55. In our system, we have m1= m2= M(the mass of our Sun, 1.99 ×1030kg). With r= 2r1in this system (so r1is one-half the Earth-to-Sun distance r), and v = πr/Tfor the speed, we have ()22312122.2rTGm mrmTrrGM=¡=With r= 1.5 ×1011m, we obtain
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