A) \[2a{{v}^{2}}\rho \,\cos \theta \]
B) \[a{{v}^{2}}\rho \,\cos \theta \]
C) \[2av\rho \,\cos \theta \]
D) \[av\,\cos \theta \]
Correct Answer: A
Solution :
The normal force acting on the wall = Rate of change of momentum of water jet \[=mv\,\cos \theta -(-mv\,cos\theta )\] \[-2\,mv\,\cos \,\theta \] \[=2(volume\,\times density)vcos\theta \] \[=2(av\rho )v\,cos\,\theta =2a{{v}^{2}}\rho \cos \theta \]You need to login to perform this action.
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