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5.C【命题意图】本题以气态巨行星图绕银河系内的一颗白矮星转动为背景,考查万有引力定律、圆周运动,意在考查考生的推理论证能力。Mm 4【解析】万有引力提供向心力,由G之=mr得T2√低,所以气态百行星与地球的公转周期之比宁1428Ma“,代入数据解得T行=5√兮7,由题给数据无MGMm法计算气态巨行屋的自转周期,A错误;由之=ma得a学,所以气态巨行星与地球的加速度之比。GMMaM?,代人数据解得=25a。392,B错误;GMm2CM得=所以气态巨行星与地球公转的速率之比Ma5地”√8,在相同时间内两,代入数据解得。者的路程之比也为58C正确:由于气态巨行星与地球的质量关系未知,所以无法求出两者的动能之比,D错误
One possible versionDear HenryHow are things going? On April lst, we finally resumed classes after the outbreak ofcoronavirusOur class organized a rehearsal to show us hCOVID-19 pandemicFirstly, the head teacher showed us how to wear masks correctly. We followed hiexample, pulled the mask down, pressed it against our nose and squeezed to make sure ittight around our nose and face. Secondly, he also illustrated how to wash hands properly withseven steps. Following his instructions, we washed our hands earnestly with soaps and waterI feel so delighted that we can return to our schoolch a short time, i believe that wewill soon come back to normal school life through our joint effort.