Question

Let \(\bar a\) = 2i – j + 2k and \(\bar b\) = 6i + 2j + 3k

(i) Find a unit vector in the direction of \(\bar a + \bar b\)

(ii) Find the angle between a and b

Answer 1

(i) \(\bar a + \bar b = 8i + j + 5k\)

(ii)