Massless particle revolving in a circle

AI Thread Summary
The discussion centers on calculating the Y-axis acceleration of a massless particle revolving in a circle with a given rotational velocity of (2+sin(a)). Two methods are proposed for finding this acceleration, both yielding different results. Participants seek clarification on the meaning of the angle "a" and whether it represents a specific angle in the context of the problem. Additionally, there is confusion regarding the term "Y-axis acceleration" and whether it refers to the Y-component of acceleration in the xy-plane. The thread emphasizes the need for clearer problem statements and visual aids to facilitate understanding.
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Given: A massless particle revolving in a circle with a rotational velocity = (2+sin(a))
To Find: Y-axis acceleration
Method #1 (from rotational acceleration)
Y-axis acceleration = (2+sin(a))(cos(a))^2
Method #2 (from Y-axis velocity)
Y-axis acceleration = (2+sin(a))(cos(a))^2-(sin(a))(2+sin(a))

Which Y-axis acceleration is correct and why?

Can someone explain this?
 
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rotational velocity = (2+sin(a))
What does this mean? Is a an angle? If so what angle?
And what do you mean by "y-axis" acceleration? Are we to assume that the circle is in the xy-plane and you are looking for the y-component of acceleration?
 
HallsofIvy said:
What does this mean? Is a an angle? If so what angle?
And what do you mean by "y-axis" acceleration? Are we to assume that the circle is in the xy-plane and you are looking for the y-component of acceleration?

You tell me. I have no clue what they are asking. :cry:
 
Post the problem EXACTLY as it appears in your text/homework. Attach any pictures that come with the problem (or describe them).
 

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