The length of the rod at 60 degree Celsius is 1.010025m.
It defines the material's property of expanding when temperature is increased.
The change in length related to the coefficient of linear expansion is given by
ΔL = αLΔT
where ΔT is the change in temperature, L is the original length and ΔL is the change in length.
Substitute the values from question, we get the coefficient of linear expansion as
α = ΔL /LΔT
α = (1.005-1) / 1 x(40-20)
α= 2.5 x 10⁻⁴ /°C
Length at 60°C, L' =1.005 [1 + 2.5 x 10⁻⁴x (60-40)]
L' = 1.010025 m
Thus, the length at 60°C is 1.010025 m
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