(Phy) heat question

myloveareyou

A cup of mass 0.04 kg contains water of 0.1 kg at 10度.
How much boiling water must be added to the cup to raise its temperature to 40度?
( the specific heat capacity of the cup is 700 jkg-1度-1)

maxycy

回復 1# myloveareyou
點解依家重有人問phy既-口-''

0.04x700(40-10)+0.1x4200x(100-10)=mx2.26x10^6
38640=mx2.26x10^6
m=0.01709...
m≈0.02kg

總覺得做錯-口-''

[S]【YU】

緊係錯啦,人地寫明boiling water, 你仲做乜加個 latent heat of vaporisation 落去呢?

0.1 x 4200 x (40-10) + 0.04 x 700 x (40-10) = m x 4200 x (100-40)

maxycy

緊係錯啦,人地寫明boiling water, 你仲做乜加個 latent heat of vaporisation 落去呢?

0.1 x 4200 x (40-1 ...
[S]【YU】 發表於 24-4-2010 22:08

係啵...
閣下果然屈-3-

[S]【YU】

我從來都唔屈人

adamsteve

我從來都唔屈人
[S]【YU】 發表於 25-4-2010 12:44

但係你成日屈人機喎

[S]【YU】

無D咁既事.
我只係講返個事實出黎je.