a low friction pulley, which can be modeled as a 0.800 kg solid cylinder with a radius of 30.0 cm, has a rope going over it as shown in the diagram. the tension in the rope is 10.0 n on one side and 12.0 n on the other. both tension forces are tangential to the pulley. what is the angular acceleration of the pulley? write the answer to three significant figures.