本题目来源于试卷: 美国2021年物理杯赛真题 PHYSICS BOWL 2021，类别为 美国物理杯赛(Physics Bowl)
[单选题]
A hole with a radius of 1.0 mm develops in the bottom of a 15 m tall tank filled to the top with water.The tank is open at the top. At what rate will water initially flow out of the hole?
A. $5.4 *10^{-3 }m^{3} /s $
B. $5.4 *10^{-4 }m^{3} /s $
C. $5.4 *10^{-5 }m^{3} /s $
D. $5.4 * 10^{-6 }m^{3} /s $
E. $5.4 *10^{-7 }m^{3} /s $
参考答案: C
本题详细解析:
$gph=\frac{1}{2}pv^2$
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