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200,24 - 200 = 200 . α . 100
0,24 = 2 . 10⁴ α
24 . 10⁻² : 2 . 10⁴ = a
12 . 10⁻⁶
jadi koefisien muai panjang adalah 12 . 10⁻⁶
200,4 = 200 + ΔL
ΔL = 200,4 - 200
ΔL = 0,4 cm
ΔL = Lo . α . Δt
0,4 = 200 . α . (100 - 0)
0,4 = 200 . α . 100
0,4 = 20.000 . α
0,4 / 20.000 = α
α = 2 x