HP35s any good for EE?

[walter b]

(04-18-2015 07:48 AM)Csaba Tizedes Wrote:  And of course the material properties or beam section tables: if you calculate 250_kN*m / 45_mm^3, you want to know the result is how many MPa.

It goes without saying that units are essential. Though one should know a good set by heart. Every engineer or scientist should know that Pa = N / m^2 even at midnight. And older engineers and scientists are able to calculate in SCI 1 by heart (or by pencil on a napkin). So 250 / 45 results in some 10% more than 5, and kN*m / mm^3 = 10^3 * 10^9 N m / m^3 = 10^12 Pa, so we end with some 5.5*10^6 MPa or 5.5*10^3 GPa or ...

Keep your math neurons busy else they go on vacation for longer. BTW, that example result "feels" a bit large - did you mean cm^3 instead?

d:-)

Edited to add the napkin.