Calculating Torque of Spring Actioned Piston

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To calculate the torque of a spring-actioned piston when the spring is released, two key equations are necessary. The first is Hook's Law, which relates the force exerted by the spring to its compression. The second equation can be derived from a free body diagram, illustrating how the force from the spring translates into torque on the wheel based on the wheel's angular displacement. Understanding these principles will enable accurate torque calculations. This approach provides a foundational understanding for solving the problem presented.
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hi guys, this is my first post (and i am don't know much physics), i have a problem that I've ilustrated in a drawing that i attach to this post. Ok so it goes something like this ... if the spring is compressed manually , when i release it how do i calculate the torque of the wheel?
this is the link to the drawing :
http://i50.tinypic.com/2rfvn21.jpg
 
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can some1 help me with this problem??
 
Two equations will be most useful to you. One will be simple Hook's law for the spring. The other you can derive from a simple free body diagram, to show how force at the spring converts to torque to the wheel as a function of angular displacement of the wheel.
 

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