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Ditanya : Δl?
Penyelesaian :
α = 0,000017/°C itu untuk tembaga.
ΔT = T - T₀
= 78°C - 28°C
= 50°C
Δl = L₀ * α * ΔT
= 80*0,000017*50
= 0,068 m <--
semoga membantu :)