The ring has a mass of 0,5 kg and is resting on the surface of the table. In an effort to...

The ring has a mass of 0,5 kg and is resting on the surface of the table. In an effort to move the ring a normal force P from the finger is exerted on it. If this force is directed towards the ring’s center O as shown, determine its magnitude when the ring is on the verge of slipping at A. The coefficient of static friction at A is µa = 0.2 and at B, µB = 0.3.