A tube of length 20 m and radius r m carries a steady flow of a liquid whose density and viscosity are 2 kgm−3 and 1 kgm−1s−1, respectively. The velocity of the fluid at a distance x from the centre of the tube is given as 
. If the friction force exerted by the liquid on the tube is 
N, then what is the value of r?
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Your question seems to be incomplete with some values missing.
Kindly post it again for us to answer.
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