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Practice question

MCQ

Question

A copper cube has a side length of 10cm at 30∘C. What is its volume at 130∘C? (αl\=1.7×10−5K−1)

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Explanation

Given: L0 = 10cm, V0 = 103 = 1000cm3, ΔT = 130−30 = 100∘C, αl = 1.7×10−5K−1. Volume expansion: αv = 3αl = 3×1.7×10−5 = 5.1×10−5K−1. ΔV = V0αvΔT = 1000×5.1×10−5×100 = 5.1cm3. V = V0+ΔV = 1000+5.1 = 1005.1cm3.

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