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11. Which of the following proves that there is a total force acting on an object in uniform circular motion? a. Total force is acting on the object accelerating b. There is total force because there is no acceleration c. No total force when there is acceleration d. Total force acts only in gravitational force 12. What is the acceleration of the ball tied to a string to whirl at the radius of 40 cm with the velocity of 1.1 m/s? a. 0.3 m/s' c. 3.0 m/s2 b. 0.44 m/s' d. 44 m/s' 13. What is the centripetal force exerted to a 400 kg jeep with a velocity of 25 m/s taking its turn to the curved road with a radius of 350 m? a. 29 kg.m/s' c. 192 kg.m/s* b. 30 N d.714 N 14. What is the possible radius of curvature of a 700kg helicopter with a minimum lift of 8,000 N that travels at 100 m/s. a. 8.75 m c. 76.56 m b. 875 m d. 1142.86 m 15. What is the tangential velocity of an object moving in a circle with the radius of 15 meters in constant angular velocity of 12 rad/s? a. 180 m/s c. 0.8 m/s b. 1.25 m/s d. 9.6 m/s