1.

The resultant of \[\overrightarrow{P}\] and \[\overrightarrow{Q}\] is perpendicular to \[\overrightarrow{P}\]. What is the angle between \[\overrightarrow{P}\] and \[\overrightarrow{Q}\]

A.      \[{{\cos }^{-1}}(P/Q)\]
B.           \[{{\cos }^{-1}}(-P/Q)\]
C.      \[{{\sin }^{-1}}\,(P/Q)\]
D.      \[{{\sin }^{-1}}\,(-P/Q)\]
Answer» C.      \[{{\sin }^{-1}}\,(P/Q)\]


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