A brick weighing `4.0 kg `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 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 on a floor from a height of 2.0m After the collision it rises up to a height of 1.5m . Assume that 40% of the mechanical energy lost goes as thermal energy into the ball. Calculate the rise in the temperature of the ball in the collision heat capacity of the ball is 800J K^(-1)

A ball is dropped on a floor from a height of 2.0m After the collision it rises up to a height of 1.5m . Assume that 40% of the mechanical energy lost goes as thermal energy into the ball. Calculate the rise in the temperature of the ball in the collision specific heat capacity of the ball is 800J kg^(-1) K^(-1)

A ball is dropped on a floor from a height of 2.0m After the collision it rises up to a height of 1.5m . Assume that 40% of the mechanical energy lost goes as thermal energy into the ball. Calculate the rise in the temperature of the ball in the collision specific heat capacity of the ball is 800J kg^(-1) K^(-1)

What is the change in potential energy (in calories) of a 10 kg mass after 10m fall?

What is the change in potential energy (in calories) of a 10 kg mass after 10m fall?

A ball is dropped on a floor from a height of 2.0m . After the collision it rises up to a height of 1.5m . Assume that 40% of the mechanical energy lost goes as thermal energy into the ball.Calculate the rise in the temperature of the ball in the collision. Heat capacity of the ball is 800J K^(-1)

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) .