2. A 110-gram block is attached to a 75.0-cm string and made to go around in circles at a constant rate of 108 rpm on a frictionless, horizontal table. a) What is the angular velocity in rad/s? b) What is the centripetal acceleration in SI units? String c) Draw a free body diagram for the block labeling the forces for the moment shown in the picture above. On the side, identify and write down which of those is the centripetal force. d) Calculate the magnitude of the centripetal force in Sl units.