A small disk $($mass $5$ kg $,$ radius $30$ cm $,$ and thickness $3$ mm $)$ is attached to a stand and is free to rotate about an axle as shown in $($Figure $1).$ The disk is held in the position shown and released, allowing it to swing downward $($toward the vertial part of the support$).$

Figure

$1$ of $1$

Part A

What is the angular acceleration of the disk the moment it is released?

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Part B

What is the angular acceleration of the disk when it reaches its lowest point $($when it has swung to be directly below the axle$)?$

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Part C

If the disk starts at rest when it is released from the position shown, what is its angular speed at its lowest point?

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