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April 20, 2014

April 20, 2014

Posted by **sandhya** on Thursday, October 14, 2010 at 6:17am.

- physics -
**drwls**, Thursday, October 14, 2010 at 7:29amSet the moment about the ladder/wall contact point equal to zero. Assume the ladder has no mass. (That is probably not a good assumption, but they did not provide a value). Let the ladder length be L, and the distance of the ladder bottom from the wall be x. The person's weight (980 N)cancels out. 0.34 is the STATIC friction coefficient. The normal force of the ground on the bottom of the ladder is 980 N.

(x/4)*980 + sqrt(L^2 -x^2)*0.34*980 = x*980

3x/(4L) = 0.34*sqrt[1 - (x/L)^2]

0.5625*(x/L)^2 = 0.1156[1 - (x/L)^2]

0.6781*(x/L)^2 = 0.1156

x/L = 0.413

- physics -
**sandhya**, Thursday, October 14, 2010 at 8:09amthanks for your timely help.

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