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A rod of initial lenght 2m at a temperature of 25oC is heated to 80oC....

Physics
WAEC 2009
A rod of initial lenght 2m at a temperature of 25oC is heated to 80oC. Calculate the increase in length of the rod if its linear expansivity is 4.0 x 10-3K-1
  • A. 0.26m
  • B. 0.44m
  • C. 0.53m
  • D. 0.84m
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Correct Answer: Option B
Explanation
\(l_2 - l_1 = \alpha l_1 (\theta_2 - \theta_1) = 4.0 \times 10^{-3} \times 2(80 - 25)\)

= 0.44m
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