A high-speed jet of air issues from the 40-mm-diameter nozzle A with a velocity v of 240...

A high-speed jet of air issues from the 40-mm-diameter nozzle A with a velocity v of 240 m/s and impinges on the vane OB, shown in its edge view. The vane and its right-angle extension have negligible mass compared with the attached 6-kg cylinder and are freely pivoted about a horizontal axis through O. Calculate the angle θ assumed by the vane with the horizontal. The air density under the prevailing conditions is 1.206 kg/m³. State any assumptions.