First slide

Thermal expansion

Question

The length of each steel rail is 10m in winter. The coefficient of linear expansion of steel is 0.000012/°C and the temperature increases by 15°C in summer. The gap to be left between the rails

Moderate

A

0.0018m
B

0.0012m
C

0.0022m
D

0.05m

Solution

$l_{2} - l_{1} = l_{1} a (t_{2} - t_{1})$

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