A glass window is to be fit in an alumin...

A glass window is to be fit in an aluminium frame. The temperature on the working day is `40^@C` and the glass window measures exact `20 cm xx 30 cm`. What should be the size of the aluminium frame so that there is no stress on the glass in winter even if the temperature drops to `0^@C`? Coefficients of linear expansion for glass and aluminium are `9.0 xx 10^(-6 @)C^(-1)` respectively.

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The correct Answer is:

20.012 cm and 30.018 cm

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