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2026届江西省重点中学协作体物理试卷:选择题第7题引入数学问题

  • 2026-03-29 01:12:30
2026届江西省重点中学协作体物理试卷:选择题第7题引入数学问题

天体运动中，难得一见的:“物理与数学”紧密结合题型。

解析答案：
本题引入数学的对数函数
y=㏒ₐx或y=lgx。
由公式
GMm/r²=mw²r，则
w²=GM/r³
变为对数函数
2Igw=|gGM-3lgr
即Igw=1/2IgGM-3/2Igr
相当于一次函数
y=kx+b，倾斜向下。
通过分析可知，答案选D项。

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  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.002677s ]
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  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001658s ]
  6. SELECT * FROM `set` [ RunTime:0.001463s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.002350s ]
  8. SELECT * FROM `article` WHERE `id` = 470424 LIMIT 1 [ RunTime:0.001679s ]
  9. UPDATE `article` SET `lasttime` = 1774856495 WHERE `id` = 470424 [ RunTime:0.010699s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000673s ]
  11. SELECT * FROM `article` WHERE `id` < 470424 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001347s ]
  12. SELECT * FROM `article` WHERE `id` > 470424 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003074s ]
  13. SELECT * FROM `article` WHERE `id` < 470424 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001895s ]
  14. SELECT * FROM `article` WHERE `id` < 470424 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005859s ]
  15. SELECT * FROM `article` WHERE `id` < 470424 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001705s ]
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