How Do You Calculate Acceleration and Tension in a Two-Crate Pulley System?

[SailorMoon14]

Two packing crates of masses m1 = 10.0 kg and m2 = 4.50 kg are connected by a light string that passes over a frictionless pulley as in the figure. The 4.50 kg crate lies on a smooth incline of angle 39.0°.

a) Find the acceleration of the 4.50 kg crate.

b) Find the tension in the string.

See the figure at this link: http://www.webassign.net/sf/p4_26alt.gif

I appreciate any input anyone can give me

 

[SGT]

What are the forces acting on each crate?
The sum of the forces is the product mass x acceleration.