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Gaokao Physics Practice Question

已知地球的质量约为火星质量的 10 倍, 地球的半径约为火星半径的 2 倍, 则航 天器在火星表面附近绕火星做匀速圆周运动的速率约为

  1. A.$3.5 \mathrm{~km} / \mathrm{s}$
  2. B.$5.0 \mathrm{~km} / \mathrm{s}$
  3. C.$17.7 \mathrm{~km} / \mathrm{s}$
  4. D.$35.2 \mathrm{~km} / \mathrm{s}$

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