[" 12.A brick weighing "4*0kg" is dropped into a "1*0m" deep "],[" river from a height of "2*0m" .Assuming that "80%" of the "],[" gravitational potential energy is finally converted into "],[" thermal energy,find this thermal energy in calorie."]

In generation of hydroelectric power, water falls from some height and gravitational potential energy of water is converted into electric power with the help of turbine. In one such event, 7.2xx10^4kg of water falls per hour from height 100m and half of the gravitational potential energy is converted into electric energy. How much power is generated?

A body of mass 4kg, is taken from a height of 5 m to a hegiht 10m. Find increase in potential energy.

Calculate the rise in temperature of water, which falls from a height of 100m. Assume that 80% of the energy due to fall is converted into heat and is retaied by the water. J = 4.2 xx 10^(7) erg cal^(-1) .

A body of mass 10 kg is dropped from a height of 20 m. (Take g = 10 m/s^2) Fuid its potential energy before it is dropped

Water drops from a height of 40 m in a waterfall. if 75% of its energy is converted into heat and absorbed by the water, the rise in temperature of the water will be

In a dam,water falls at a rate of 1000 kg s^(-1) from a height of 100 m . (b)Assuming that 60% of the energy of the falling water is converted to electrical energy,Calculate the power generated (Take g=9.8 m s^(-2) )

A man of 60kg jumps to a height of 1.0m. What is the potential energy of the man at the highest point?

A dam is used to block the passage of a river and to generate electricity. Approximately 5.73xx10^(4) kg of water fall each second through a height of 19.6 m. If one half of the gravitational potential energy of the water were converted to electrical energy, how much power would be generated ?

A ball is dropped onto a floor from a height of 10 m . If 20% of its initial energy is lost,then the height of bounce is