Thermodynamics ...

A heat engine is supplied with 250 kJ/s of heat at a constant fixed temperature of $$227^0C$$; the heat is rejected at $$27^0C$$, the cycle is reversible, then what amount of heat is rejected?

An ideal gas expands according to the law $$pV^2$$= const. The molar heat capacity C is

A number of small drops of mercury coalesce adiabatically to form a single drop. The temperature of drop

A gas is compared adiabatically till its temperature is doubled. The ratio of his final volume to its initial volume will be :

When an ideal gas at pressure p, temperature T and volume V is isothermally compressed to V/n, its pressure becomes $$\displaystyle p_i$$. If the gas is compressed adiabatically to $$\displaystyle \frac{V}{n}$$, its pressure becomes $$\displaystyle p_a$$. The ratio $$\displaystyle p_i/p_a$$ is $$\displaystyle \left( \gamma = \frac{C_p}{C_V} \right)$$

In an adiabatic process.

During one cycle of a heat engine $$2000$$ calories of heat is supplied and $$1500$$ calories rejected. The amount of work done equals:

A gas is compressed at constant pressure $$ 50 N/m^2$$ from a volume of $$ 0m^3$$ to a volume $$ 4m^3 . $$ Energy $$100 J$$ is then added to the gas by heating. Its internal energy is :

In the P - V diagram below the dashed curved line is an adiabatic process. For a process that is described by a straight line joining two points $$X$$ and $$Y$$ on the adiabat (solid line in the diagram) heat is : (hint : Consider the variations in temperature from $$X$$ to $$Y$$ along the straight line)

A heat engine is $$20$$% efficient. If the engine does $$500\ J$$ of work every second, how much heat does the engine exhaust every second?