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Centripetal Acceleration and Tangential Acceleration problem driving me crazy! 
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#1
Oct2208, 12:54 AM

P: 1

A car is tested on a 230 m diameter track.
If the car speeds up at a steady 1.2 m/s^2, how long after starting is the magnitude of its centripetal acceleration equal to the tangential acceleration? it seems simple, but i just cant seem to get it!... find: change in time when centripetal acceleration = tangential acceleration. r = 115 m. a = 1.2 m/s^2 (which type of a, i dont know) centripetal accel = v^2/r or w^2/r tangential accel = (radius)(angular accel) i tried setting them equal to each other obviously, but no luck. can someone help me out!?!? 


#2
Oct2208, 03:52 AM

P: 203

>> centripetal accel = v^2/r or w^2/r
centripetal accel = v^/r NOT w^2/r >> tangential accel = (radius)(angular accel) Nope, tangential accel is simply the acceleration given in the problem statement  1.2 m/s^2 What speed must the car be going to give it a centripetal acceleration equal to 1.2 m/s^2 ? How long will it take to reach this speed? Make sense? 


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