Wateris poured into a
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Water is poured into a
2014-04-30 12:56 am
回答 (11)
2014-04-30 5:16 pm
✔ 最佳答案
dh/dt=? fot t=5min of V'=25π(cc/min)Ans:60(deg) cone => R=h√3V=V'*t=πh*R^2=πh*3h^2=3πh^3......(1)Eq.(1)': V'=9πh^2*h'.........(2)Eq.(1): h=(V't/3π)^(1/3).....(3)(2),(3):h'=V'/9πh^2=V'/9π(V't/3π)^(2/3)=[(V'/3π)^(1/3)]/[3*t^(2/3)]=(25/3)^(1/3)/[3*5^(2/3)]=0.23112(cm/min)
2014-05-30 4:40 pm
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2014-04-30 11:37 am
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20140429000015KK07420