Umdrehungszahl berechnen

<script language="javascript" type="text/javascript"><!-- [et_pb_line_break_holder] --><!-- [et_pb_line_break_holder] -->function round(wert, dez) {<!-- [et_pb_line_break_holder] --> wert = parseFloat(wert);<!-- [et_pb_line_break_holder] --> if (!wert) return 0;<!-- [et_pb_line_break_holder] --> dez = parseInt(dez);<!-- [et_pb_line_break_holder] --> if (!dez) dez=0;<!-- [et_pb_line_break_holder] --> var umrechnungsfaktor = Math.pow(10,dez);<!-- [et_pb_line_break_holder] --> return Math.round(wert * umrechnungsfaktor) / umrechnungsfaktor;<!-- [et_pb_line_break_holder] -->} <!-- [et_pb_line_break_holder] --><!-- [et_pb_line_break_holder] -->function reset() {<!-- [et_pb_line_break_holder] -->document.rechner.cm.value = "";<!-- [et_pb_line_break_holder] -->document.rechner.gee.value="";<!-- [et_pb_line_break_holder] -->document.rechner.ergebnis.value="";<!-- [et_pb_line_break_holder] -->}<!-- [et_pb_line_break_holder] --><!-- [et_pb_line_break_holder] -->function go()<!-- [et_pb_line_break_holder] -->{<!-- [et_pb_line_break_holder] --> var cm0 = document.rechner.cm.value;<!-- [et_pb_line_break_holder] --> var gee0 = document.rechner.gee.value;<!-- [et_pb_line_break_holder] --><!-- [et_pb_line_break_holder] --> if ( (cm0.trim()=="") || (gee0.trim()=="") ) {<!-- [et_pb_line_break_holder] --> alert("Überprüfen Sie Ihre Eingaben und versuchen Sie es erneut.");<!-- [et_pb_line_break_holder] --> return;<!-- [et_pb_line_break_holder] --> }<!-- [et_pb_line_break_holder] --><!-- [et_pb_line_break_holder] --> calc_rpm(cm0, gee0);<!-- [et_pb_line_break_holder] -->}<!-- [et_pb_line_break_holder] --><!-- [et_pb_line_break_holder] -->function calc_rpm(cm, gee) <!-- [et_pb_line_break_holder] -->{<!-- [et_pb_line_break_holder] --><!-- [et_pb_line_break_holder] -->cm = cm.replace(",",".");<!-- [et_pb_line_break_holder] -->cm = parseFloat(Number(cm));<!-- [et_pb_line_break_holder] --><!-- [et_pb_line_break_holder] -->gee = gee.replace(",",".");<!-- [et_pb_line_break_holder] -->gee = parseFloat(Number(gee));<!-- [et_pb_line_break_holder] --><!-- [et_pb_line_break_holder] -->ergebnis = 1000 * Math.pow(( gee / ( 11.17 * cm )), 0.5);<!-- [et_pb_line_break_holder] -->document.rechner.ergebnis.value = round(ergebnis, 0);<!-- [et_pb_line_break_holder] --><!-- [et_pb_line_break_holder] -->}<!-- [et_pb_line_break_holder] --><!-- [et_pb_line_break_holder] --></script>

Für die Umrechnung der relativen Zentrifugalkraft in Umdrehungen pro Minuten können Sie das folgende Programm verwenden.

Die Berechnung erfolgt mit der Formel: Umdrehungszahl = 1000*({„g“-Kraft}/(11.17*{Radius}))^(0.5)

<form name="rechner"><!-- [et_pb_line_break_holder] --><table><!-- [et_pb_line_break_holder] --><tbody><!-- [et_pb_line_break_holder] --><tr><!-- [et_pb_line_break_holder] --><td>Relative Zentrifugalkraft</td><!-- [et_pb_line_break_holder] --><td><input name="gee" type="text"> x g</td><!-- [et_pb_line_break_holder] --></tr><!-- [et_pb_line_break_holder] --><tr><!-- [et_pb_line_break_holder] --><td>Radius</td><!-- [et_pb_line_break_holder] --><td><input name="cm" type="text"> in Zentimeter (cm)</td><!-- [et_pb_line_break_holder] --></tr><!-- [et_pb_line_break_holder] --><tr><!-- [et_pb_line_break_holder] --><td colspan="2"><input onclick="go()" style="background: #0058a2; color: white;" value="Berechnung" type="button"> <input onclick="reset()" style="background: #c4104a; color: white;" value="Zurücksetzen" type="button"></td><!-- [et_pb_line_break_holder] --></tr><!-- [et_pb_line_break_holder] --></tbody><!-- [et_pb_line_break_holder] --></table><!-- [et_pb_line_break_holder] --> <!-- [et_pb_line_break_holder] --><table><!-- [et_pb_line_break_holder] --><tbody><!-- [et_pb_line_break_holder] --><tr><!-- [et_pb_line_break_holder] --><td><!-- [et_pb_line_break_holder] --><h4>Ergebnis</h4><!-- [et_pb_line_break_holder] --></td><!-- [et_pb_line_break_holder] --></tr><!-- [et_pb_line_break_holder] --><tr><!-- [et_pb_line_break_holder] --><td>Rounds Per Minute (RPM)</td><!-- [et_pb_line_break_holder] --><td><input style="color: #333333; border: 1px solid #333333; font-size: 15px;" name="ergebnis" type="text"> rpm</td><!-- [et_pb_line_break_holder] --></tr><!-- [et_pb_line_break_holder] --></tbody><!-- [et_pb_line_break_holder] --></table><!-- [et_pb_line_break_holder] --></form>

Quelle:
Mathematik im Labor – Ein Arbeitsbuch für Molekularbiologie und Biotechnologie. Frank H. Stephenson im Spektum Verlag, 1. Auflage. 2005.