" 81."quad |vec 2i-3vec j+vec k|=

| 2vec i-3vec j + vec k | =

The value of 'a',for which the points A,B,C with position vectors 2vec i-vec j+vec k+vec k,vec i-3vec j-5vec k, and avec i-3vec j+vec k are vertices of a right angled triangle with /_C=(pi)/(2) are

The values of a for which the points A,B,C with position vectors 2vec i-vec j+vec k+vec i-3vec j-5vec k and avec i-3vec j+vec k,vec i-3vec j-5vec k and avec i-3vec j+vec k are the vertices of a right angled triangle with /_C=(pi)/(2) are

Find lambda if the vectors vec a= vec i+3 vec j+ vec k , vec b= 2 vec i- vec j- vec k and vec c= lambda vec i+7 vec j+ 3 vec k are coplanar

The position vectors of the points A and B are vec i + 2 vec j + 3 vec k and 2 vec i - vec j - vec k respectively. Find the projection of vec (AB) on the vector vec i + vec j + vec k . Also find the resolved part of vec (AB) in that direction.

The sine of the angle between the vectors vec i+3vec j+2vec k and 2vec i-4vec j+vec k is

The area of the triangle formed by the points whose position vectors are -3vec i+vec j,5vec i+2vec j+vec k and vec i-2vec jmath+3vec k is

The line of intersection of the planes vec r*(3vec i-vec j+vec k)=1 and vec r*(vec i+4vec j-2vec k)=2, is

If vec r = 3vec i + 2vec j-5vec kvec a = 2vec i-vec j + vec k, vec b = vec i + 3vec j-2vec k and vec c = -2vec i + vec j-3vec k such that vec r = lambdavec a + muvec b + deltavec c then mu, (lambda) / (2), delta are in? (A) AP (B) GP (C) HP (D) AGP