高考物理总复习能力课 天体运动中常考易错的“两个命题点”
能力课 天体运动中常考易错的“两个命题点”选择题(1~9题为单项选择题,10~14题为多项选择题)1.如图1所示,a是地球赤道上的一点,t=0时刻在a的正上空有b、c、d三颗轨道均位于赤道平面的地球卫星,这些卫星绕地球做匀速圆周运动的运行方向均与地球自转方向(顺时针方向)相同,其中c是地球同步卫星。设卫星b绕地球运行的周期为T,则在t=T时刻这些卫星相对a的位置最接近实际的是( )图1解析 a是地球赤道上的一点,c是地球同步卫星,则c始终在a的正上方;由G=mr,得T=,故r越大,T越大,则b比d超前。答案 C2.某卫星在半径为r的轨道1上做圆周运动,动能为Ek,变轨到轨道2上后,动能比在轨...
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