The piston $C$ moves vertically between the two smooth walls as shown in $($Figure $1)$

Part A

If the spring has a stiffness of $k=22l\frac{b}{i}n.,$ and is unstretched when $=0,$ determine the couple $M$ that must be applied to $AB$ to hold the mechanism in equilibrium when $=30.$ Express your answer to three significant figures and include the appropriate units.

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Figure

$1$ of $1$