The first problem is "at an amusement park there is a ride in which cylinrically shaped chamber spin around a central axis. People si in seats facing the axis, their backs against the outer wall. At one instant the outer wall moves at a speed of 3.2m/s and an 83kg person feels a 560N force pressing against his back. What is the radius of the chamber?
Second question- "A car is safely negotiating an unbanked circular turn at a speed of 21m/s. The maximum static frictional force actson the tires. Suddenly there is a wet patch in the road reduces the maximum static frictional force by a factor of three. If the car is to continue safely around the curve, to what speed must the driver slow the car?
For the first problem, i used Fc=mv^2/r
so r=mv^2/Fc.....r=(38kg)(3.2m/s^2)/560N=.69, but the answer should be between 1-2. Where am i going wrong?
The Attempt at a Solution
I have no idea where to start for the second question