# College Physics

posted by
**JP**
.

The rotor is an amusement park ride where people stand against the inside of a cylinder. Once the cylinder is spinning fast enough, the floor drops out.

A-What force keeps the people from falling out the bottowm of the ride?

I think that it's the Normal force?

B-If the coefficient of friction is 0.40 and the cylinder has a radius of 2.5m, what is the minimum angular speed the of the cylinder so the people don't fall out?

Do I use NL #2 Sum F=mv2/r

which=ma(sub)c ??

Also, how do I set up the math to solve for the angular speed?

Thank you