Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.
Trending News
physics problem truss forces?
Determine the magnitude of the force in each member of the truss shown in the figure below. A little tricky where to begin. Obviously start with point B and I get F-Fbc cos 30 = 0
That would give you Fbc but I'm not sure if I'm supposed to use cos 30 or cos 90? Any help please? Where do I go from here?
The diagram is here >> PLEASE COPY AND PASTE IT AND REMOVE THE SPACE BETWEEN tinypic and the .COM yahoo wont let me show the link on here for some reason. thank you. http://i42.tinypic/ .com/28i930o.jpg
the bottom most length along A to C is 12' but that doesn't seem to help much. Am I missing what you are saying?
Right, I got that by using F-FbcCOS30=0 then solving for Fbc = 2309
Now Im a little confused with finding Fba..
Using FbcSIN30 - FbaSIN60 = 0 plugin Fbc.. not sure if FbaSIN60 is the right way to go. Is this the correct method?
1 Answer
- 10 years agoFavorite Answer
Do you have any lengths for the sides? You could try to sum the moments about A.
EDIT:
The lengths are very important. Solve your triangle with trig functions, which is simple enough. I think you should use sin 60. Which would give you a force of Fbc=2309N in compression. Then just go from there.