15. A cube that has sides of length L is made of a metal with a coefficient of thermal linear expansion α. What is the approximate ratio of the change in the volume to the original volume as temperature rises by ΔT? (Assume αΔT＜＜1.)
(A) 3αΔT
(B) 6αΔT
(C) α³ΔT
(D) α(1+α)²ΔT.

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