Question

Water falling from a 50 m high fall is to be used for generating electric power. If $1.8 \times 10^{5$ kg of water falls per hour and half the gravitational potential energy can be converted into electric energy, how many 100 watt lamps can be lit?

Answer 1

Answer:

Explanation:

First calculate gravitational potential energy by using formula E = mgh, where m mass , g is accleration due to gravity which is 9.8 m/s2 , h is height ,

Then this energy value put in formula of power which is p= work/time which unit is watt,

Now you can easily calculate how much light bulb is lit.