Advertisements
Advertisements
प्रश्न
State the factors on which moment of force about a point depends.
Advertisements
उत्तर
The factors on which the moment of force about a point depends are:
1. The magnitude of force applied.
2. The distance of the line of action of the force from the axis of rotation.
APPEARS IN
संबंधित प्रश्न
When a body is placed on a table top, it exerts a force equal to its weight downwards on the table top but does not move or fall
1) Name the force exerted by the table top
2) What is the direction of the force?
When does a force do work?
Give an example when work done by the force of gravity acting on a body is zero even though the body gets displaced from its initial position.
Name the quality which is measured in kW.
What do you understand by the clockwise and anti clockwise moment of force?
Work is a scalar quantity because it is a measure of transfer of energy without indicating any direction
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.
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.
State the C.G.S. unit of work. How it is related to its S.I. unit?
