Angular velocity when tension equals gravity and disc moment of inertia

[Dawg]

Homework Statement

2 questions I really need help with
1) a 20g weight is attached to one free end of a 2.5m length of string, other end is attached to the ceiling. The weight is pulled to one side And released when the angle between the vertical and the string is 53.1 degrees. What is the angular velocity ofthe weight when the angular acceleration is zero

2) a uniform disc of radius 0.25m is attached to a thread of mass of 5kg. The disc has mass 10kg calculate the moment of inertia of the disc. Thanks very much any help greatly appreciated

Homework Equations

The Attempt at a Solution

 

[zack_21]

These both can easily be solved with the appropriate equations.