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ÎÒÊÇÊýѧרҵµÄ£¬ÊýѧµÄ¼ÆËãÎÒ¶¼»á£¬µ«ÊÇÎïÀíµÄÎÊÌ⣬²»¶®Òâ˼¡£Çë½Ì²½Ö裬ÊýѧµÄ¶«Î÷ÎÒ×Ô¼º¿ÉÒÔÍê³É¡£ 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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