confused about banked curves?

Question

On a banked race track, the smallest circular path on which cars can move has a radius r1 = 118 m, while the largest has a radius r2 = 165 m, as the drawing illustrates. The height of the outer wall is 18 m.
a) Find the smallest speed at which cars can move on this track without relying on friction.
b) Find the largest speed at which cars can move on this track without relying on friction.

Answer 1

You can't drive on a banked track without friction...

Answer 2

this is a trick question...........I hate trick question,s...........car,s rely on friction.....specifically.....TIRE,S to asphalt.....without friction the car,s could,nt move at all............not without flying off the track........unless the banked curves were at a 90* angle,to the ground......then you,d have to calculate......vehicle weight,speed needed to maintain centrifugal force,etc......................................................I tried to correct this page.....but it won,t let me...............it,s suposed to say tire,s to asphalt!