A flat (unbanked) curve on a highway has a radius of 220m. A car rounds the curve at a speed of 25m/s. What is the minimum coefficient of friction that will prevent sliding?

Answer 1

To prevent sliding, friction must provide (i.e. equal) the centripetal force

μmg=mv²/r

Solve for μ, with
v=25 m/s
r=220 m
g=9.8 m/s²
m cancels

Answer 2

Try exvhj

Answer 3

A physics book slides off a table with a horizontal speed of 1.10m/s . It strikes the floor in 0.350s. Ignore air resistance.
Determine:
a. The velocity just before it hits the floor.
b. The height of the table top above the floor.
c. The horizontal distance from the edge of the table to the point where the book strikes the floor.