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Anand Rananaware Grade: 11
        4] Two vectors having equal magnitudes A make an angle ? with each other. The magnitude and direction of the resultant are respectively:


(a) 2Acos ? /2, along bisector

(b) A cos ?/2, at 45 from one vector

(c) A cos ?/2, along bisector

(d) A sin ?/2, along bisector
6 years ago

Answers : (1)

Fawz Naim
37 Points
										

the resultant of the two vectors will lie along the bisctor


resultant R=sqr root(A^2+A^2+2.A.Acos?)


=sqr root(A^2+A^2+2A^2cos?)


=sqr root(2A^2+2A^2cos?)


=sqr root(2A^2[1+cos?])


=A*sqr root(2[2cos^?/2])


=A*2cos?/2


2Acos?/2. therefore option (a) is correct

6 years ago
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