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jbphys303

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## Homework Statement

A uniform density sphere is released such that it has an angular speed of 10 rev/sec and no initial linear velocity. The angular velocity vector is perfectly perpendicular to the linear momentum vector. Initially the ball slips as it moves along the surface, but after time t pure rolling without slipping begins.

The coefficient of friction between the sphere and the surface is 0.21.

The radius of the ball is 0.08m

mass sphere= 7.3 kg

w= 10 rev/sec

#1: How fast is the ball rolling at time t?

#2: How long did it take to reach this speed?

#3: How much energy was lost between time t=0 and t=t?

## Homework Equations

Rotational Inertia (I)=2/5mr^2

kinetic energy (rotational)= 1/2Iw^2

ke= 1/2mv^2

v=rw

## The Attempt at a Solution

I think I can figure it out once I know how much energy is lost by friction

So far I set up the following equation

1/2Iw^2-(energy lost by friction)= 1/2Iw(final)^2+ 1/2mv^2

Any help would be appreciated

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