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22 February, 01:04

The coefficient of linear expansion of steel is 12 * 10-6 K-1. What is the change in length of a 25-m steel bridge span when it undergoes a temperature change of 40 K from winter to Summer?

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  1. 22 February, 03:40
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    0.012-m

    Explanation:

    ∆L = α * Lo * (T-To)

    α is the coefficient of linear expansion = 12 * 10-6 K-1

    Lo = Initial length = 25-m

    ∆L = Change in length

    (T-To) = 40 K

    ∆L = 12 * 10-6 * 25 * 40

    ∆L = 0.012-m
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