Question

A boy takes 3 min to lift a 20 litre water bucket from a 20 m deep well , while his father

does it in 2 min

(a) How much work each does? Take density of water = 103 kg m -3 & g = 9.8 N/kg

(b) The power of a motor is 40 KW ,at what speed can the motor raise a load of 35000 N.

(c) An electric heater of power 4.2 KW is used for 10 hrs. How much energy does it
water level is at a

height of 45 m above the turbine . Assuming an overall efficiency of 30% , calculate the

mass of water which must flow through the turbine each second to produce power

output of 1MW.​

Answer 1

Answer:

option b

I hope this correct answer