3) A car rounds a circular curve of radius 80.0 m banked at 15⁰
to the horizontal at 30.0 m/s. What is the coefficient of friction
required for the car not to skid? Some hints. first, set the x-axis
as horizontal, and the y-axis as vertical (this is different than
how we normally handle inclines). Second, there will be 3 forces:
the normal force (with x- and y- components), the force of gravity
(y-component only), and friction pointing down the...