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## Homework Statement

Does the delay of propagation of pressure gives a torque during a short time ?

A disk full of a liquid turns at a constant angular velocity w around the red axis. At a time, a valve move out, this will increase quickly the pressure inside the liquid.

1/ Draw the lines of equal pressure from the valve

2/ Draw the forces from this additionnal pressure

3/ Is there an additionnal torque ?

## Homework Equations

Speed of sound in the fluid

## The Attempt at a Solution

**1/ & 2/**

3/ Yes, the torque from F1 is greater than F2

Is it correct ?