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April 18, 2014

April 18, 2014

Posted by **Tia** on Wednesday, November 7, 2012 at 12:47pm.

- Physics, Someone please help me! -
**Damon**, Wednesday, November 7, 2012 at 1:11pmI do not have your picture but if it is a cantilever beam with a cable making a 12 degree angle with the boom 2/3 of the way out we can make some progress.

first what force up is required 2/3 of the way out? Lets call the back 10 units long so there is a 420 N force down at 5 units from the base and a 160 N force down at the tip.

the moments around the base are 420*5+160*10

= 2270 Nm

that must be balanced by the upward component of the muscle tension T

T sin 12 * 6.67 units = 2270

so the tension T = 1637 N or about ten times the weight we are lifting

Now of course we alsoget a compression in the boom(spine) equal to T cos 12 = 1601 N

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