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Water flows out of a big tank along a horizontal tube AB of length Land radius R and bends at right angle at the other end as shown inthe figure. Find moment of force exerted by water on the tube aboutthe end A. (Assume that the radius of the tube is small.)2(B) 10 pmRgHL(D) none of the above(C) 15 pTR'gHL |
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Answer» We know that, Q = AV But A = πr^2 So, V = Q/πr^2 Force = pAV^2 , p = density of water Force = p(AV)V We know AV = Q and V = Q/πr^2 So, Force = p x Q x Q/πr^2 Since , length is not negligible here,Force = pQ^2l/ πr^2 |
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