# Homework Help: Centrifuge carnival ride

1. Dec 11, 2008

### ahrog

1. The problem statement, all variables and given/known data
A ride has a diameter of 4.8 N and makes 2 complete rotations in 5.0s.
a) Determine the speed of the rider.
b)What is the centripetal acceleration of the rider?
c) What is the coefficient of friction required to keep the rider from slipping downwards when the floor drops down?

2. Relevant equations
v= (2$$\pi$$r)/T
Fc=MAc
coefficient of friction=F/N

3. The attempt at a solution
a) v= (2$$\pi$$2.4)/2.5s
=6.0
b) Ac= (6s)2/2.4m
=15
c) I don't get how to get this....

2. Dec 11, 2008

### LowlyPion

Draw a force diagram.

You have the weight down = m*g

You have the centripetal force = m*v²/r that is radially outward pressing the rider into the ride.

Now you should also know that the Maximum force of friction is μ * the normal force which is your centripetal force in this case.