Finding tangential acceleration of a rotating disk

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Homework Help Overview

The discussion revolves around finding the tangential acceleration of a rotating disk, utilizing the equation for tangential acceleration, which involves the radius and angular acceleration.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to apply the formula for tangential acceleration but questions the correctness of their calculation based on the answer key. Some participants suggest that the answer key may be incorrect, while others express agreement with the original poster's approach.

Discussion Status

The discussion is ongoing, with multiple participants supporting the original poster's calculation. There is a lack of consensus regarding the accuracy of the answer key, and some participants are exploring the implications of this discrepancy.

Contextual Notes

AfronPie

Homework Statement


Attached.

Homework Equations


Tangenital acceleration=r*alpha

3. The Attempt at a Solution

I thought it was just simply r*alpha=2*20=40 (choice A), but the answer key says choice B. I'm not really sure where I could have went wrong or its possible that there is a mistake in the answer key.
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Any insight would be very helpful. Thanks.
 
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Stick to answer A. Key's wrong.
 
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I think you are correct..

http://spiff.rit.edu/classes/phys211/lectures/tang/tang_all.html
 
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BvU said:
Stick to answer A. Key's wrong.
Thanks.
 
I calculate 79 m/s² for the centripetal acceleration (towards the center).
 
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