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Central Force (HELP)


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#1 Moss600

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Posted 19 September 2005 - 11:09 AM

Having real problems with reccent homework ex. The question involves being able to derive alpha=rw^2 for the centripetal acceleration of an object.
The answers prob really simple but I've spent ages on this question and I'm still confused sad.gif


#2 werlop

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Posted 19 September 2005 - 01:41 PM

Can you post the actual question? The derivation that you are talking about should be in your notes.
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If you can keep your head when all about you
Are losing theirs and blaming it on you,
If you can trust yourself when all men doubt you
But make allowance for their doubting too,
If you can wait and not be tired by waiting,
Or being lied about, don't deal in lies,
Or being hated, don't give way to hating,
And yet don't look too good, nor talk too wise:
Yours is the Earth and everything that's in it,
And--which is more--you'll be a Man, my son!

#3 werlop

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Posted 19 September 2005 - 05:41 PM

Basically you want to know something like this I would imagine:

\[
\begin{array}{l}
 F = \frac{{mv^2 }}{r} \\ 
 v = r\omega  \\ 
 v^2  = r^2 \omega ^2  \\ 
 F = \frac{{mr^2 \omega ^2 }}{r} \\ 
 F = mr\omega ^2  \\ 
 \end{array}
\]
Click here to visit the Bearsden Academy Website
user posted image


If you can keep your head when all about you
Are losing theirs and blaming it on you,
If you can trust yourself when all men doubt you
But make allowance for their doubting too,
If you can wait and not be tired by waiting,
Or being lied about, don't deal in lies,
Or being hated, don't give way to hating,
And yet don't look too good, nor talk too wise:
Yours is the Earth and everything that's in it,
And--which is more--you'll be a Man, my son!





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