[" 21.If "vec F=2vec i+3j+4vec k" acts on a hody and displaces it by "vec S=3vec y+2j+5vec k" ,then the work done by "],[" the force is "]

If vec F =2 hat i + 3hat j +4hat k acts on a body and displaces it by vec S =3 hat i + 2hat j + 5 hat k , then the work done by the force is

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

If a force vec(F) = (vec(i) + 2 vec(j)+vec(k)) N acts on a body produces a displacement of vec(S) = (4vec(i)+vec(j)+7 vec(k))m , then the work done is

A particle is displaced from a position (2 vec i - vec j + vec k) metre to another position (3 vec i + 2 vec j -2 vec k) metre under the action of force (2 vec i + vec j -vec k) N. Work done by the force is

(3vec i+4vec j-5vec k)*vec i=

(vec i + xvec j + 3vec k) xx (vec i-vec j + vec k) = 5vec i + xvec j-3vec k then x =

If vec a xx i+2vec a-4vec i-2vec j+vec k=0 then vec a=

vec i + vec j + vec k, 4vec i + vec j + vec k, vec 4 + 5vec j + k Then the position vector of the circumcentre of the Delta ABC is

vec a=2vec i+3vec j-vec k,vec b=-vec i+2vec j-4vec k and vec c=vec i+vec j+vec k then find thevalue of (vec a xxvec b)*(vec a xxvec c)