A refrigerator isto maintain eatables kept inside at `9^@C`. If room temperature is `36^@C`, calculate the coefficient of performance.

Assuming a domestic refrigerator a reversible engine working between melting point of ice and the room temperature of 17^@C .Calculate the enrgy in joule that m ust be suppled to freeze 2kg of water .Given that temperature of water = 0^@C nd L=80 cal//g .

A heating element using nichrome connected to a 230 V supply draws an initial current of 3.2 A which settles after a few seconds to a steady value of 2.8 A. What Is the steady temperature of the heating element If the room temperature is 27.0^@C ? Temperature coefficient of resistance of nichrome averaged over the temperature range involved is 1.70 xx 10^-4@C .

If the co-efficient of perormance of a refrigerator is 5 and operates at the room temperature (27^@C) , find the temperature inside the refrigerator.

Estimate the average thermal energy of a helium atom at room temperature (27 ^@C)

Calcualte the temperature at which the resistance of a conductor becomes 20% more than its resistance at 27^@C . The value of the temperature coefficient of resistance of the conductor is 2.0 xx 10^-4 K^-1

The resistance of a bulb filmanet is 100Omega at a temperature of 100^@C. If its temperature coefficient of resistance be 0.005 per .^@C, its resistance will become 200 Omega at a temperature of

A wire has a resistance of 10.5Omega at 21^@C and 16.4Omega at 147^@C . Find the value of temperature coefficient of resistance.