- #1

joemama69

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## Homework Statement

A particle of mass m moves in a horizontal circle of radius R on a rough table. It is attached to a horizontal string fixed at the center of the circle. The speed of the particle is initially v0. After completing one full trip around the circle, the speed of the particle is v0/2.

a) Find the energy dissipated by friction during one revolution in terms of m, v0, and R.

b) What is the coefficient of kinetic friction?

c) How many revolutions will the particle make before coming to rest?

d) Suppose the experiment is repeated with one slight modification: the initial speed of the particle is doubled. How many revolutions does the particle make in this case?

## Homework Equations

## The Attempt at a Solution

I need some help withthe friction part

.5Iw

_{o}

^{2}= .5Iw

^{2}- Friction energy

is the friction energy F = umg

.5Iw

_{o}

^{2}= .5Iw

^{2}- umg