Big history (3)

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1、Bighistory(3)StarsOutlineTheformingofgalaxiesTheLifecycleofstarsTherotationofrigidbodySolarsystemTheformingofuniversestructureJamesJeans(1877–1946).ThecauseofuniversestructureGravitationalinstabilityturbulenceEllipticalgalaxySpiralgalaxyNuclearfusionWhitedwarfandneutronstarAngu

2、larmomentumTheangularmomentumofaparticlerespecttoonepointTherotationalinertiaDefinitionAcontinuousbody:themomentofinertiaofonerigidbodyisdeterminedbyitsshape,thepositionoftheaxisandthedensitydistributionThemomentofinertiaofrodwithitsmassdistributeduniformlyandaperpendicularaxis

3、throughoneofitsends(itslengthl)oxzdxdmxSolution:AngularmomentumofonerigidbodyzdTorque（力矩）Intheplanethatisperpendiculartotheaxis,wedefinetorqueasthecrossproductofthepositionvectorandthenormalcomponentoftheforcerespecttotheaxismizNewton’ssecondlawforrotation（转动定律）:Theconservati

4、onlawofangularmomentumTheangularmomentumisaconstant,providedthenettorqueontherigidbodyiszero.ThesolarsystemTheLifeofsun