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Old Jan 27th 2011, 06:51 PM   #1
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Statics: Resultant force

I've been working on this problem for a while now and basically came down to 3 equations with 3 unknowns.

0=[(-2/7 F_b) + (2/7 F_c)]

-F_r = [(-6/7 F_b) - (6/7 F_c)]

0= [(3/7 F_b) + (3/7 F_c) - 1500 N]

Not sure how to go about this one.
F_c, F_b, F_r ?

Thanks
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Old Jan 27th 2011, 09:55 PM   #2
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You can take the first and the last equation since then you deal with only two unknowns and two equations.

You can use elimination, by first removing the fractions, ie. multiply throughout by 7, then the LCM of 2 and 3 is 6, multiply the first one by 3 and the last equation by 2 throughout. Add both to get F_b.

Then solve for F_c, and used both to get F_r
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