Giancoli 7th Edition textbook cover
Giancoli's Physics: Principles with Applications, 6th Edition
Static Equilibrium; Elasticity and Fracture
Change chapter

9-1 and 9-2: Equilibrium
9-3: Muscles and Joints
9-4: Stability and Balance
9-5: Elasticity; Stress and Strain
9-6: Fracture
9-7: Arches and Domes

Problem 12
FA=2.6×102NF_A = 2.6 \times 10^2 N
FB=1.9×102NF_B = 1.9 \times 10^2 N
Giancoli 6th Edition, Chapter 9, Problem 12 solution video poster

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By lrp3395 on Thu, 12/1/2011 - 2:15 PM

can someone explain why to find fbx you use sine instead of cosine?

By kaam.wilson on Sun, 3/10/2019 - 11:02 PM

why was the substitution necessary
I don't understand that part

By Mr. Dychko on Tue, 4/2/2019 - 7:27 PM

Are you referring to the substitution at 3:25? "Substitution" is a strategy for solving sets of related equations (technically called "simultaneous" equations. These are equations that all contain the same variables for the same physical situation). Substitution replaces an unknown variable with an expression containing a different variable, and this process goes on until we're left with an equation containing only one variable, which we can then solve for. Chapter 4 of might be helpful.

By danewiren on Sun, 11/17/2019 - 10:22 PM

at 4:15 you say and write tan53 instead of tan37. Oh, you caught it a minute later. haha, nice!

By Mr. Dychko on Mon, 11/18/2019 - 5:45 PM

Thanks for keeping an eye on things though :)

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