A) \[\rho {{v}^{2}}A\]
B) \[\rho vA/w\]
C) \[\rho ghA\]
D) \[{{v}^{2}}A/\rho \]
Correct Answer: A
Solution :
[a] Using equation of continuity, \[Av=2A{{v}_{1}}\Rightarrow {{v}_{1}}=\frac{v}{2}\] Let a small volume having mass 'dm? then \[{{P}_{i}}=dmv\,\,\,\,{{P}_{f}}=0\] \[dp=dmv\] \[F=\frac{dp}{dt}=\left( \frac{dm}{dt} \right)v=\rho A{{v}^{2}}\]You need to login to perform this action.
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