College Physics

The Daytona 500 stock car race is held on a circular track that is approximately 2.25 miles long, and the turns are banked at an angle of 32.5°. It is currently possible for cars to travel through the turns at a speed of about 189 miles per hour. Assuming that these cars are on the verge of slipping into the wall of the race track (since they are racing!), find the coefficient of static friction between the tires and the track.

I was thinking that if I used square root (gr x (uscos + sin/cos-ussin))= v
...but I am not sure how to solve for mu_s

Any help would be great!

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  1. The tyres they use are friction ready, so they usually bank the turn at 14.8 degrees

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  2. A singly charged ion of unknown mass moves in a circle of radius 13.5 cm in a magnetic field of 5.4 T. The ion was accelerated through a potential difference of 1.0 kV before it entered the magnetic field. What is the mass of the ion?

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