Engineering Mechanics - Force Vectors - Discussion

Discussion :: Force Vectors - General Questions (Q.No.18)

18. 

If = 20° and = 35°, determine the magnitudes of F1 and F2 so that the resultant force has a magnitude of 20 lb and is directed along the positive x axis.

[A]. F1 = 20.0 lb, F2 = 22.9 lb
[B]. F1 = 25.6 lb, F2 = 26.6 lb
[C]. F1 = 28.5 lb, F2 = 11.91 lb
[D]. F1 = 14.00 lb, F2 = 8.35 lb

Answer: Option D

Explanation:

No answer description available for this question.

Ismayil said: (Feb 15, 2017)  
Find obtuse angle of parallelogram (360-2*(20+35))/2 = 125.

Sine law: 20/sin125 = F1/sin35 = F2/sin20.
F1 = 14.
F2 = 8.35.

Sonm said: (Aug 6, 2017)  
Give More explanation.

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