pada suhu 25 derajat panjang logam 40 cm. ketika dipanaskan bersuhu 125 derajat panjang logam 40,044. koeisien muai panjang ialah
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Δt = t₁ - to = 125°C - 25°C = 100°C
ΔL = L₁ - Lo = 40,044 cm - 40 cm = 0,044 cm
Ditanyakan : α
Penyelesaian : α = ΔL : (Lo . Δt)
= 0,044 : (40 . 100)
= 0,044 : 4000
= 0,000011/°C