Q: Units - Printable Version +- HP Forums ( https://www.hpmuseum.org/forum)+-- Forum: HP Calculators (and very old HP Computers) ( /forum-3.html)+--- Forum: HP Prime ( /forum-5.html)+--- Thread: Q: Units ( /thread-6819.html) |

Q: Units - Dirk. - 09-09-2016 03:21 PM
Hi, I did some experiment with constants and units in CAS-Mode but did not understand the result. Could somebody please explain: entered 1/SQRT(E_0*µ_0) without units and got 299792458, which seems to be the speed of light -> correct. (Of course SQRT ist the squareroot-key and everything is printed nicely on screen) Tried the same _with_ the built-in constants and units: 1 --------------------------------- SQRT(8.85..._F/m *1,2..._H/m) leads to 8.98E16_m²/(F*H) It seems to me, the square-root did not get evaluated... Adding MKSA() into the root gives 8.98...E16_m²/s² sqrt(8.98...E16_m²/s²) again leads to the result I expected in first place. The speed of light with correct units... can somebody please tell me what I'm doing wrong? RE: Q: Units - Dirk. - 09-09-2016 03:35 PM
Äh... in home it gives Error: Invalid input. But when adding MKSA() into the square-root, it works correctly. RE: Q: Units - Dirk. - 09-13-2016 10:37 AM
... well, as can be shown using "Get from home"/Get from CAS, it is simply a bug of the CAS. It does not process the root and gives a wrong result. |