Question

let s=(1m)i+(2m)j+(2m)k and t=(3m)i+(4m)k. the angle between these two vectors is given by:

Answer 1

Since S. T = |S|. |T| cos theta
Therfore cos theta=(S. T) / |S|. |T|
=(3+8)/3 *5
=11/15
Therfore theta =cos inverse(11/15)