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? asked in Science & MathematicsPhysics · 6 years ago

I know i have to use m=q/c(change in temp.) and change in L=L initial*alpha*change in temp. but how do i find temp?

When 3850 J of heat are added to a 0.13-m-long silver bar, its length increases by 4.03 10-3 m. What is the mass of the bar

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  • oubaas
    Lv 7
    6 years ago
    Favorite Answer

    λ ℓ ag = 19*10^-6 °C^-1

    4.03*10^-3 = 0.13*λ ℓ ag*ΔT

    ΔT = 4.03*10^-3*10^6/(0.13*19) = 1632 °C

    Q = m*c ag*ΔT

    c ag = 239 J/KG/°C

    m = 3850/(1632*239) = 0.010 kg (10 gr)

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