Question

Three physical quantities are given by the following vectors: !
F1 = (4.0ˆi + 6.0 ˆj) N
F2 = (2.5ˆi − 5.0 ˆj) N
r = (4.0ˆi + 4.0 ˆj) m
a) What is the magnitude and direction of the vector F1?
b) Draw a diagram showing the vectors F1 and F2,
together with the vectors F1 + F2 and F1 − F2.
c) Find the quantity Fr = r . F1.
d) Find the vector τ = r × F1.