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Physic- 30
Questions on Thermal Physics:1) A piece of metal of mass 0·2kg is heated to a temperature of 200°C. It is then put into 0·2kg of water at 20°C in a container of negligible heat capacity. The "final" temperature, after stirring, is 40°C. Calculate the specific heat capacity of the metal. 2) A piece of metal of mass 100g, has a temperature of 100°C. It is put into 100g of water at 20°C in a container of negligible heat capacity. After stirring, the maximum temperature of the "mixture" (metal and water) is 27·5°C. Calculate the specific heat capacity of the metal. 3) How long will it take to change the temperature of 200kg of water from 15°C to 40°C, using a heater of power 3kW. Assume that all the thermal energy remains in the water. Specific heat capacities:
Specific latent heat of fusion of ice = 3·3×105Jkg-1 Molar heat capacities of a diatomic ideal gas: Cv = 12·5J(molK)-1 and Cp = 20·8J(molK)-1 |