a) In the gure below, what are the components of 171, v3, and 173? [1] ('21-1) (-11'4) Figure 1 b) What is the cosine of the angle between 171 and 172? [2] C) What is 11] 1 123 + 1752,? Does your answer make sense? [2] (1) Given two vectors EL = [a1,a2, a3] and I; = [b1, b2, 193] which are parallel, write down expressions for b17b2 and b3 in terms of a1,a2,a3 and a constant c. [l] e) Hence, use the denition of the cross product to show that the cross product of two parallel vectors is the null vector. [2] [8 total]