Number 1 and 2 show all work

1) A circular off ramp has a radius of 57.0 m and a posted speed limit of 50.0 km/h. If the road is horizontal, what is the minimum coefficient of friction required? 2) A car travels at speed v around a frictionless curve of radius r that is banked at an angle O to the horizontal. Show that the proper angle of banking is given by tan(0) =