Is there anything else you'd like to check?

[Topher925]

I feel like an idiot asking this, but I need a check on a derivation. Can anyone verify this for me or let me know if its wrong?

Homework Statement

Expand the equation.

Homework Equations

0 = m\frac{d}{dr}(\frac{1}{r}\frac{d}{dr}(ru))

The Attempt at a Solution

\frac{d2u}{dr2}+\frac{1}{r}\frac{du}{dr}-\frac{u}{r2} = 0

or

u'' + u'/r - u/r² = 0

 

[tiny-tim]

Expand the equation.

0 = m\frac{d}{dr}(\frac{1}{r}\frac{d}{dr}(ru))
…
u'' + u'/r - u/r² = 0

Hi Topher925!

Yes, that's fine.

 

[Topher925]

Hi Topher925!

Yes, that's fine.

Crap. I was afraid someone was going to say that.