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热点4 万有引力与航天_4.2025物理总复习_赠品通用版(老高考)复习资料_二轮复习_2023年高考物理二轮复习讲义+课件(全国版)_2023年高考物理二轮复习讲义(全国版)_考前特训

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热点4 万有引力与航天_4.2025物理总复习_赠品通用版(老高考)复习资料_二轮复习_2023年高考物理二轮复习讲义+课件(全国版)_2023年高考物理二轮复习讲义(全国版)_考前特训
热点4 万有引力与航天_4.2025物理总复习_赠品通用版(老高考)复习资料_二轮复习_2023年高考物理二轮复习讲义+课件(全国版)_2023年高考物理二轮复习讲义(全国版)_考前特训
热点4 万有引力与航天_4.2025物理总复习_赠品通用版(老高考)复习资料_二轮复习_2023年高考物理二轮复习讲义+课件(全国版)_2023年高考物理二轮复习讲义(全国版)_考前特训
热点4 万有引力与航天_4.2025物理总复习_赠品通用版(老高考)复习资料_二轮复习_2023年高考物理二轮复习讲义+课件(全国版)_2023年高考物理二轮复习讲义(全国版)_考前特训

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热点 4 万有引力与航天 1.(2022·广东卷·2)“祝融号”火星车需要“休眠”以度过火星寒冷的冬季.假设火星和地 球的冬季是各自公转周期的四分之一,且火星的冬季时长约为地球的 1.88倍.火星和地球 绕太阳的公转均可视为匀速圆周运动.下列关于火星、地球公转的说法正确的是( ) A.火星公转的线速度比地球的大 B.火星公转的角速度比地球的大 C.火星公转的半径比地球的小 D.火星公转的加速度比地球的小 答案 D 解析 由题意可知,火星的公转周期大于地球的公转周期,根据G=mr,可得T=2π,可知 火星的公转半径大于地球的公转半径,故C错误;根据G=m,可得v=,结合C选项解析, 可知火星公转的线速度小于地球公转的线速度,故A错误;根据ω=可知火星公转的角速 度小于地球公转的角速度,故B错误;根据G=ma,可得a=,可知火星公转的加速度小于 地球公转的加速度,故D正确. 2.(多选)(2022·湖南卷·8)如图,火星与地球近似在同一平面内,绕太阳沿同一方向做匀速圆 周运动,火星的轨道半径大约是地球的 1.5倍.地球上的观测者在大多数的时间内观测到火 星相对于恒星背景由西向东运动,称为顺行;有时观测到火星由东向西运动,称为逆行.当 火星、地球、太阳三者在同一直线上,且太阳和火星位于地球两侧时,称为火星冲日.忽略 地球自转,只考虑太阳对行星的引力,下列说法正确的是( ) A.火星的公转周期大约是地球的倍 B.在冲日处,地球上的观测者观测到火星的运动为顺行 C.在冲日处,地球上的观测者观测到火星的运动为逆行 D.在冲日处,火星相对于地球的速度最小 答案 CD 解析 由题意根据开普勒第三定律可知=,由于火星轨道半径大约是地球轨道半径的 1.5倍, 则可得T =T ,故A错误; 火 地 根据G=m,可得v=,由于火星轨道半径大于地球轨道半径,故火星运行的线速度小于地 球运行的线速度,所以在冲日处火星相对于地球由东向西运动,为逆行,故B错误,C正确;由于火星和地球运动的线速度大小不变,在冲日处火星和地球速度方向相同,故相对速度最 小,故D正确. 3.(2022·江苏省苏锡常镇四市调研)北斗指路,国之夙愿.2020年我国发射了北斗系统最后一 颗卫星,从此北斗卫星导航系统实现全球覆盖.如图所示是北斗导航系统中部分卫星的轨道 示意图,已知P、Q、M三颗卫星均做匀速圆周运动,虚线圆是 P、Q卫星轨道的包围圆, 其中P是地球同步卫星,则这三颗卫星( ) A.运行的周期T =T >T P Q M B.线速度大小v F =F M P Q D.具有的机械能E =E >E P Q M 答案 A 解析 根据G=m=mr,可得v=,T=2π ,因为r =r >r ,则运行的周期T =T >T ,线 P Q M P Q M 速度大小v =v B 答案 D 解析 空间站绕地球做匀速圆周运动时,万有引力提供向心力,有 G=ma,在地面的物体, 有G=m′g,因为空间站在圆轨道Ⅱ上时轨道半径大于地球半径,故向心加速度小于g,A 错误;由万有引力表达式可知飞船和空间站在 A处所受的万有引力还与飞船和空间站的质 量有关,因为题目中不知道二者质量的关系,故无法判断二者在 A处所受万有引力是否相 等,B错误;飞船沿轨道Ⅰ运动时只有引力做功,故机械能守恒,C错误;空间站在轨道Ⅱ 绕地球做匀速圆周运动时,万有引力提供向心力,有G=,又因为G=mg,故空间站线速度大小为v==,因飞船运动的轨道Ⅰ为椭圆轨道,故飞船在B点的速度大于第一宇宙速度, 而空间站的速度小于第一宇宙速度,故v >,D正确. B
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  1. CONNECT:[ UseTime:0.000866s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001581s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.005031s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.002041s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001376s ]
  6. SELECT * FROM `set` [ RunTime:0.000609s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001665s ]
  8. SELECT * FROM `wendang` WHERE `id` = 372525 LIMIT 1 [ RunTime:0.001108s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 372525 [ RunTime:0.004718s ]
  10. UPDATE `wendang` SET `lasttime` = 1773109039 WHERE `id` = 372525 [ RunTime:0.001263s ]
  11. SELECT * FROM `wendang` WHERE `id` < 372525 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001123s ]
  12. SELECT * FROM `wendang` WHERE `id` > 372525 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.006195s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 372525 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002455s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 372525 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002114s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 372525 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005501s ]
0.177643s