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Homework question, need help asap, please

by jks8686
Tags: asap, homework
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Jan24-08, 12:17 PM
P: 1
1. The problem statement, all variables and given/known data

In an old-fashioned amusement park ride, passengers stand inside a 3.0-m-tall, 5.0-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 0.60 to 1.0 and a kinetic coefficient in the range 0.40 to 0.70.

2. Relevant equations

T = 1/f

and so the people dont slide

(coefficient of friction) (Fn)= mg

( (coefficient of friction)*m*v^2)/ r = mg

3. The attempt at a solution

(coefficient of friction) = (g*r)/ (v^2)

T = (2*pi*r)/ square root of ((g*r)/(coefficient of friction))

and f= 1/T

I got 0.4068 = f
but the program says I am wrong
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Jan24-08, 12:25 PM
berkeman's Avatar
P: 41,106
What did you use for the coefficient of friction? What did you use for the radius?
Doc Al
Jan24-08, 12:29 PM
Doc Al's Avatar
P: 41,477
Assuming that the question was to find the minimum frequency to insure that they wouldn't slide, it looks OK to me. How was the question phrased exactly?

Jun18-09, 02:02 PM
P: 1
Homework question, need help asap, please

The 0.4068 is rotations in a second. You had to multiply that value by 60 to put it into rotations per MINUTE.

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