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.