Question

A water jet strikes a vertical wall elastically at angle $\theta$ with the horizontal. The cross sectional area of the pipe is A, density of water is D and the speed of water jet is v. the normal force acting on the wall is

• A. $DAvcos\theta$
• B. $DA{v}^{2}cos\theta$
• C. $2DAvcos\theta$
• D. $2DA{v}^{2}cos\theta$

Answer 1

The correct option is B $DA{v}^{2}cos\theta$

Normal force is force $\perp$ to wall

So$,$ Normal$=$ $DA{v}^2\cos \theta$

Hence,

option $\left(B\right)$ is correct answer.