m T2 T1 m Two blocks of masses mj and my are connected by a massless string that passes over a wheel of mass m, as shown above. The string does not slip on the wheel and exerts forces 7, and 72 on the blocks. When the wheel is released from rest in the position shown, it undergoes an angular acceleration and rotates clockwise. Which of the following statements about 7, and 72 is correct? AP Physics C: Mechanics Page 5 of 15 Scoring Guide Unit 5.3 Rotational Dynamics (A) 71 = T2 because the wheel has mass. (B) 71 = 12 because both blocks have the same acceleration. (C) 71 > T2 because my is farther from the wheel than my. (D) 71 > T2 because my accelerates upward. (E) 72 > Ti because an unbalanced clockwise torque is needed to accelerate the wheel clockwise. m1 TR No Friction Two blocks are joined by a light string that passes over the pulley shown above, which has radius R and moment of inertia / about its center. 71 and 72 are the tensions in the string on either side of the pulley and @ is the angular acceleration of the pulley. Which of the following equations best describes the pulley's rotational motion during the time the blocks accelerate? (A) magR = la (B) (T1 + T2)R = la (C) T2R = Ia (D) (12 - Ty)R = la (E) (my - mygR = laThe bar shown above is pivoted about one end and is initially at rest in a vertical position. The bar is displaced slightly and as it falls it makes an angle 6) with the vertical at any given time, as shown above. 3. Which of the following graphs best represents the baI's angula: acceleration