A metal rod of length 50cm is heated from 40oC to 80oC. If the linear...

WAEC 2008

A metal rod of length 50cm is heated from 40^oC to 80^oC. If the linear expansivity of the material is \(\alpha\), calculate the increase in length of the rod (in metres) in terms of \(\alpha\)

A. 20\(\alpha\)
B. 200\(\alpha\)
C. 2000\(\alpha\)
D. 20000\(\alpha\)

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Correct Answer: Option A

Explanation

\(L_2 - L_1 = \alpha_1 (\theta_2 - \theta_1) = \alpha \times 0.5 \times 40 = 20 \alpha\)

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A metal rod of length 50cm is heated from 40oC to 80oC. If the linear...

Correct Answer: Option A

Explanation

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