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So the question...

A 49.2 kg car is moving at 12.6 m/s around a horizontal curve whose radius is 31.3 m. What is the magnitude of the fictional force required to keep the car from sliding?

and this is what I did..

I found my net force for x and y

Fy = may

Fy = 0

N- W = 0

N = mg

Fx = max

fs = max

u x N = m(v^2/r)

so then I substituted in my N and got

u x mg = m(v^2/r)

and I solved for u (frictional force...I'm just using u for the term)

u x (49.2kg)(9.81m/s^2) = (49.2kg)(12.6^2/31.3m)

and it works out to be 0.517 and the computer is telling me I'm wrong once again. so I must be wrong.