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DespicableMe
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Homework Statement
Andrew and David kick a football at the same time. Andrew kicks it with a force 155N and David kicks it with a force 210N. Angle between the two forces is 30 degrees. Calculate the magnitude and direction of the resultant force.
Homework Equations
Cosine law
The Attempt at a Solution
Magnitude = Sqrt (1552 + 2102 - 2(155)(210)cos30 )
= 108.38N
Direction: Use sine law
I don't understand why the answer at the back of the book used cos 150.
If I were to draw the diagram, would the 2 vectors appear in quadrant 2?
Are they assuming that one of the vectors is parallel to the x axis? (like this):
I was assuming that the vectors were at an angle to the x axis...