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## Homework Statement

A pulley (in the form of a uniform disk)

with mass 79 kg and a radius 14 cm is at-

tached to the ceiling in a uniform gravita-

tional field and rotates with no friction about

its pivot. The masses are connected by a

massless inextensible cord.

Determine the acceleration of the mass

33 kg. The acceleration of gravity is 9.8 m/s2 .

Assume up is positive. Answer in units of

m/s2.

## Homework Equations

Net Torque = Moment of Inertia *Angular Acceleration

Torque = Force * Radius

## The Attempt at a Solution

I attempted this:

I*Alpha = net toque

1/2MR^2*(A/R) = (56-33)*9.8*R

M*A=23*9.8*2

A=(23Kg*9.8m/s/s*2)/(79Kg)

Unfortunately that didnt work...

Thanks for any help.