Posted by **sandhu** on Tuesday, November 23, 2010 at 8:28am.

A 3670 lb car going around an unbanked curve at a constant speed of 25 mph begins to slide (ěs=0.55 and ěk=0.45). What is the radius of the curve?

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**drwls**, Tuesday, November 23, 2010 at 10:04am
The static coefficient of friction, which you call ěs=0.55, is the one to use.

Equate the centripetal force to the friction force, and solve for R. The mass of the car will cancel out.

0.55 g = V^2/R

Solve for R.

25 mph = 36.67 ft/s

g = 32.2 ft/s^2

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**sandhu**, Tuesday, November 23, 2010 at 11:28am
thanks a lot

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