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1.D“嫦娥二号”地月转移轨道可以看作椭圆轨道一部分(一半),椭圆轨道半长轴a=(r_1)/2,设“嫦娥二号”椭圆轨道运行一周的时间(周期)为T,已知月球绕地球运行周期T_1=29.5天,公转轨道半径r_1=38万公里.由开普勒定律可知,(T~2)/(R~3)=k=恒量,所以(T~2)/(a~3)=(T~2_1)/(r~3_1),代入数据得:T=T_1((a/(r_1))~3)~(1/2)=29.5((1/2)~3)~(1/2)天≈10天.“嫦娥二号”在地月转移轨道最接近其运行时间
1.D “Chang'e II” earth orbit transfer track can be seen as part of the elliptical orbit (half), elliptical orbit semi-major axis a = (r_1) / 2, set up “Chang'e II” elliptical orbit week The time (period) is T, and it is known that the lunar orbiting period T_1 = 29.5 days and the orbiting radius r_1 = 380,000 km. According to Kepler's law, (T 2) / (R 3) = k = (T / 2) / (a ~ 3) = (T ~ 2_1) / (r ~ 3_1), substituting the data into: T = T_1 (a / r_1) ~ 3) = 29.5 ((1/2) ~ 3) ~ (1/2) days ≈10 days. “Chang'e II” in the ground orbit transfer orbit closest to its running time