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=120 × 0,000017 × 40
=0,0816 cm
lt=lo+ΔL
=120+0,0816
=120,0816 cm
Lo= 120 cm
Δt= 60-20= 40 °C
α= 0,000017 /°C
Dit:
Lt=..?
Penye:
Lt= Lo(1+α.Δt)
Lt= 120(1+0,000017×40)
Lt= 120(1+0,00068)
Lt= 120×1,00068
Lt= 120,0816 cm