The pressure of a gas changes linearly with volume from A to B as shown in figure. If no heat is supplied to or extracted from the gas then change in the internal energy of the gas will be: Image
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The pressure of a gas changes linearly with volume from A to B as shown in figure. If no heat is supplied to or extracted from the gas then change in the internal energy of the gas will be: Image

G1 Physics · Accepted Answer

Since Q = 0, ΔU = −W. From the P–V graph, average pressure during compression is 30 kPa and |ΔV| = 150 cm³ = 150×10⁻⁶ m³. Work done by gas W = −30×10³×150×10⁻⁶ = −4.5 J. Hence ΔU = +4.5 J.