Solve 63 and 64. g
Prove that a • (b x a)
61. Fihd R, if the vectors
2 MARKS QUESTIONS
(CBSE
= ; +3; + k. b are coplanar. (CBSE2015'
Find a vector of magnitude 5 units, and parallel to the resultant of the vectors a
and b
(CBSE 2011)
63' Find a vector a of magnitude 5Ji , making an angleof with x-axis, — withy-axis andan
acute angle 0 with z-axis.
(CBSE
If the vectors and 3; — ; +4k represent two side vectors AB and AC respectively of
triangle ABC, then find the length of median through A.
(CBSE 15)
65. If a and b are unit vectors, then what is the angle between a and b for a —c b tobea
unit vector?
66. If la + bl —60, In—bl = 40 and lal 22, then find lb l.
(CBSE 2016)
(CBSE Sample
