Two point charges each experience a 1.8-N electrostatic force when they are 2.4 cm apart. If they are moved to a new separation of 8.2 cm, what is the magnitude of the electric force on each of them

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