help me find the tension of this pulley problem?

Question

Find tension?
I asked this question about 40 mins ago, and I got the accelerations for both, but I cant get the tension force? I got 78.4 but the problem says that it isnt right, I dont know what it could be, I tried including g just incase but it said 186.2 was wrong too, any help?

An object with mass m1 = 3.00 kg, rests on a frictionless horizontal table and is connected to a cable that passes over a pulley and is then fastened to a hanging object with mass m2 = 8.0 kg, as shown in Figure P4.30. Find the acceleration of each object and the tension in the cable.

http://i165.photobucket.com/albums/u78/RLB31384/p4-30.gif

the acceleration is 7.127272727ms^2 for both

Additional Details

28 seconds ago
believe that its either done by doing 78.4-8*7.12727 = 501.759808

but im not sure if thats right, do I include g somewhere...

Answer 1

Acting force gravitational force acting on m2. Therefore the gravitational force = m2*g =78.48 kp. This force moves both masses with acceleration a therefore a = 78.48/(8+ 3) = 7.134545 m/s^2. Since m1 resists this acceleration by a*m1 = 7.134545*3 = 21.40364 kp this will be the tension in the cable.

Answer 2

the rigidity for the area that is being pulled is 26.3 N label it as T1 Then the mass T2=m*(g+a) or T2=0.603*(g+a) now the pulley (T1-T2)*r=I*a/r I=.5*m*r^2 hence I=.5*m*r^2 26.3-0.603*(g+a)=.5*a million.35*a be sure for a