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a = 0,000019/°C
lo = 250 cm
T1 = 20°C
T2 = 120°C
^T = 120 - 20 = 100°C
Dit :
^l/pertambahan panjang?
Jawab :
^l = lo × a × ^T
= 250 cm × 0,000019 × 100
= 0,475 cm