Kinematics/Newtons Laws Physics

[McKeavey]

Homework Statement

A 400 N force points due Northwest.

a) In what direction must a 700 N force point so that the net force points due west?
b) What is the magnitude of the net force?

Homework Equations

No Clue..

The Attempt at a Solution

Answer says its..
a) [S66`W]
b) 923 N

Thanks for helping..:)

 

[shyta]

Draw a vector diagram, then use relevant information from the question to help you with the values.

you might find a/sin(a) = b/sin(b) useful here if you have learned this identity before.