Unsure of what to do with HP Prime

[KerryVS]

Hi, I recently bought the HP prime for one of my modules at university. We need it to calculate the Colebrook - White and Darcy Weisbach equation ( V = -2 * sqrt(2*g*D*Sf) * log(ks/3.7D + 2.51v/D*sqrt(2*g*D*Sf)) using iterations for the Sf value. Would I need to program the equation into the calculator so that it's always readily avaliable or do I need to type it in manually each time into the solve function.  

[Maké]

Hi!, @KerryVS:

Your solution is create one program, for solve. Can use, LOCAL, RETURN, etc ...

See, the example ... MOPMT ... of Eddie Shore, from ... http://edspi31415.blogspot.com.ar/2013/10/hp-prime-programming-tutorial-1-local.html

The Fluid Dynamics, is ... https://fluiddynamics.eu/2013/03/10/colebrook-white-and-darcy-weisbach-combined/

You can use App ... Solve and change the letters of variables by other's admited, as ...

 

The result, is with random values, of variables. With the variables writed, you needed, press Solve.

 

See, the Wolfram Alpha, for any help ... http://www.wolframalpha.com/input/?i=Coolebrook-White+equation

Too, use ... http://www.hpcalc.org/details/7681

Note: IMHO, for friction factor is better, if use Chen equation ... https://youtu.be/bf4Q9hd5zvc

[Tim_Wessman]

I'd take a look at the "Solve" App that lets you store lots of eqations. Also, the solve app chapter in the manual or in the built in help. you have 300 pages of contextual help in the calc. 🙂