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Energie, die bei Bremsung frei wird: • Maschinenbau-Forum
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Energie, die bei Bremsung frei wird:

Fragen, Antworten und Diskussion zu den Grundlagen der Physik.

Energie, die bei Bremsung frei wird:

Beitragvon lusthansa am Fr 22. Aug 2014, 20:52

Hallo, es geht um folgende Aufgabe:

3. Das Trägheitsmoment des Hauptantriebs einer Werkzeugmaschine beträgt 0,24 kgm^2. a) Berechnen Sie das gleichbleibende Bremsmoment, um den Antrieb innerhalb von 0,8 Sekunden aus der Höchstdrehzahl von 12000 min^-1 auf 2450 min^-1 abzubremsen. Dabei wirkt keine Reibung.

Lösung 300 Nm ... soweit alles klar. Dann rechne ich das um mit Faktor 0,00000027777778 auf kWh, um folgende Frage b) zu beantworten:

Berechnen Sie die Energie in der Einheit kWh, die bei dem Bremsvorgang frei wird. Ich komme auf 0,00008333333... kWh, die Musterlösung will aber 0,05 kWh.

Liegt der Fehler bei mir oder in der Musterlösung?

Gruß, lusthansa
lusthansa
 
Beiträge: 1
Registriert: Fr 22. Aug 2014, 20:47

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