Friction

[shinn90]

Q1
http://img187.imageshack.us/img187/5202/f1xj9.th.png (http://img187.imageshack.us/my.php?image=f1xj9.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 (http://img187.imageshack.us/my.php?image=f2co6.png)
is the answer 398.5 kg?

http://img187.imageshack.us/img187/5175/f3ix6.th.png (http://img187.imageshack.us/my.php?image=f3ix6.png)

is the answer 189.5 kg?

http://img179.imageshack.us/img179/8738/f4fv4.th.png (http://img179.imageshack.us/my.php?image=f4fv4.png)

is the answer 36.5 N?

[moemoney]

I dont 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.