Question
Sun May 06, 2012 By:
 

The sum of three forces F1=100N, F2=80N, and F3 = 60N acting on a particle is zero What is the angle between F1 and F2 ?? PROPER DIAGRAM with full logic explaination plz !

Expert Reply
Wed May 09, 2012
 
from vector formula:
602=802+1002+2x80x100 cos?
cos?=-0.85
?=148.2°
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