- #1
avsj
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Homework Statement
A 2.8m radius drum (cylinder) rotates such that a person does not fall when the "floor" falls away (imagine the person being pushed against the inside wall of the cylinder, with no bottom to the cylinder)
If the coefficient of friction between the person and the wall is 0.35, what is the maximum period of roation so that a personw ill not fall?
Homework Equations
Fg= mg
Ff=uFn
Fc = m4r(pi^2)/T^2
where T is period
The Attempt at a Solution
I am confused with the directions of the forces. Fg will go down the inside wall, Fc is going inwards to the center, and Fn ...? But, Fn should = Fg, so Ff = umg
Then I thought to equate this umg to Fc, and solve for T but I don't get the correct answer, which is 2.0s
THanks,