1) What is meant by specific latent heat of fusion of ice?
2) A 1-kW immersion heater is used to heat some melting ice. It is found that the mass of ice decreases by 350g after 2 minutes. Assume no heat is lost to the surroundings. Find the specific latent heat of fusion of ice.
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中三物理問題(20分)
2010-01-21 4:10 am
回答 (2)
2010-01-21 4:22 am
✔ 最佳答案
1.The specific latent heat of fusion of ice is the energy needed to change 1kg of ice to water without a change in temperature.
2.Mass of ice melted by heater=0.350kg
Energy supplied=1000x60x2=120000 J
i.e.The specific latent heat of fusion of ice:
Lf = Q/m
=120000/0.350
=3.42 x 10^5 J kg^-1
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參考: me
2010-01-21 4:34 am
1./Specific latent heat of fusion of ice is the energy needed to change 1 kg of ice to water without the change of temperature.
2./ lf= Q ( P= Q )
___- _ m___- _ t
lf= Pt
___-m
lf= 1000x2x60
___- 350/1000
lf= 120000
______________ 0.35
lf= 342857
lf= 3.43x10^5 J/kg (3s.f.)
2./ lf= Q ( P= Q )
___- _ m___- _ t
lf= Pt
___-m
lf= 1000x2x60
___- 350/1000
lf= 120000
______________ 0.35
lf= 342857
lf= 3.43x10^5 J/kg (3s.f.)
參考: myself
收錄日期: 2021-04-26 16:49:50
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