What is the value of n in a vector= 2i + 3j and the sum of a vector + b vector = 4 m long directed towards 120 degrees of x aixs . B vector= -ni+ (2 root3-3) j?
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If r is a unit vector in the XY-plane, then r=cosθi+sinθj.
Here, θ is the angle made by the unit vector with the positive direction of the x-axis.
Therefore, for θ=30o
r=cos30oi+sin30oj
r=23i+21j.
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