A) \[\frac{\pi }{2}+{{\cot }^{-1}}\left( \frac{1}{\eta } \right)\]
B) \[\frac{\pi }{2}+{{\sin }^{-1}}\left( \frac{1}{\eta } \right)\]
C) \[{{\cos }^{-1}}\left( \frac{1}{\eta } \right)\]
D) \[si{{n}^{-1}}\left( \frac{1}{\eta } \right)\]
Correct Answer: B
Solution :
[b] \[\overrightarrow{{{v}_{B+g}}}=\left( v+\frac{v}{\eta }\left( \cos \alpha \right)\hat{i}+\left( \frac{v}{\eta }\sin \alpha \right) \right)\hat{j}\] Drifting \[D=\left( v+\frac{v}{\eta }\cos \alpha \right)\frac{D}{\left( \frac{v}{\eta }\sin \alpha \right)}\] \[\frac{dD}{dt}=0\] We get \[\alpha =\frac{\pi }{2}+{{\sin }^{-1}}\frac{1}{\eta }\]You need to login to perform this action.
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