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Question

# A 16cm3 volume of water flows per second through a capillary tube of radius r cm and of length 1 cm, when connected to a pressure head of h cm of water. If a tube of the same length and radius r/2 is connected to the same pressure head, find the mass of water flowing per minute through the tube

A
80 gram/min
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B
70 gram/min
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C
60 gram/min
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D
50 gram/min
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Solution

## The correct option is B 60 gram/minV∝Pr4lv2v1=(r/2r)4v216=116v2=1cm3per secv2=60cm3per minMass of water flowing per minute =v2×d=60×1=60gram/minHence option 'C' is correct.

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