Advertisements
Advertisements
Question
State the factors on which moment of force about a point depends.
Advertisements
Solution
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
RELATED QUESTIONS
What are the S.I. and C.G.S units of work? How are they related? Establish the relationship.
What physical quantity does the electron volt (eV) measure? How is it related to the S.I. unit of that quality?
Is it possible that no transfer of energy may take place even when a force is applied to a body?
State the condition when a force produces
(i) linear motion.
(ii) rotational motion, in a body.
Work is a scalar quantity because it is a measure of transfer of energy without indicating any direction
In which one of the following cases is the work done more? When the angle between the direction of motion and that of the force is (i) 90° (ii) 0°.
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"]`
State the practical unit mainly used in mechanical engineering and write down its equivalent in watt.
Relate 1 KWh (kilowatt hour) with joule.
A boy weighing 50 kgf climbs up from the first floor at a height of 3 m above the ground to the third floor at a height of 9 m above the ground. What will be the increase in his gravitational potential energy? (Take g = 10 N kg-1).
