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Gaokao Physics Practice Question

一人造地球卫星绕地球做匀速圆周运动, 假如该卫星变轨后仍做匀速圆周运动, 动能减小为原来的 $\frac{1}{4}$, 不考虑卫星质量的变化, 则变轨前后卫星的( )

  1. A.向心加速度大小之比为 $4: 1$
  2. B.角速度大小之比为 $2: 1$
  3. C.周期之比为 $1: 8$
  4. D.轨道半径之比为 1: 2

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