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24 June, 00:10

At 20∘C, the hole in an aluminum ring is 2.800 cm in diameter. You need to slip this ring over a steel shaft that has a room-temperature diameter of 2.804 cm. 1. To what common temperature should the ring and the shaft be heated so that the ring will just fit onto the shaft? Coefficients of linear thermal expansion of steel and aluminum are 12*10-6 K-1 and23*10-6 K-1 respectively.

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  1. 24 June, 00:49
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    To measure increase in length due to thermal expansion, the formula is

    L₂ = L₁ (1 + α t) where L₁ length increases to L₁ due to rise in temperature by t.

    L₂ in both the case is same so

    for aluminium

    L₂ = 2.8 (1 + 23 X 10⁻⁶ t)

    for steel

    L₂ = 2.804 (1 + 12 X 10⁻⁶ t)

    2.8 (1 +.000023t) = 2.804 (1 +.000012 t)

    Solving this equation

    t = 122C

    Final temperature of both = 122 + 20 = 142 C
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