Posted by beavis on Wednesday, February 15, 2012 at 5:01pm.
A rocket has a perignition mass of 1100kgs1 producing a thrust of 10000N. How long after ignition of the fuel will the rocket lift off?
also explain how is it possible for a rocket to accelerate in space.
(i cant work it outt. i know it involves the rocket thrust equation some how, the newtons 2nd law and suvat's..) thank you

physics  drwls, Wednesday, February 15, 2012 at 5:10pm
You must have misspelled and omitted something.
I assume you mean preignition mass, not perignition mass, which makes no sense.
If so, what is the preignition mass? The number you have provided is a mass flow RATE.
The rocket lifts off then the trust equals the weight. Use the initial mass and the mass flow rate to figure out when that happens.

physics  beavis, Wednesday, February 15, 2012 at 5:18pm
i haveeee!! ive posted the right question again please look it up again if you have time :(
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