In winter , a cup of water at 10℃ is too cold for drinking. How much boiling water must be added to raise the temperature of 0.1kg of the cold water and the cup to 40℃ ? ( The cup has a mass of 0.04 kg and its specific heat capacity is 700 J kg^-1 ℃^-1.)
唔該幫幫我丫@@'
How much boiling water must be added.....??? help me plz.
2007-10-02 2:26 am
回答 (1)
2007-10-02 2:51 am
✔ 最佳答案
E=mc(delta T)Let m be the mass of the boiling water added
By conservation of enegy
Energy absorbed= Energy released
0.1 (4200) (40-10) + 0.04(700)(40-10) = m(4200) (100-40)
m = 0.0533kg
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