Water flows out of a big tank along a horizontal tube \(AB\) of length \(l\) and radius \(r\) and bent at right angles at the other end as shown in the figure. The rate of flow is \(Q m^3/s\) . Calculate the magnitude of the moment of the force exerted by the water on the tube about the end \(A\).
(The surface is horizontal, not as in the figure)
Density of water=\(1kg/m^3\),
\(Q\) = \(4m^3/s\) , \(r\)=\(4m\) , \(l\)=\(\pi\)(in \(m\))