Physics

I've got 2 questions here that are really making me bust a nut:

I've got an idea on how to do both, but in both instances my ideas are wrong >_>

 

For the first one:

m = -{[(cos31)(21N)]/(0.55)} - (sin31)(21N)---- divide that by 9.8 or 10.

Check to see if my sin and cos are right. Everything else should be right.

My equations:

SUM F up and down = Fn + Ry(rope) - Fg=ma
SUM F left and right = Rx - Ff=ma

 

do you have a formula for number two cause I cant find it in my book but I remember how to do the problem