作业2-1

简答题（简单两句话回答）

1．对于托勒密的“本轮均轮”学说，请在下列词汇中任选两个，以表达给你留下的深刻印象，并简述理由。（迷信、荒谬、繁琐、顽固、精妙、执着、智慧、创举）

2．有一首宋诗：“飞花两岸照船红，百里榆堤半日风。卧看满天云不动，不知云与我俱东。”试用伽利略参照系的概念分析之。

3．开普勒定律与万有引力定律有什么关系?

4．Why does Aristotle look so sad since Galileo analyzed a ball

rolling on inclined planes?

计算题：

1．请用万有引力定律，借鉴使用2.1.6式，证明同步地球卫星（围绕地球转一圈时间为24小时）的轨道高度为36000公里，与卫星质量无关。

4. When we say the universe is flat, we mean:

A. The angles inside a triangle add to 180°

B. Parallel lines remain parallel forever

C. Space is infinite in extent

D. All of the above

1. If identical forces act on two objects, where object A is twice as massive as object B, how do their accelerations compare?

A. same accelerations

B. A accelerates twice as much as B

C. B accelerates twice as much as A

D. A and B accelerate in different directions force

Why does Aristotle look so sad? Is it because he’s realized that his entire system of physics is wrong?