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 ......................

An object is being heated by a heater supplying 60 W heat. Temperature

1.	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 ......................
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