Monday

September 1, 2014

September 1, 2014

Posted by **joe** on Monday, March 31, 2014 at 7:09pm.

Distance from wall =

- physics -
**bobpursley**, Monday, March 31, 2014 at 9:33pmsum moments about the top of the ladder.

Is this a weightless ladder? the ladder weight is not given.

clockwise positive, and my sketch has clockwise toward the wall.

d is the distance from base to wall

Theta is the base angle, so d/5.7=sinTheta

sum moments about the top wall junction point with the ladder.

W*(.24*5.7*970g sinTheta)-970g*.76*5.7*cosTeta*mu=0

(the sum of the moments about any point is equal to zero)

divde thru by cosTheta, then solve for tanTheta, then d=5.7cosTheta

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