The resultant of two vectors vecA "and"vecB is perpendicular to vecA. Magnitude of Resultant vecR is equal to half magnitude of vecB . Find theangle between vecA"and"vecB?

The resultant of two vectors vecA "and"vecB is perpendicular to vecA.

1.	The resultant of two vectors vecA "and"vecB is perpendicular to vecA. Magnitude of Resultant vecR is equal to half magnitude of vecB . Find theangle between vecA"and"vecB?
Answer» SOLUTION :Since `VECR ` is perpendicular to `vecA `. Figure SHOWS the THREE vectors `vecA,vecB"and vecR`. Angle between `vecA`and `vecB` is `pi-theta` `sintheta =R/B=B/(2B)=1/2` `rArr theta rArr 30^(@)rArr "angle "vecA `between and `vecB` is `150^(@)`