Question

An engine pumps 100 kg of water through a height of 10 m in 5 sec.given that the efficiency of the engine is 60%.the power of the engine is:

Answer 1

answer An engine pumps up 100 kg of water through a height of 10 m in 5 s. Given that the efficiency of the engine is 60% . If g=10m{{s ...

Answer 2

SoluTion-

Work done by engine [Against gravity] :-

W = mgh

→ W = 100 × 10 × 10

→ W = 10000 J

Power used by engine = W/∆t

→ Power used by engine = 10000/5

→ Power used by engine = 2000 W

Power of engine be P,

→ P × 60/100 = 2000

→ P = (2000 × 100) / 60

→ P = 20000/6

→ P = 3333.34 W

→ P = 3.333 kW

Hence, power of engine will be 3.333 kW.