physics-----heat

Ka Yan

2008-06-03 2:37 am

Consider a boy with mass 30 kg eats 0.3 kg of ice-cream (0℃) Let us assume the specific latent heat of fusion of ice-cream is close to that of ice,i.e.334000
J/kg℃
(a)(i)It is quite safe to assue the specific heat capacity of the human body to
be close to that of water,i.e.4200J/kg℃.Why?
(ii)Do you expect the actual specific heat capacity to be lower or higher than
our estimate?Why?
(b)Calculate the body temperature after the boy's eating the ice-cream.(Given the normal body temperature is 370℃)

回答 (1)

jackie

2008-06-03 3:39 am

✔ 最佳答案

哈哈,你問既問題我上個星期對左答案(我o左嘴..d問題一樣)
1.because the human mainly contain water
2.lower, this is because the human body is not contain 100%of water ,the
other substance contained in our human body which have lower specific heat capacity,sothe actual specific heat capacity is lower
3.30x4200x(37-y)=0.3x334000
y=36.2度

參考: 100%我自己打

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