Physics
A weight lifter lifted a load of 200 kgf to a height of 2.5 m in 5 s.
Calculate:
(i) the work done, and
(ii) the power developed by him.
Take g = 10Nkg-1
Related Questions
A boy of mass 40kg climbs up the stairs and reaches the roof at a height 8m in 5s. Calculate:
(i) The force of gravity acting on the boy,
(ii)The work done by him against gravity,
(iii)The power spent by the boy.
Take g = 10 ms-2
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:
(i) the force applied and
(ii) the power spent (in H.P) by the man.
A machine raises a load of 750N through a height of 16m in 5s. Calculate:
(i) the energy spent by the machine.
(ii) the power of the machine if it is 100% efficient.
An electric heater of power 3 kW is used for 10 h. How much energy does it consume? Express your answer in
(i) kWh
(ii) joule.