physics
posted by hopsy on .
Here is the problem and answers. how do i reach the answer?
A car at the Indianapolis500 accelerates uniformly from the pit area, going from rest to 325 km/h in a semicircular arc with a radius of 198 m.
Determine the tangential acceleration of the car when it is halfway through the turn, assuming constant tangential acceleration.
6.55m/s2
Determine the radial acceleration of the car at this time.
20.6m/s2
If the curve were flat, what would the coefficient of static friction have to be between the tires and the roadbed to provide this acceleration with no slipping or skidding?
2.2

tangentialacceleration:
vf^2=Vi^2+2ad where d is half the turn, or PI*198/2 Be certain to convert Vf to m/s
radial acceleration= V^2/r where V is in m/s.
Force=m*v^2/r
mu*mg=m v^2/r
solve for mu. 
If this question is Webassign related, you may have to 1/2 the answers you plug into the textbox, like I did.
Bub Pursley describes it correctly.