John Taylor Classical Mechanics Chapter 3, Problem 7

  • #1
John Taylor "Classical Mechanics" Chapter 3, Problem 7

1. Homework Statement [/b]
The first couple of minutes of the launch of a space shuttle can be described very roughly as follows: The initial mass is 2x10^6kg, the final mass (after 2 min) is about 1x10^6 kg, the average exhaust speed is about 3000 m/s and the initial velocity is 0. If all this were taking place in outer space, with negligible gravity, what would be the shuttle speed at the end of this stage? What is the thrust during the same period and how does it compare with the initial total weight of the shuttle (on earth)?
I already answered the first question, and got 2079.4 m/s


Homework Equations


mdv/dt=(-dm/dt)v>ex


The Attempt at a Solution


Am not able to get dv/dt.
 

Answers and Replies

  • #2
199
15
you know ##\frac{dm}{dt}##, ##v_{ex}##. Thrust is the reactionary force. Solve R.H.S.
 

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