How to Solve for Unknown Forces in Equilibrium Truss Problems?

AI Thread Summary
To solve for unknown forces in equilibrium truss problems, applying equilibrium equations is essential. The user calculates the force at point C (Fce) but seeks clarification on how to derive forces Fbe and Fbd. The calculated values are Fbd = 95.6 kip, Fbe = 41.1 kip, and Fce = 58.4375 kip. A participant explains that "kip" refers to a kilo-pound, which is a unit of force. Understanding these calculations and units is crucial for resolving truss problems effectively.
mistophiles
Messages
1
Reaction score
0
http://www.unm.edu/~hr/images/test/problem.bmp

I am stuck trying to see how to apply the equilibrium equations. I take the moment about point b and get Fce. I need Fbe, and Fbd.

Fbd = 95.6 kip
Fbe = 41.1 kip
Fce = 58.4375 kip

These are the answers. I don't know how they got Fbd and Fbe, any clues??
 
Last edited by a moderator:
Physics news on Phys.org
what units are you working in. I've never heard of 'kip' being used. Ca you tell me what that is.

Regards,

Nenad
 
It's a kilo-pound.
 
I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
Thread 'A cylinder connected to a hanging mass'
Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
Back
Top