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## Homework Statement

A hanging 4 kg mass is connected by a weightless cord on a pulley to a 3 kg mass which rests on a smooth surface. The pulley has frictionless axle and I=.5kgm^2 and r=.3m. The cord does not slip on the pulley. Find the acceleration of the two masses and the tensions of the strings (one between pulley and 3kg mass, and the other between pulley and 4 kg mass)

## Homework Equations

F=ma

Rotational kinematics equations...not sure which ones to use...

## The Attempt at a Solution

I figured that downward force would be 4g. I thought about dividing that by 7+I=7.5 to get acceleration but that doesn't work. Correct acceleration is 3.12m/s^2 and tensions are 26.7 and 9.37 N.

Thanks,

sphoenixee