How Do You Solve for Acceleration and Tension in a Pulley System?

[gen007]

Homework Statement

http://img69.imageshack.us/img69/2429/phyq1.jpg

Homework Equations

to find the acceleration of the 2 objects and the Tension Force.

The Attempt at a Solution

since only 1 pulley used, a=a1=a2, then
m1a=T (1)
m2a=-T+m2gsin45 (2)

i wonder what happen to the m2gcos 45?? and is the 2 equations right for my assumption? thanks

 

[ideasrule]

m2gcos45 is the normal force applied by m2, which isn't really important unless friction is considered (or unless it's so big that something breaks).

 

[gen007]

but is the 2 equations right? because i am still ponder over m2a=-T+m2gsin45 or m2a=T+m2gsin45 ?? really sad my basic wasnt good...