The average power consumption of a typical adult is 100W in which 20% of the energy is consumed by the brain. Estimate the energy consumed by a human brain in a day.
ANS: 1.73乘以 10^6
The masses of two metal blocks A and B are in the radio of 1:3. The specific heat capacities of A and B are in the radio of 2:5. Therefore, the heat capacities of blocks A and B are in radio of...??
ans: 2:15
explain how to do!!
PHYSICS!!
2007-12-27 10:46 pm
回答 (1)
2007-12-27 11:48 pm
✔ 最佳答案
1kWh=60x60kJ=3600kJ2007-12-27 15:51:16 補充：
1. for 24hrs24x60x60x100=8640000(whole day energy consumed)20%for the brain, therefore 8640000x0.2=1.73x10^6
2007-12-27 15:55:55 補充：
2. heat capacities=specific heat capacities x masslet specific heat capacities be c, and mass be mmA:mB=1:3, cA:cB=2:5MAcA:MBcB=1x2:3x5=2:15
2007-12-27 15:59:41 補充：
sorry,打錯字MAcA:MBcB=1x2:3x5=2:15 should become mAcA:mBcB=1x2:3x5=2:15
收錄日期: 2021-04-14 10:58:06
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https://hk.answers.yahoo.com/question/index?qid=20071227000051KK02215