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# 物理問題...有關火箭 急!!!

A rocket traveling 1850 m/s away from the Earth at an altitude of

6400 km fires its rockets, which eject gas at a speed of 1300m/s(

relative to rocket). If the mass of the rocket at this moment is 25,000

kg and an acceleration of 1.5 m/s² is desired, at what rate must the

gases be ejected?

Ans: -76 m/s

解好久就是算不出來...請高手告訴我這題到底要怎麼解??

萬分感謝!

一火箭以1850 m/s的速度離開地球達6400 km 的高度

排放之廢氣相對於火箭的速度為1300m/s

若火箭此時之重量為25000kg且加速度為1.5 m/s²

求每秒排放多少廢氣?

重翻最後一句:求廢氣被排出之速度

### 3 Answers

- 1 decade agoFavorite Answer
物理問題...有關火箭 急!!!

A rocket traveling 1850 m/s away from the Earth at an altitude of

6400 km fires its rockets, which eject gas at a speed of 1300m/s(

relative to rocket). If the mass of the rocket at this moment is 25,000

kg and an acceleration of 1.5 m/s² is desired, at what rate must the

gases be ejected?

Ans: -76 m/s

你可以先把題目翻譯成中文媽??? 英文太爛了 但物理不錯強

2008-10-14 16:44:48 補充：

你整個題目單位跟答案的都不一樣

Source(s): 自己 - 1 decade ago
The answer is from our text book.

Physics for Scientists and Engineers, 4th ed. (2008)

author： D. C. Giancoli

publisher：Pearson

The question you ask is also my problem.

BY Ying

- lao_tsengLv 41 decade ago
Your listed answer is of unit in speed (m/s).

Gas exhaust rate shall be of unit in mass per time.

Please check it.