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【正确回答三道就可以给分Question1.Howmanypeoplearetalkingontheircellphonesatthisinstant?Question2.Howlargeamooncanyoujumpoffof?Inotherwords,assumingreasonabledensities,whatistheradiusofthelargestrockyspherefr】
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正确回答三道就可以给分

Question1.Howmanypeoplearetalkingontheircellphonesatthisinstant?

Question2.Howlargeamooncanyoujumpoffof?

Inotherwords,assumingreasonabledensities,whatistheradiusof

thelargestrockyspherefromwhichyoucanreachescapevelocity

byjumping?Estimateyouranswerwithinafactorof10.

Question3.Acceleration

Estimateandcomparetheaccelerationsofa)ajetairplanetaking

off,b)acaracceleratingtohighwayspeed,andc)apersonstarting

onawalk.

Question4.StoptheWorld,IWanttoGetoff

Ifeveryhumanranfor10secondsasfastaspossibletotheeast,

bywhatfractionwouldtheychangetheEarth’sangularvelocity

arounditsaxis(whiletheywererunning)?

Question5.Automobilekineticenergy

Comparethekineticenergyofacardrivingonthehighwaywith

thechemicalenergyrequiredtokeepdrivingforoneminuteandfor

onehour.Whatfractionofthechemicalenergyis‘lost’tofriction

andairresistance(i.e.,tothermalenergy)?Useanenergydensity

forgasolineof3107J/L.

1

Question6.NeutronStars

TheSunrotatesonitsaxisoncepermonth.IftheSunshrinksand

becomesaneutronstar,bywhatfactorwillitsrotationalinertia

change?Whatwillitsnewperiodofrotationbe?(Note:the

densityoftheSuntodayisapproximately103kg/m3.)

Question7.SolarMassLossandOrbits

AstheSunconvertshydrogentoheliumthroughnuclearfusion,it

emitsenergy.ThisdecreasesthemassoftheSunandchangesthe

orbitsofalltheplanets.HowmuchlighterwilltheSunbewhen

itcompletesthehydrogenburningphase?Byhowmuchwillthis

changetheorbitoftheEarth?Giveyouranswersinnumbersand

inpercent.

Question8.DriftingContinentMomentum

Whatisthemomentumofadriftingcontinent?(Estimatethis

inthereferenceframeoftheEarth;i.e.,ignoretherotationaland

translationalmotionoftheEarth.)Howdoesthiscomparetoa

supertankeroraircraftcarrie

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  I'mProfessorGuWeiHuafromSJTUJI.Itisnotallowedtosearchforanswersontheinternet.It'sagainsttheHonorCodeandIwillfindyouandpunishyou.
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《【正确回答三道就可以给分Question1.Howmanypeoplearetalkingontheircellphonesatthisinstant?Question2.Howlargeamooncanyoujumpoffof?Inotherwords,assumingreasonabledensities,whatistheradiusofthelargestrockyspherefr】|小学英语问答-字典翻译问答网》
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