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Engineering Mechanics - Force Vectors - Discussion

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

F1 = 20.0 lb, F2 = 22.9 lb
F1 = 25.6 lb, F2 = 26.6 lb
F1 = 28.5 lb, F2 = 11.91 lb
F1 = 14.00 lb, F2 = 8.35 lb
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
2 comments Page 1 of 1.
Sonm said:   8 years ago
Give More explanation.
Ismayil said:   9 years ago
Find obtuse angle of parallelogram (360-2*(20+35))/2 = 125.

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