A refrigerator has to transfer an average of 263 J of heat per second from temperature `(-10)^@C` to `25^@C`. Calculate the average power consumed assuming ideal reversible cycle and no other losses.

A refrigerator works between 4^(@)C and 30^(@)C . It is required to remove 600 cal of heat every second in order to keep the temperature of the refrigerator space constant.The power required is (Take 1cal= 4.2 J )

In a refrigerator one removes heat from a lower temperature and deposites to the surroundings at a higher temperature. In the process, mechanical work has to be done , which is provided by an electric motor. If the motor is of 1kW power , and heat is transferred from -3 ^@C to 27^@C , find the heat taken out of the refrigerator per second assuming its efficiency is 50% of a perfect engine.

A Carnot's engine used first an ideal monoatomic gas then an ideal diatomic gas. If the source and sink temperature are 411^@C and 69^@C respectively and the engine extracts 1000J of heat in each cycle, then area enclosed by the PV diagram is

A circular coil of radius 8.0 cm and 20 turns is rotated about its vertical diameter with an angular speed of 50 rad s^-1 in a uniform horizontal magnetic field of magnitude 3.0 xx 10^-2 T. Obtain the maximum and average emf induced in the coil. If the coil forms a closed loop of resistance 10 ohm, calculate the maximum value of current in the coil Calculate the average power lose due to the Joule heating .Where does this power come from ?

In a heat engine , the temperature of the source and sink are 500 K and 375 K . If the engine consumes 25 xx 10^5 J per cycle, find work done per cycle

The temperature inside a refrigerator is t_2 °C and the room temperature is t_1 °C. The amount of heat delivered to the room for each joule of electrical energy consumed ideally will be

A Carnot engine absorbs 1000 J of heat from a reservoir at 127^@C and rejects 600 J of heat during each cycle.Calculatethe temperature of the sink

The difference in temperature between two sides of a glass plate 0.3 mm thick is 25^@C . If the area of one side surface is 10 m^2 , calculate the heat conducted per second through the plate. The thermal conductivity of glass is 0.84 J//s m K.

A boiler heats water flowing at the rate of 2,0 litres per minute from 27°C to 77°C. If the boiler operates on a gas burner, the rate of consumption of the fuel if its heat of combustion is 4.0xx10^4J//g , is