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Exercises 13. An object which moves in a circular path is acted upon by a centripetal acceleration of 12.0 m/s2. It makes 4 revs in 10 seconds. a) Calculate the radius of its orbit. b) Calculate the speed at which the object is moving. 14. An object of mass 2.50 kg is tied to the end of a string 0.80 m long, and is swung in a horizontal circle with UCM such that it makes 8.00 revs in 6.00 seconds. Find: (a) Period (b) Velocity (c) Centripetal acceleration 15. The car in the following figure is moving clockwise around a circular section of road at a constant speed. What are the directions of its velocity and acceleration at (a) position 1 and ( b) position 2? N * 2