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December 22, 2014

December 22, 2014

Posted by **Matt** on Wednesday, January 20, 2010 at 7:44pm.

1) find x and y components of v1 and v2?

2) find magnitude of the sum v1+v2?

3) find the angle of the sum v1+v2?

I found the answers to part 1 (v1= -6.4,0 and v2= 4.5,7.7) and part 2 (8.0) but need help with part 3. thanks!

- physics -
**Damon**, Wednesday, January 20, 2010 at 8:02pmI assume 60 degrees in the +y direction

V1x = -6.4

V1y = 0

V2x = 8.9 cos 60 = 4.45 agree

V2y = 8.9 sin 60 = 7.71 agree

Vx= -6.4 + 4.45 = -1.95

Vy= 0+ 7.71 = 7.71

sqrt(Vx^2+Vy^2) = 7.95 agree

tangent of angle above -x axis = 7.71/1.95

= 3.954

so that angle = 75.8 degrees above -x axis

which is

180 - 75.8 = 104.2 degrees counterclockwise from +x axis

ALWAYS sketch a graph !!!!

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