Advertisements
Advertisements
प्रश्न
For the following scenarios, state whether the work done by gravity is positive, negative, or zero.
A person walks on a levelled road.
उत्तर
Zero work is done.
APPEARS IN
संबंधित प्रश्न
A satellite revolves around the earth in a circular orbit. What is the work done by the force of gravity? Give reason.
A coolie X Carrying a load on his head climbs up a slope and another coolie Y carrying the identical load on his head move the same distance on a frictionless horizontal platform. Who does more work? Explain the reason.
A boy weighing 350 N climbs up 30 steps, each 20 cm high in 1 minute, Calculate:
- the work done and
- power spent.
Name the quality which is measured in eV
What do you mean by equilibrium of a body?
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 negative.
What is the S.I. unit of work? Define it.
Justify the statement. “Power can be expressed as the product of force and velocity.”
State the C.G.S. unit of work. How it is related to its S.I. unit?
