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t1 = 18 cm
Lo = 20 cm
α = 0,000009 /'C
Lt = 20,18 cm
Ditanya: t2.....?
jawab:
ΔL = Lt - Lo
ΔL = 20,18 - 20
ΔL = 0,18 cm
ΔL = Lo α Δt
0,18 = 20 x 0,000009 Δt
0,18 = 0,00018 Δt
Δt = 0,18/0,00018
Δt = 1000'C
Δt = t2 - t1
1000 = t2 - 18
t2 = 1000 + 18
t2 = 1018'C