Question

An engine draws water from a depth of 10 m with constant speed (at outlet) 2 m/sec at the rate of
10 kg per 10 s the power of the engine is (g = 9.8 m/s')?
(A) 102 W
(B) 50 W
(C) 100 W
(D) 98 W​

Answer 1

Answer:

Option (D) 98 W

The power of the engine is 98 W

Explanation:

Depth h = 10 m

Time taken in drawing water upto height of 10 m = 10/2 = 5 seconds

In 5 seconds the mass of water drawn m = 5kg

Total work done = mgh

                            = 5 × 9.8 × 10

                            = 490 Joule

Power is given by

P = Work Done/Time

  = 490/5

  = 98 W

Hope this helps.