Answers

2014-05-22T20:55:19+05:30
If two equal forces acting at a point with an angle Ф then magnitude of resultant force is 
= 2Fcos(Ф/2)
20√3 = 2Fcos(60/2)
10√3 = F√3/2
F = 20 N
hence magnitude of each force = 20 N
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2014-05-23T07:02:20+05:30
Resultant =  \sqrt{A^2+B^2+2ABcos \alpha } where angle between two forces is α.....
here α is 60* and both A and B are equal...let them be x....

 \sqrt{x^2+x^2+2x^2cos60} = 20√3
2x²+2x²(1/2) = 1200
3x²              = 1200
x²                = 400
x                 = 20
therefore magnitude of each of the forces is 20N...
thanks for reading......:)
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