The tube shown in figure is of unifrom corss-section. Liquid flows through it at a constant speed in the direction shown by arrows. Then the liquid exerts on the tube is:

Options

A. a net force to the right
B. a net force to the left
C. a clockwise torque
D. an anticlockwise torque

Answer

C

Explanation

The force exerted by the liquid at the bends is shown. The liquid undergoes change in momentum at these points. The two force from a couple exerting a clockwise torque.