These are multiple choice:

1. If (-1, 3, 5) x (0, a, 1) = (-2, 1, -1), What is the value of a?

a) 4

b) 3

c) 2

d) 1

2. Anu is pulling her daughter in a toboggan and is exerting a force of 40N, acting at 24 degree to the ground. If Anu pulls the child a distance of 100 m, How much work was done? Hint: W =Fd cos 24degree

a) 2000 J

b) 3654 j

c) 1654 j

d) 4654 j

3. What is the volume of a box that is determined by 3 vectors a = ( 0, 1, -3), b = (1, 2, 3) and c = (-2, 0, 2)?

a) 10

b) 20

c) 30

d) 40