(b) A rigid tank containing $0.4 \mathrm{~m}^{3}$ of air at 400 kPa and $30^{\circ} \mathrm{C}$ is connected by a valve to a piston cylinder device with zero clearance. The mass of the piston is such that a pressure of 200 kPa is required to raise the piston. The valve is opened slightly and air is allowed to flow into the cylinder until the pressure of the tank drops to 200 kPa . During this process, heat is exchanged with the surrounding such that the entire air remains at $30^{\circ} \mathrm{C}$ at all times. Determine the heat transfer for this process.
Explanation
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