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Q. A thin aluminium plate has a surface area of 1,500 m 2 at 20 ° C. What will be its surface area when it is cooled to - 20 ° C?
(Take the linear expansivity of aluminium to be 2 . 5 × 10 - 5   K - 1 )
 

Dear Student,


A0=1500 m2 A=A01+β-40=15001-2.5*10-5*40=1500-1.5=1498.5 m2Regards

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