A boy swings a stone on a rope above his head. If the stone has a mass of 0.8 kg and the centripetal acceleration given to the stone is 1.2 m/s2, what is the centripetal force acting on the stone?

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

Light traveling in water, nwater = 1.33, strikes a plastic block at an angle of incidence of 51.4°; part of the beam is reflected and part is refracted. if the index of refraction of the plastic is 2.0, what is the angle made by the reflected and refracted beams?

Aball is thrown horizontally from a cliff at 8m/s .in what direction is the ball moving 2s later?