work done by a force is positive. Explain with the help of examples.
When a body moves in a circular path, how much work is done by the body? Give reason.
(Hint: The body is acted upon by the centripetal force.)
An ox can apply a maximum force of 1000 N. It is taking part in a cart race and is able to pull the cart at a constant speed of 30 ms-1 while making its best effort. Calculate the power developed by the ox.
It takes 20 s for a person A of mass 50 kg to climb up the stairs, while another person B of same mass does the same in 15 s. Compare the power developed by the persons A and B.
What is the work done by the gravitational force on the moon that revolves around the earth?
State the S.I. and C.G.S. units of energy. How are they related?
Calculate the work done when:
A car is moved on a rough road through 30 m against a frictional resistance of 75 N.
A machine raises a load of 750 N through a height of 16 m in 5 seconds. Calculate the power at which the machine works.
