Engineering Thermodynamics
The heat supplied to the gas at constant volume is (where m = Mass of gas, cv = Specific heat at constant volume, cp = Specific heat at constant pressure, T2 - T1 = Rise in temperature, and R = Gas constant)

mcv (T2 - T1)
mcp (T2 - T1)
mR (T2 - T1)
mcp (T2 + T1)

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Engineering Thermodynamics
Which of the following is the correct statement of the second law of thermodynamics?

It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
All of these
There is a definite amount of mechanical energy, which can be obtained from a given quantity of heat energy
It is impossible to transfer heat from a body at a lower temperature to a higher temperature, without the aid of an external source

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