Two pennies, A and B, are on a record turntable that is rotating at 33 revolutions per minute. Penny A is farther from the center than penny B. The next four questions refer to the motion of the pennies. 10. The net force on Penny A is (A) constant and directed radially outward. (B) greater than that on Penny B. (C) zero (D) in the same direction as the velocity of the penny. 1 1. At each instant the acceleration of Penny A is (A) less than the acceleration of Penny B (B) zero (C) directed radially inward directed radially outward 12. Which penny has the greater speed? (A) Penny A (B) Penny B (C) The speed is the same for both. (D) More information is needed for a comparison. 13. If Penny A should slide off the turntable, what would be its motion just as it leaves the table? (A) Radially outward (B) Radially inward (C) along a tangent and in the direction of rotation of the table (D) along a tangent and opposite the direction of rotation of the table 14. An object weighing 4 newtons swings on the end of a string as a simple pendulum. At the bottom of the swing, the tension in the string is 6 newtons. What is the magnitude of the centripetal acceleration of the object at the bottom of the swing? (A) O (B) .59 (C) g (D) 1.59 (E) 2.5 g 15. The force of gravity keeps the moon in a nearly circular orbit around the earth. If that force was "turned off", the moon would move: (A) along a tangent to its original orbit (B) directly away from the earth (C) toward the earth (D) perpendicular to the plane of its original orbit