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Bearbull24.5

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## Homework Statement

A motor keep a Ferris wheel (with moment of inertia 6.22 × 107 kg · m2) rotating at 14 rev/hr. When the motor is turned off, the wheel slows down (because of friction) to 9.3 rev/hr in 28 s.

What was the power of the motor that kept

the wheel rotating at 14 rev/hr despite fric-

tion?

Answer in units of W.

## Homework Equations

W=(1/2)Iw(f)^2-(1/2)w(i)^2

P=Tau*w

w= angular momentum

## The Attempt at a Solution

I really want to use the first equation to solve for work but I am unsure if I can use the angular momentum values that are given or if I need to convert them