大一物理题.Auniformsteelrodoflength1.20mandmassof6.40kghasattachedtoeachendasmallballofmass1.06kg.Therodisconstrainedtorotateinahorizontalplaneaboutaverticalaxisthroughitsmidpoint.Atacertaininstantitis
大一物理题.
Auniformsteelrodoflength1.20mandmassof6.40kghasattachedtoeachendasmallballofmass
1.06kg.Therodisconstrainedtorotateinahorizontalplaneaboutaverticalaxisthroughitsmidpoint.
Atacertaininstantitisobservedtoberotatingwithanangularspeedof39.0rev/s.Becauseofaxle
frictionitcomestorest32.0slater.Assumeaconstantfrictionaltorque.
(a)Findtheangularacceleration.
(b)Calculatetheretardingtorqueexertedbyaxlefriction.
(c)Determinethetotalworkdonebytheaxlefriction.
(d)Calculatethenumberofrevolutionsexecutedduringthe32.0s.
(e)Nowsupposethatthefrictionaltorqueisknownnottobeconstant.which,ifany,ofthequantitiesabcdordcanstillbecomputedwithoutrequiringanyadditionalinformation?ifanyexistsgiveitsvalue