Question

18.1 A body does 20 J of work in 5 seconds. Calculate its power in watts.
18.2 An electric bulb consumes 7.2 kJ of electrical energy in 2 minutes. Calculate the power of the bulb.
18.3 What is the power of a pump which takes 10 seconds to lift 100 kg of water to a water tank situated
at a height of 20 m? (Consider g = 10 m/s2)
18.4 Four bulbs, with the power of 10 W each, are lit for 30 minutes. Calculate the electrical energy
consumed by them.​

Answer 1

Answer:

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