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?

Thanks

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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.

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

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