An ice -making machine can change 1kg of water at 20C into ice at 0C in 2 mins.
What is the average energy removed from the water by the machine every second ?
thx
F3 Physics Question in book ~
2007-04-26 5:52 am
回答 (1)
2007-04-26 7:39 am
✔ 最佳答案
Heat removed for 20oC water to 0oC water= mCΔT
= (1) (4200) (20-0)
= 84000 J
Heat removed for 0oC water to 0oC ice
= mL
= (1) (334000)
= 334000 J
Average energy removed per second
= (84000 + 334000) / (2 x 60)
= 3483 J s-1
收錄日期: 2021-04-12 22:28:10
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