Advertisements
Advertisements
Question
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.
Advertisements
Solution
Power = `("Force"xx"Distance")/"Time"`
=`(750xx16)/5"watt"`
= 2400 watt.
= 2.4 KW.
RELATED QUESTIONS
How is work done by a force measured when the force is in the direction of displacement?
A body is moved in a direction opposite to the direction of force acting on it. State whether the work is done by the force or work is done against the force
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.
What are the S.I. and C.G.S units of work? How are they related? Establish the relationship.
State and define the S.I. unit of work.
A body, when acted upon by a force of 10 kgf, gets displaced by 0.5 m. Calculate the work done by the force, when the displacement is (i) in the direction of force, (ii) at an angle of 60° with the force, and (iii) normal to the force. (g = 10 N kg-1)
A boy weighing 350 N climbs up 30 steps, each 20 cm high in 1 minute, Calculate:
- the work done and
- power spent.
A man spends 7.4 kJ energy in displacing a body by 74 m in the direction in which he applies force, in 2.5 s. Calculate the power spent (in H.P) by the man.
How is 1 kgf related to the SI unit of force?
A man raises a box of mass 50 kg to a height of 2 m in 20 s, while another man raises the same box to the same height in 50 s. Compare:
- the work done, and
- the power developed by them. Take g = 10 N kg-1
