The input power to a machine is 1500 W and its efficiency is 80%. Then, the output power by the machine is :
Input Power = 1500 W
n= Output PowerInput Power
⇒ Output power = n× input power = 0.8 × 1500 W = 1200 W
A machine lifts a load of 200 kg in a vertically upward direction. If the machine is driven by a freely falling mass of 40 kg through a distance of 8 m in 4 s, calculate power intput of machine.[Take g =10ms–2]
A machine raises a load of 750 N through a height of 16 m in 5 s.Calculate:
(i) the energy spent by the machine,
(ii) the power of the machine if it is 100% efficient.