Advertisements
Advertisements
प्रश्न
Name the force needed for circular motion. What is the direction of the force?
Advertisements
उत्तर
The force needed for circular motion is 'centripetal force'.
This force is always directed towards the centre of circle at each point of its path.
APPEARS IN
संबंधित प्रश्न
How is work done by a force measured when the force is in the direction of displacement?
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.
State two factors on which power spent by a source depends. Explain your answer with examples.
State the factors on which moment of force about a point depends.
Work is a scalar quantity because it is a measure of transfer of energy without indicating any direction
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?
A pump is used to lift 600 kg of water from a depth of 75 m in 10s. Calculate:
- The work done by the pump,
- the power at which the pump works, and
- The power rating of the pump if its efficiency is 40%. (Take g = 10m s-2).
`["Hint" : "Efficiency" = "useful power"/"power input"]`
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.
