First slide

Thermal expansion

Question

The length of a metal rod at 0°C is 0.5m.When it is heated, its length increases by 2.7mm. The final temperature of rod is (coeff. of linear expansion of metal = 90 × 10^-6/°C)

Moderate

A

20°C
B

30°C
C

40°C
D

60°C

Solution

$t_{2} - t_{1} = \frac{l_{2} - l_{1}}{l_{1} a}$

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