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ΔL = L₀ × α × ΔT
= 100 cm × 0,000012/°C × ( 120 - 20 )°C
= 0,12 cm
b).
Lт = L₀ + ΔL
= 100 cm + 0,12 cm
= 100,12 cm
ΔL = Δt . α . Lo
(120-20) . 0,000012 . 100
100 . 0,000012 . 100
0,12 cm
b.
L = Lo + ΔL
0,12 + 100 = 100,12 cm