Consider a lawn sprinkler with horizontal arms of radius, $a=10 \mathrm{~cm}$ which has water introduced vertically through the centre, as shown in the figure. The exit area of the jet is $25 \mathrm{~cm}^2$ and the jet velocity is $1 \mathrm{~m} / \mathrm{s}$. The water is ejected orthogonal to the sprinkler arm and the jet makes an angle of $60^{\circ}$ with the horizontal plane. Find the torque $(in \mathrm{N}-\mathrm{m})$ required to hold the sprinkler stationary.
Consider water density $1000 \mathrm{~kg} / \mathrm{m}^3$. Neglect the effects of friction and gravity.
$\text{(Round off to two decimal places)}$
