physics--latent heat
2008-01-06 7:12 am
A chef uses an electric steamer to cook a fish. The steamer heats water causing steam to rise through holes in the base of the food compartment. The steamer is rated at 600W and initially contains 0.5 kg of water at a temperature of 20 ℃. The fish has to be steamed for 12 minutes after the water has reached its boiling point of 100 ℃. Calculate the maximum mass of water that could be converted to steam in this time.
回答 (2)
2008-01-06 7:46 pm
✔ 最佳答案
Let the max mass be m. Assume no energy loss,
by E = mcΔT , E = ml and E = Pt,
( 600 )( 12 )( 60 ) = ( 0.5 )( 4200 )( 100 - 20 ) + ( m )( 2.26 x 10^6 )
432000 = 168000 + 2.26 x 10^6 m
m = 0.117kg ( 3 s.f. )
2008-01-06 11:49:13 補充：
In the above calculations, energy given out by the steamer = energy required to raise the temp. of water from 20*C to 100*C + energy required to convert mkg of 100*C water into steam By this condition, you can set the equation and solve for m.
參考: My Phy Knowledge
2008-01-10 7:38 am
Mass = 0.117kg
收錄日期: 2021-04-23 19:31:48
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