Power - Ferris Wheel with friction

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Homework Help Overview

The problem involves a Ferris wheel with a given moment of inertia, rotating at a specific speed, and the effects of friction when the motor is turned off. The original poster seeks to determine the power of the motor required to maintain the wheel's rotation against friction.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to convert the rotational speed from rev/hr to rad/s and considers using work done by friction to find power. There is uncertainty about the next steps to take.

Discussion Status

The discussion includes attempts to clarify the problem setup and the necessary calculations. Some participants engage in informal exchanges, but there is no clear consensus or resolution yet.

Contextual Notes

There is a mention of a specific class context, which may imply certain constraints or expectations regarding the problem-solving approach.

MissPenguins
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Homework Statement


A motor keep a Ferris wheel (with moment of inertia 8.95X10^7 kg X m^2)rotating at 6.3 rev/hr. When the motor is turned off, the wheel slow down (because of friction) to 3.5 rev/hr in 25 s. What was the power of the motor that kept the wheel rotating at 6.3 rev/hr despite friction? Answer in units of W.

Homework Equations


P = \DeltaW/\Deltat

The Attempt at a Solution


Well, if I interpret it correctly, I guess I have to convert 3.5 rev/hr to rad/s. Correct? And find W by FD? Sorry, I am too sure what to do. Thanks for your help.
 
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SORRY, someone else posted it already
 
You wouldn't by chance be in Professor Woods' class?
 
Bearbull24.5 said:
You wouldn't by chance be in Professor Woods' class?

I am in his class. I can tell you are since you have "Bull" in your username. ;)
 

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