天文工作者观测某行星的半径为R1,自转周期为T1,它有一颗卫星,轨道半径为R2,

题型:问答题

问题:

天文工作者观测某行星的半径为R1,自转周期为T1,它有一颗卫星,轨道半径为R2,绕行星公转周期为T2

则(1)该行星的平均密度为多大?

(2)要在此行星的赤道上发射一颗同步人造卫星,使其轨道在赤道上方,则该人造卫星的轨道半径为多大?

考点:人造地球卫星万有引力定律的其他应用
题型:问答题
(-
2
)×2
7
-
10
(保留三个有效数字).
题型:问答题

任务型阅读。

    It is Saturday. It is raining heavily outside. It is cloudy and humid. Neil's have

to stay at home. Neil's doing my homework. His sister is watching TV. She loves Jack and

Jerry. She wants to be an actress when she grows up. He is cooking now. They are going

to have supper. His father is busy with the computer. It was broken when his brother was

playing games yesterday.

1. It is ______ heavily outside.

2. Neil is a ______.

3. Neil's sister wants to be ______.

4. There are ______ people in his family.

5. The ______ was broken when his brother was playing games yesterday.

题型:问答题

常见电路连接方式一般有______和______两种,生活中小彩灯的电路就属于______电路,而家庭电路中的各个用电器之间是______的,用电器和控制它们的开关是______的;两种电路中用电器工作特点的主要区别是能不能______(选填“同时”或“单独”)工作,若所有用电器可以同时工作,也可以同时不工作,则电路______(选填“一定”或“不一定”)是并联的.

题型:问答题

印度宗教最大的色彩没有肉欲色彩的内容。

题型:问答题

某校高三(1)班同学为迎接第31个“民族团结月”召开主题班会,盼盼同学认为“维护民族团结对我国经济社会发展具有重要意义。维护民族团结需要全社会的共同努力。”

运用《政治生活》的有关知识,评析盼盼同学的观点。

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