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9. A ball of mass m- 30 g that is attached to the ceiling by a light string is swinging around in a circle in the xy-plane, as shown. The string makes an angle θ-30° with the vertical. The length of the string is r- 40 cm. What is the magnitude of the torque on the ball about the fixed end of the string due to gravity? a) 0.0402 mN b) 0.0588 m N c) 0.0633 m N 0.0675 mN e) 0.0756 mN

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