What is the spring constant for a supermarket scale that stretches 0.01 m when a force of 4 N is applied

The 5-kg cylinder is initially at rest when it is placed in contact with the wall b and the rotor at a. if the rotor always maintains a constant clockwise angular velocity v = 6 rad> s, determine the initial angular acceleration of the cylinder. the coefficient of kinetic friction at the contacting surfaces b and c is mk = 0.2.

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A2k pendulum has a speed of 1 m/s at a height of 1/2 meter