Friction and tension equilibrium problems with three setups

[shinn90]

Q1
http://img187.imageshack.us/img187/5202/f1xj9.th.png

M is on the point of sliding:
0 = MA g - T => T = MA g ... (1)
0 = T - (0.35)(150 g) ... (2)
Substitute (1) into (2) : MA = (0.35)(150) = 52.5 kg.

http://img187.imageshack.us/img187/787/f2co6.th.png
is the answer 398.5 kg?

http://img187.imageshack.us/img187/5175/f3ix6.th.png

is the answer 189.5 kg?

http://img179.imageshack.us/img179/8738/f4fv4.th.png

is the answer 36.5 N?

 

[moemoney]

I don't think the second one is correct. I stopped right here because it was tideous to do all the solutions just to check your answers. Post your way of solutions.