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January 30, 2015

January 30, 2015

Posted by **Ariza** on Tuesday, May 4, 2010 at 5:44pm.

- Calculus -
**Reiny**, Tuesday, May 4, 2010 at 6:47pmDid you make a diagram?

I drew the 20 N line, and at its end drew the 50 N line with an angle of 120° between them.

(you should be familiar with the parallelogram resulting from the addition of 2 vectors with the diagonal representing the resultant R)

|R|^2 = 50^2 + 20^2 - 2(50)(20)cos 120°

= 2500 + 400 - 2000(-1/2)

= 3900

|R| = √3900 = appr. 62.45 N

now you can use the Sine Law to find the angle between either vector and the resultant.

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