Calculating Minimum & Maximum Speed for an Icy Curve

[physicsgirlie26]

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 can't find the maximum speed.

Is the equation squareroot of coefficient of friction divided by radius?

 

[learningphysics]

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.