Posted by **katie** on Wednesday, December 8, 2010 at 11:07am.

ladder of mass m and length l leans against a frictionless wall at an angle of 60 degrees. The coefficient of static friction between the ladder and ground is 0.45. A man whose mass is 4 times the ladder climbs up. How far up the ladder can he go before he slips?

- physics -
**bobpursley**, Wednesday, December 8, 2010 at 12:07pm
Katie, you have two conditions that must be met.

1) the sum of forces in any direction is zero.

2) THe sum of moments about any point is zero.

So, draw the figure. Sum forces in horizontal, and vertical equations: that gives you two equations.

Sum moments about any point on the ladder, I suggest the base.

With these three equations, you have it.

## Answer This Question

## Related Questions

- Physics - A uniform ladder of length L and mass m leans against a frictionless ...
- Physics - A ladder, 5.0 m long, leans against a frictionless wall at a point 4.0...
- Physics - A uniform ladder of mass m = 6.5 kg and length l = 2.1 m leans at an ...
- physics - ) A uniform ladder of mass m and length leans at an angle against a ...
- physics - A uniform ladder of mass m and length L leans at an angle θ ...
- please help asap! - A ladder, 5.0 m long, leans against a frictionless wall at a...
- Physics - Equilibrium - A uniform ladder of mass M and length L leans at an ...
- physics - Romeo takes a uniform 13.7-m ladder and leans it against the smooth (...
- physics - Romeo takes a uniform 13.7-m ladder and leans it against the smooth (...
- Physics - Romeo takes a uniform 15.0-m ladder and leans it against the smooth (...

More Related Questions