# Homework Help: Finding minimum angular speed? in rpms

1. Oct 29, 2009

### dubsydub14

Finding minimum angular speed?? in rpms

In an old-fashioned amusement park ride, passengers stand inside a 5.5-m-diameter hollow steel cylinder with their backs against the wall. The cylinder begins to rotate about a vertical axis. Then the floor on which the passengers are standing suddenly drops away! If all goes well, the passengers will "stick" to the wall and not slide. Clothing has a static coefficient of friction against steel in the range 0.61 to 1.0 and a kinetic coefficient in the range 0.40 to 0.70. A sign next to the entrance says "No children under 30 kg allowed."

What is the minimum angular speed, in rpm, for which the ride is safe?

I know i need an equation that relates mass and the coefficiant frictions to the angular speed but im having no such luck

any feedback or help would be greatly appreciated

2. Oct 29, 2009

### lylos

Re: Finding minimum angular speed?? in rpms

What forces are going to be acting on the passengers?

How does the coefficient of friction play into finding the frictional force?

These questions should get you started on getting an answer.