What sport was invented to keep athleates warm in the winter

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

To a of 4 x hz is 1. 0. mm nm nm

Is there a point between a 10 nc charge and a 20 nc charge at which the electric field is zero?