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Homework Help: Max speed please help!

  1. Sep 30, 2007 #1
    A flat (unbanked) curve on a highway has a radius of 220.0 m. A car rounds the curve at a speed of 21.0 m/s.

    What is the minimum coefficient of friction that will prevent sliding?

    Suppose the highway is icy and the coefficient of friction between the tires and pavement is only one-third what you found in part A. What should be the maximum speed of the car so it can round the curve safely?

    Can someone help me. I don't know what to do for the second part. I found the minimum coefficient to be .205 but i cant find the maximum speed.

    Is the equation squareroot of coefficient of friction divided by radius?
  2. jcsd
  3. Sep 30, 2007 #2


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    Homework Helper

    How did you get the first part? use the exact same relationship... just use coefficient of friction is 0.205/3. this time you're using the same equation... just solving for v.
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