(Bug?) HP48 Equation Library

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(02-13-2017 05:11 AM)Han Wrote:  

(02-13-2017 02:50 AM)Mark Hardman Wrote:  Fanning friction factor.

Just to be extremely sure, you're referring to the bottom-most formula involving A and B, yes? I wonder why they chose to have the term \( (2.457 \ln( \text{blah}^{-1}))^{16} \) when it would just simplify to \( ( 2.457 \ln(\text{blah}))^{16} \) using the properties of logarithms.

It might be typically written in the format as it is in equation library, that would be the simplest answer. Engineers aren't necessary mathematicians and do not run after extreme "simplification" in formulas if this means that its "readapility" (aka ability to mirror in practice) suffers. Some fields of engineering are also extremely conservative, what comes how things are done and what formulas are used.

Simple examples are Pi*D and (Pi*D^2)/4 which are in some areas of engineering much more usefull in that format than writing with r as in mathematic is customory. That comes directly from the fact we usually measure diameter and not radius ie. with micrometer.

I myself do not know (pretty much) nothing about hydraulics.