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[求助] 我是数学专业的,遇到两个流体力学的问题请教

我是数学专业的,数学的计算我都会,但是物理的问题,不懂意思。请教步骤,数学的东西我自己可以完成。

1.Water flows through a Venturi tube, a circular tube of radius 2 cm which contracts to 1.5 cm and then enlarges again to radius 2 cm. The pressure difference between the normal and contracted region generates a height difference of 10cm in a column of water manometer. Find the rate of flow through tube in litres per second. Take g to be 10m/s2; 1 litre = 103 m3.

2. Water has to be pumped up a tube from a tank 10 metres vertically below the tube’s upper opening to form a fountain. Water leaves the tank slowly and emerges from the top of the tube at atmospheric pressure with velocity 10 metres/sec. Find the pressure needed in the tank in newtons per square metre. (Take atmospheric pressure as 105 N/m2, the density of water as 1000 kg/m3 and g = 10 m/s2.)
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