Asked by Help! final next weel

A circular steel plate of radius 15 cm is cooled from 300∘C to 80∘C.

Part A
By what percentage does the plate's area decrease?
Answered by Elena
for stell α=(11-13) •10⁻⁶ K⁻¹
take α=12•10⁻⁶ K⁻¹

ΔA=A₀2 αΔT
ΔA•100%/A₀=2αΔT•100%=
=2•12•10⁻⁶ 220•100%= 0.528%
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