A metal bar 2m long expands by 1.2mm when heated from 20 degrees C to 140 degrees C. The coefficient of linear expansion for this metal is?

👨🏻‍🏫 學術台物理學

[匿名]

2016-06-20 5:44 am

回答 (1)

fooks

2016-06-20 5:58 am

ΔL = Lₒ α ΔT
α = ΔL / (Lₒ ΔT)

Coefficient of linear expansion, α
= (1.2/1000 m) / [(2 m) × (140 - 20)°C]
= 5 × 10⁻⁶ /°C

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