A lawn sprinkler with 2 nozzeles 0.5 cm diameter each at 20cm and 15 cm radii is connected across a tap of 6 litres/minute discharge. The nozzles discharge water upwards and out wards from the plane of rotation at angles of 45^o and 30⁰ . (a)find the total torque due to nozzles A and B (b) If held stationary then angular velocity with which it will rotate freely is .