Why do many earthquakes and volcanoes occur along the ring of fire?

In the image, the arrow is pointing to a celestial object. which attribute disqualifies the object from being a planet?

A0.580-kg rock is tied to the end of a string and is swung in a circle with a radius of 0.500 meters. the velocity of the rock is 4.50 m/s. what is the centripetal force acting on the rock? 15.5 n 5.22 n 69.8 n 23.5 n

Derive the formula 2as=v² -u² where the formula have have usual meanings