火星地球轨道运动遵循三定律e1 chmc.pdfVIP

E1_ch03_MC_e

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FTheorbitalmotionofMars,theEarthandtheMoonfollowsKepler’sthirdlaw

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T=kr,wherekisaconstant,Tistheperiodoftheorbitalmotionandristhe

semimajoraxisoftheorbit.Whichofthefollowingstatementsconcerningthe

constantkiscorrect?

Akdoesnotcarryanyunit.

BThevalueofkisnotaffectedbythechoiceofunitsforTandr.

CThevalueofkisthesamefortheorbitalmotionsoftheEarthandthe

Moon.

DThevalueofkisthesamefortheorbitalmotionsoftheEarthandMars.

D

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FThefigurebelowshowsaplanetorbitingaroundastarinanellipse.

Whichofthefollowingenergiesoftheplanetis/aregreateratPthanatQ?

(1)Kineticenergy

(2)Gravitationalpotentialenergy

(3)Totalmechanicalenergy

A(1)only

B(2)only

C(3)only

D(1),(2)and(3)

A

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FThefigurebelowshowsaplanetorbitingaroundastarinanellipse.

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E1_ch03_MC_e

Whichofthefollowingstatementsis/arecorrect?

(1)ThespeedoftheplanetatPishigherthanthatatQ.

(2)Themagnitudeofthegravitationalforceactingontheplanetbythestaris

thesamewhentheplanetisatPandQ.

(3)Thetotalmechanicalenergyoftheplanetisthesamewhentheplanetisat

PandQ.

A(1)only

B(2)only

C(1)and(