Angular Acceleration and wheel revolution

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SUMMARY

The discussion centers on calculating the number of revolutions a wheel makes while accelerating from rest to 59 rad/s with an angular acceleration of 29 rad/s². Participants clarify that the equation for angular displacement can be derived from the kinematic equations of motion, specifically using the relationship between angular velocity, angular acceleration, and time. The key equation to use is Angular Displacement = (Final Angular Velocity² - Initial Angular Velocity²) / (2 * Angular Acceleration), which allows for the calculation of displacement without needing time. This method provides a direct solution to the problem presented.

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Homework Statement



A wheel accelerates from rest to 59 rad/s at a rate of 29 rad/s². How many revolutions the wheel turned while accelerating?

Homework Equations

The Attempt at a Solution



I'm confused, I suck at this kind of problem. I got change in angular velocity which would be 59rad/s, and I got that the angular acceleration would be 29 rad/s². What equation relates all three? All equations I know relate them using time, but I got no time there.
 
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The equation you are looking for is an EXACT analog of the equation for linear motion, s=(1/2)*a*t^2. Does that help?
 
Not really. See that would translate into angular motion as this:

Angular Displacement = 1/2*Angular Acceleration*Time²

And since I got no time, that equation is useless. I need an equation that somehow relates ONLY angular displacement to angular velocity and angular acceleration

Unless I'm missing a way to get the time from the given data...
 
Well, you know the initial velocity, the final velocity and the acceleration. Could that give you a time?
 
...could it?
 
I would say that if I accelerate from 0 to 10 m/sec at an acceleration of 10 m/sec^2, then the time it takes is 1 sec.
 

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