(e) The coefficient of linear expansion is 250.18 101.8 10C .100 CD/DTα−−Δ×===×°Δ°18. (a) Since A= πD2/4, we have the differential dA= 2(πD/4)dD. Dividing the latter relation by the former, we obtain dA/A= 2 dD/D. In terms of Δ's, this reads 2for 1.ADDDΔΔΔ=3We can think of the factor of 2 as being due to the fact that area is a two-dimensional
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