Thursday

October 30, 2014

October 30, 2014

Posted by **Kimmy** on Sunday, November 10, 2013 at 11:50pm.

- College Physics -
**Damon**, Monday, November 11, 2013 at 12:17amIf the two lines are attached at the same point on the branch so a triangle is formed, then the center of gravity of the plank, hiker system must be directly below the attachment point.

mass of plank = 2.25 * length

for length (.5L)^2 = 21.78^2 - 10.89^2

(.5 L)^2 = 474.4 - 118.6

.5 L = 18.9

L = 37.7 meters long

so mass of plank = 2.25*37.7 = 84.9 kg

now balance

how far is G from center of plank?

tan(22.3) = x/10.89

x = 4.47

so how far is left end from G?

18.9 - 4.47 = 14.4

so m(14.4) = 84.9(4.47)

m = 26.4 kg

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