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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 man trying to push a wall.
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उत्तर
No.
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.
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.)
What are the S.I. and C.G.S units of work? How are they related? Establish the relationship.
One horse power is equal to ______.
A boy weighing 350 N climbs up 30 steps, each 20 cm high in 1 minute, Calculate:
- the work done and
- power spent.
Is it possible that no transfer of energy may take place even when a force is applied to a body?
State the principle of moments.
Name the force needed for circular motion. What is the direction of the force?
An engine does 54,000 J of work by exerting a force of 6000 N on it. What is the displacement in the direction of the force?
State the condition when the work done by the force is positive
