The centripetal force of an object moving in a circle varies jointly with the mass of the object and the square of its velocity and
inversely as the radius of the circle. a 7-gram object moving in a circle with a radius of 25 centimeters and at velocity of
20 centimeters per second has a centripetal force of 112 dynes. find the radius of the circle (in cm) on which of a 17-gram
object moving in a circle travels with velocity of 40 centimeters per second and the force on the object is 5,440 dynes.