1. The problem statement, all variables and given/known data A particle is moving at a constant speed around a circle of radius 1.5 meters, and it completes 4 revolutions in 6 seconds. a) What is its speed? b) What is its radial acceleration? c) In which direction does ar point? d) What is it tangential acceleration, at? 2. Relevant equations ac=v2/r T=2pie times r/v at= derivative of v/t ar = -v2/r ac = ar + at 3. The attempt at a solution a. 6=8(pie)(1.5)/v answer: 2pie v=6.28 m/s b. ar = -v2/r ar = 39.43/1.5 ar = 26.29 m/s2 c. I am not sure how to get the direction. d. ac= ar + at 26.29 = 26.29 + at at = 0???