An object is being heated by a heater supplying `60W` of heat. Temperature of surrounding is `20^(@)C` and the temperature of object becomes constant at `50^(@)C` Now the heater is switched off What is the rate at which the object will lose heat when its temperature has dropped to `30^(@)C` .

An object is being heated by a heater supplying 60 W heat. Temperature of surrounding is 20^(0)C and the temperature of object becomes constant at 50^(0)C . Now the heater is switched off. The rate at which the object will lose heat when its temperature has dropped to 30^(0)C is 4xxz watt. Then z is equal to ......................

Change in heat energy of the object when its temperature is changed:

Change in heat energy of the object when its temperature is changed:

Heat absorbed by an object when its temperature changes is :_________.

Water is filled in a vessel which is kept in a room at a temperature of 20^(@)C . The temperature of the water is slowly increased. When the temperature of water is 40^(@)C , it loses heat at the rate of 10cal/s. What will be the rate of loss of heat when the temperature of water is 80^(@)C ?

A metal block is placed in a room which is at 10^(@)C for long time. Now it is heated by an electric heater of power 500 W till its temperature becomes 50^(@)C . Its initial rate of rise of temperature is 2.5^(@)C//sec . The heater is switched off and now a heater of 100W is required to maintain the temperature of the block at 50^(@)C . (Assume Newtons Law of cooling to be valid) What is the rate of cooling of block at 50^(@)C if the 100W heater is also switched off?

A metal block is placed in a room which is at 10^(@)C for long time. Now it is heated by an electric heater of power 500 W till its temperature becomes 50^(@)C . Its initial rate of rise of temperature is 2.5^(@)C//sec . The heater is switched off and now a heater of 100W is required to maintain the temperature of the block at 50^(@)C . (Assume Newtons Law of cooling to be valid) What is the rate of cooling of block at 50^(@)C if the 100W heater is also switched off?

A metal block is placed in a room which is at 10^(@)C for long time. Now it is heated by an electric heater of power 500 W till its temperature becomes 50^(@)C . Its initial rate of rise of temperature is 2.5^(@)C//sec . The heater is switched off and now a heater of 100W is required to maintain the temperature of the block at 50^(@)C . (Assume Newtons Law of cooling to be valid) What is the heat capacity of the block?