A heated iron block at 127 ∘C loses "300J of heat to the surrounding which is at a temperature of 27∘C.Delta S for this process is 0.05xJK^(-1) Find the value of x.

A heated irron block at 127^(@)C loses 300J of heat to the surroundings which are at a temperature of 27^(@)C . This process is 0.05 J K^(-1) . Find the value of x .

A heated copper block at 130^(@)C loses 340 J of heat to the surroundings, which are at room temperature of 32^(@)C . Calculate total entropy change in the universe due to this process.

Corresponding to the process shown in figure, the heat given to the gas in the process ABCA is (0.2x)J . Find value of x.

A certain process releases 64.0 kJ of heat, which is transferred to the surroundings at a constant pressure and a constant temperature of 300 K. For this process DeltaS_("surr") is:

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 .

The heat capacity of a refrigerating chamber is 80000cal . Calculate the time in which the temperature of the chamber is reduced from 0.5^(@)C ot 0^(@)C if the power of the motor working the machine is 300W . Ambient temperature =27^(@)C .

A steel drill making 180 rpm is used to drill a hole in a block of steel. The mass of the steel block and the drill is 180 gm. If the entire mechanical work is used up in producing heat and the rate of raise in temperature of the block and the drill is 0.5 °C/s. Find (a) the rate of working of the drill in watts, and (b) the torque required to drive the drill. Specific heat of steel = 0.1 and J = 4.2 J//cal . Use : P = tau omega

The efficiency of a heat engine if the temperature of source 127∘ C and that of sink is 27∘ C nearly