Re: [Phys-l] waves on a string

["Jeffrey Schnick" <JSchnick@Anselm.Edu>]

Thanks John.  Good eye.

> -----Original Message-----
> From: phys-l-bounces@carnot.physics.buffalo.edu [mailto:phys-l-
> bounces@carnot.physics.buffalo.edu] On Behalf Of John Denker
> Sent: Thursday, December 09, 2010 2:59 PM
> To: Forum for Physics Educators
> Subject: Re: [Phys-l] waves on a string
>
> On 12/09/2010 12:04 PM, Jeffrey Schnick wrote:
>
> > Could you specify two of the equations that don't pass the
> dimensional
> > analysis test.  I didn't check them all when I read the article but
> the
> > ones I did check passed the test.
>
> Consider the un-numbered multi-step equation near the bottom of
> page L75:  The LHS looks like an energy.  As we move from step
> to step, we lose a factor of τ and then lose a factor of dx.
> The RHS doesn't have units of energy *and* doesn't scale like
> dx the way it should.
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