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To = 35 C
Tt = 175 C
Ao = 80 cm2
α = 1,7x10⁻⁵/C
Ditanyakan : At ?
Dijawab :
At = Ao (1 + 2α x (Tt-To)
= 80 (1 +2x1,7x10⁻⁵ x (175-35))
= 80 (1 + 3,4x10⁻⁵ x 140)
= 80 (1 + 0.00476)
= 80,3808 cm²