A student swings a rubber ball attached to a string over his head in a h circular path. The piece of string is 1.5 m long and the ball makes 120 each minute. a. What is the average velocity of the ball? b. What is the ball's centripetal acceleration? c. what is centripetal force if the mass of the rubber ball is 5 g

Four point charges each having charge q are located at the corners of a square having sides of length a. find symbolic expressions for the following. (a) the total electric potential at the center of the square due to the four charges (use any variable or symbol stated above along with the following as necessary: ke.) vtotal= (b) the work required to bring a fifth charge p from infinity to the center of the square (use any variable or symbol stated above along with the following as necessary: w=