Finding tangential acceleration of a rotating disk

AI Thread Summary
The discussion revolves around calculating tangential acceleration for a rotating disk using the formula tangenital acceleration = r * alpha. The original poster calculated the tangential acceleration as 40, but the answer key suggests a different answer, leading to confusion. Several participants agree with the original poster's calculation, asserting that the answer key is likely incorrect. Additionally, one participant mentions calculating centripetal acceleration as 79 m/s². The consensus leans towards supporting the original calculation of 40 as correct.
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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