Question

A question for stars and mods

A uniform disc of radius R is spinned about its axis to an

angular velocity

ω_0

and then carefully placed with its plane

on a rough horizontal surface. The time in which the disc

stops rotating is found $\displaystyle\sf\dfrac{y\omega_0}{4\mu gr}$
.Find y. Given the coefficient

of friction between the disc and the surface =
μ. Assume

that the disc exerts pressure on the horizontal surface

uniformly.​

Answer 1

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