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First law of thermodynamics

Question

One mole of an ideal diatomic gas undergoes a process AB as shown. Pressure at A and B are  5P0 and P0 while volumes are V0 and 5V0 respectively. On the basis of the given information answer the following question (s).

Moderate
Question

Choose the correct option regarding the process AB.

Solution

Temperature of gas at A and B is equal so  ΔU=0.
Equation of process

P=P0V0V+6P0     ... (1)
Heat reverse its direction when slope of line should be equal to γPV=P0V0 .. (2)
From equation (1) and (2)
V=72V0,  P=52P0

Question

During the process from  AB, pressure and volume of the gas, where the direction of flow of heat is reversed, is

Solution

Temperature of gas at A and B is equal so  ΔU=0.
Equation of process

P=P0V0V+6P0     ... (1)
Heat reverse its direction when slope of line should be equal to γPV=P0V0 .. (2)
From equation (1) and (2)
V=72V0,  P=52P0



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