宇航员驾驶一飞船在靠近某行星表面附近的圆形轨道上运行，已知飞

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问题论证题

宇航员驾驶一飞船在靠近某行星表面附近的圆形轨道上运行，已知飞船运行的周期为T，行星的平均密度为，试证明。（万有引力恒量G为已知，k是恒量）

答案

证明：设行星半径为R、质量为M，飞船在靠近行星表面附近的轨道上运行时，有

即 ①

又行星密度 ②

将①代入②得，证毕

阅读理解

阅读短文，判断正(√)误(×)。

Hi, I'm Li Ming. I am going to have a busy weekend! On Saturday, my father is going to buy some

newspapers. My mother is going to go shopping. I'm going to visit my friend, Mike. On Sunday, my father

is going to read a magazine. My mother is going to watch TV. I'm going to the bookstore. I'm going to buy

some comic books. After that we are going to the cinema.

( ) 1. Li Ming's father is going to buy a dictionary on Saturday.

( ) 2. His mother is going to go shopping on Saturday.

( ) 3. Li Ming is going to visit his friend on Sunday.

( ) 4. His mother is going to watch TV on Sunday.

( ) 5. Li Ming is going to buy some comic books on Sunday.

问答题

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