Rotational Equilibrium and Dynamics Question

[ryomaechizen]

1) If you go to this site it has the question already set up. the one I need help on is question number 62, the picture frame one. I know that the answers are already given but I want to know how this is set up.

http://www.phys.uvic.ca/vannetten/phys102/Assignments/t1a9p.pdf

2) A uniform ladder 8.00 m long and weighing 200.0 N rests against a smooth wall. The coefficient of static friction between the ladder and the ground is 0.600, and the ladder makes a 50 degree angle withthe ground. How far up th eladder can an 800.0 N person climb before the ladder begins to slip?

Thanks in advance

 

[Cyrus]

Sum the moments about the line passing through T2 and P (This will eliminate both), this will give you the tension for T1. Now Sum moments at the line through T2 and T1 to find P (this will eliminate T2 and T1), and then sum forcess to find P.