do research to find out how relative velocity is related to the direction in which rockets are launched to send them into space.Explain the benefits(to society and/ or the environment) of using a specific direction for launching rockets.
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/29 00:46:37
do research to find out how relative velocity is related to the direction in which rockets are launched to send them into space.Explain the benefits(to society and/ or the environment) of using a specific direction for launching rockets.
高管海底 说的对, 在此我做下补充! 将卫星送到某一高度的轨道.卫星必须具有一定的速度,在这一高度卫星受到的万有引力提供向心力.速度达到一定值, 使得万有引力刚好提供向心力这样就能 持续的围绕地球运动下去. 而这一速度 是很惊人的,很大 的速度. 理想值是7.9km/s,指的是贴近地球表面飞行, 这是不可能的. 实际的卫星速度都小于这个速度, 而考试的时候考的是739km/s.同学必须搞清楚这个知识点的含义!请多做练习题 慢慢总结! 所谓坐地日行三万里.地球自转也有线速度. 所以发射卫星时,人类尽量利用这个线速度 来帮助卫星获得第一宇宙速度7.9km/s, 所以尽量在低纬度地区. 即赤道附近发射. 而 我过 由于地理条件,军事局限所以在海南地区没有发射基地.
题目意思是问:研究火箭以怎样的相对速度方向发射将他们送入太空,解释使用特定的方向发射火箭的好处 。
回答:发射速度方向跟地球自转方向相同
Do some research to find an academic program that you would be interested in.
We need to do marketing research是什么意思
members doing research need to find information about.为什么用doing research
find it +adj to do
find it difficult to do,
do research to find out how relative velocity is related to the direction in which rockets are launched to send them into space.Explain the benefits(to society and/ or the environment) of using a specific direction for launching rockets.
是find sb. do还是find sb. to do
They have no money to do ___(far) research
research reputation They have a good research reputation but they find it difficult to commercialize their products.have a good research reputation
接下来怎么做阿,find to do还是find doing
find doing 和find to do 有什么区别?
英译汉,Put into an old Chinese proverb,it means one will never find it difficult to do anythPut into an old Chinese proverb,it means one will never find it difficult to do anything until one has experiences it.The research work is being done by a
I do not find nothing,not to find something II do not find nothing,not to find something I
find的用法,是find sb to do sth 还是find sb do sth
find it adj. to do sth.是什么意思
find+it+形容词+to do sth
what do dolphins use to find things?
find it hard to do 同义词