When a piece of metal fall down from 90 m, its temperature is increased by` 1.4^@C`. If 50% of the produced heat help to rise temperature, then calculate the. value of specific heat of the body ,`g =980 cm//s^2`.

A block having mass of 2 kg is pulled over a horizontal surface at a constant velocity of 20 km cdot h^(-1) . If the frictional coefficient is 0.5, calculate the amount of heat produced in 1 h. If 50% of the heat produced i absorbed by block, what will be the increase in its temperature? Specific heat of the body = 0.1 cal cdot g^(-1) cdot^(@)C^(-1) .

A calorimeter of water equivalent 10 g contains 100 g of water at 90^(@)C . On exposure to air, its temperature falls to 80^(@)C in 5 min. If the same calorimeter is filled with 50 g of an oil, the time for the same drop in temperature is 2 min. Calculate the specific heat of the oil if the rate of heat loss in both the cases is assumed to be the same.

The amount of heat required by 1 g of a substance for its 1^(@)C rise in temperature is called its

If a lead bullet hits a wall, its temperature rises by 200^(@)C . What is the speed of the bullet if the heat so produced remains completely in the bullet? Specific heat of lead = 0.03 cal cdot g^(-1) cdot^(@)C^(-1) .

How much heat is required to rise temperature from -8^@C to 50^@C of 10gm ice. Specific heat of ice 0.5 calorie gm ^-1^@C^ - 1 .

The temperature erange and pressure, at which the heat required by 1 g water for 1^(@)C rise in its temperature is called 1 cal, is

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