The room heater can provide only `16^(@)C` in the room when the temperature outside is `-20^(@)C`. It is not warm and comfortable, that is why th electric stove with power of `1 kW` is also plugged in. Together these two devices maintain the room temperature of `22^(@)C`. Determine the thermal power of the heater.

Does a body at 20^(@)C radiate in a room, where the room temperature is 30^(@)C ? If yes, why does its temperature not fall further?

Does a body at 20^(@)C radiate in a room, where the room temperature is 35^(@)C ? If yes, why does its temperature fall further?

A solid sphere cools at the rate of 2.8^(@)C per minute, when its temperature is 127^(@)C . Find the rate at which another solid copper sphere of twice the radius looses its temperature at 127^(@)C , in both the cases, the room temperature is maintained at 27^(@)C is

An electric immersion heater of 1.08 kW is immersed in water . After it has reaches a temperature of 100^(@)C , how much time will be required to produce 100 g of steam?

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 500W 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 The heat radiated per second when the block was 30^(@)C is given as alpha watt. Find the value of ((alpha)/(10)) (Assume Newton's law of cooling to be valid .

The temperature of a room heated by heater is 20^@C when outside temperature is -20^@C and it is 10^@C when the outside temperature is -40^@C . The temperature of the heater is

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?

A metal block is placed in a room which is at 10^(@)C . 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 100 W is required to maintain the temperature of the block at 50^(@)C . (Assume Newtons Law of cooling to be valid) (i) What is the heat capacity of the block ? ( ii ) What is the rate of cooling of block at 50^(@)C if the 100W heater is also switched off ? (iii) What is the heat radiated per second when the block was 30^(@)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?