Homework Help: Physics

Posted by Sarah on Wednesday, June 16, 2010 at 6:01pm.

A 5.0 g coin is placed 15 cm from the center of the turntable. THe coin has static and kinetic coefficients of friction with the turntable surface of us=.8 and uk=.5. THe turntable very slowly speeds up to 60 rpm. Does the coin slide off?

Physics - MathMate, Wednesday, June 16, 2010 at 8:02pm
Centrifugal force, Fc
= mrω²
r=0.15m
m=0.005kg
ω=60 rpm
=60*2*π/60s
= 2π s^-1

Static frictional force, Fs
= mμ_s

If Fc>Fs, the coin will slide off, since μ_s > μ_k.
Physics - Chud master, Thursday, October 6, 2011 at 10:53pm
answer is actually no

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