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QPages 62-64: Q4: HC Verma: Concepts of Physics - Volume 2 Laws of Thermodynamics Pages 62-64: Q4 Solution: Calculate the change in internal energy of a gas kept in a…
⚠️ Common Exam Traps & Conceptual Pitfalls
Students often apply the wrong sign convention, writing ΔU = Q + W or assuming PdV work occurs even when ΔV=0; remember that for a rigid container W=0 (no boundary work) and the first law uses ΔU = Q – W (work done by the system), so ΔU equals the heat added.
Calculate the change in internal energy of a gas kept in a rigid container when 100 J of heat is supplied to it.
Step-by-Step Verified Solution
**Answer:** J.
**Step-by-Step Explanation:**
For a rigid container, , so . By first law: J [citation:2].
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