a current generation hard drive in a computer spins at a rate of 7200 rpm. estim

Question

a current generation hard drive in a computer spins at a rate of 7200 rpm. estimate the coefficient of friction necessary for the frictional force to keep a speck of dust sitting midway between the center and outer edge from sliding off. assume the speck has a mass of 59 mg. a current generation hard drive in a computer spins at a rate of 7200 rpm. estimate the coefficient of friction necessary for the frictional force to keep a speck of dust sitting midway between the center and outer edge from sliding off. assume the speck has a mass of 59 mg.

Explanation / Answer

here,

the angular speed , w = 7200 rpm

w = 753.6 rad/s

mass of speck , m = 59 mg = 5.9 * 10^-5 kg

let the radius be r

for the speck to not move

frictional force = centripital force

uk * m * g = m * w^2 * r/2

uk * 9.8 = 753.6^2 * r/2

uk = 2.9 * 10^4

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