Wednesday, November 28, 2012


I get the stuff... except with this part:

"Taking moments around the point on the wall find the tension in the cable Tc
32.81 x 9.8 x 4 x 2 = 4 x Tc sin Ø
Tc = 643.1/sin Ø N"

I get the stuff... except with this part: Why do they multiply by 2 on the left side? There is the mass of the beam and g, and multiplying them together gives weight. Then you multiply by 4 to get the moment. But what about the 2?



  1. I would have to break out my Physics book. This looks like a problem right out of "Physics for Scientists and Engineers" Yes that textbook is a keeper, BTW.

  2. The 2 comes from "2g" in the original equation, which the answerer didn't post (but I haven't looked it up).