If I have an 500kg object on a sloped road (30degrees from the ground) traveling in circle of 200m radius, how do I find the speed needed to have no friction? Do I use the 30degree angle or the 60degrees to calculate the magnitude of the normal force?

If I have a 500kg object on a sloped road (30degrees from the ground) traveling

in a circle of a 200m radius, how do I find the speed needed to have no friction?  Do I use the 30degree angle or the 60degrees to calculate the magnitude of the normal force?

 
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