Solve the numerical from Chapter Heat

1. How much heat must be added to raise the temperature of 200 g of water from 150C to 850C? ( 58800J)

2. An electrical kettle contains 200gm of water at 200C. How much heat is to be supplied in order to boil the water? (Assume that the water boils at 1000C and the kettle takes no heat) ( 67200J)
3. A brass rod of 0.4 kg mass at 1000C is dropped into 1.0 kg of water at 200C. The final temperature is 230C. Calculate the specific heat capacity of brass. ( 409.09 J/Kg0C)
4. The temperature of 20 kg water in the radiator of engine of a car is 300C. If the temperature of water increases upto 1000C after the engine is heated, what quantity of heat will the water absorb?(Ans: 5.88 x 106 J )
5. What will be the quantity of heat required to raise the temperature of 2kg paraffin by 100C if 44000 joules of heat energy is required to raise the temperature of the paraffin by 200C? (Ans: 4.4 x 104 J )

6.  Hot water of mass 7 kg at 980C is cooled for taking bath by mixing 14 kg of water at 100C. Calculate the final temperature of water. Specific heat capacity of water is 4200J/kg0C. Neglect the heat taken by the bucket.
(Ans: 39.330C )
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