What is power ? How do you differentiate killowatt from kilowatt hour ? The Jog Falls in Karnataka state are nearly 20 m high. 2000 tonnes of water falls from it in a minute. Calculate the equivalent power if all this energy can be utilized ? `(g = 10 m//s^2)`

The power of a motor pump is 5 kW. How much water per minute the pump an raise to height of 20 m ? Take g = 10ms ^-2 .

At a hydroelectric power plant, the water pressure head is at a height of 300 m and the water flow available is 100 m^3s^-1 . If the turbine generator efficiency is 60%, estimate the electric power available from the plant (g = 9.8 ms^-2) .

It is a common observation that rain clouds can be at about a kilometer altitude above the ground. If a rain drop falls from such a height freely under gravity, what will be its speed? Also calculate in km/h. (G = 10 m//s^2) .

A person in an elevator accelerating upwards with an acceleration of 2ms^-2 , tosses a coin vertically upwards with a speed of 20 m s^-1 . After how much time will the coin fall back into his hand? (g = 10 ms^-2)

A tank of capacity 10^3 kg is placed at the top of a house 10 m high.This tank is filled by a motor in 30 minutes by lifting water from a 20 m deep well.Find the power of motor(Take g=10m s^(-2) .

A hill is 500 m high. Supplies are to be sent across the hill using a canon that can hurl packets at a speed of 125 m//s over the hill. The canon is located at a distance of 800m from the foot of hill and can be moved on the ground at ba speed of 2 m//s, so that its distance from the hill can be adjusted. What is the shortest time in which a packet can reach on the ground across the hill? Take g= 10 m//s^(2) .