S. An object moves in uniform circular motion. Its kinetic energy is directly proportional to I. the centripetal force I]. the radius of the circle [11. the period of the cirCular motion (A) I only (B) II only (C) III only (D) I and II (E) II and III Questions 6 - 8 Two small Spheres, each of mass m and of negligible radius, are connected by a massless rigid rod of length d. as shown below. 6. The gravitational force between the two spheres is (A) o (B) Cid'5' 2 0(a)! 03> 0(a): (E) 40%)1 7. The moment of inertia about an axis perpendicular to the connecting rod and through its center is (A) 0 (B) 0.25mia (C) 0.50md= (D) md2 (E) 4de 61 8. The moment of inertia about and axis which passes through the rod and both spheres is (A) 0 (B) 025de (C) 0.50mi2 (D) Ind2 (E) 4-de Questions 2 11 A ball of mass 50 grams is xed to the end of a 40 cm long string of negligible mass. as shewn below in the ' diagram. The other end of the string is tied to a xed point. The ball is free to swing on the string. Initially. , the ball is held so the string is taut and horizontal. The ball is then released and is observed to swing ina vertical plane. 9. Neglecting friction, the maximum kinetic energy of the ball as it swings is clasest to (A) 0.2} (B) 2] (C) 201 (D) 200] (E) 20001 10. Neglecting friction, the time it takes the ball to return to its original pesition is closest to (A) 0.25 (B) 0.85 (C) 1.3 s (D) 2.8 s (E) 12.63 11. The maximum tension in the string will be (A) 0.5N . (B) LON (C) 1.5N (D) 2.0N (E) 2.5N