A rocket at rest in space, where there is virtually no gravitational force, has a mass of 2.55 * 105 kg, of which 1.81*105 kg is fuel.The engine consumes fuel at the rate of 480 kg/s and the xhaust speed is 3.27 m/s. The engine is fired for 250 s.
- Find the thrust of the rocket engine?
[*]What is the mass of the rocket after the engine burn?
[*]What is the final speed attained?
Eq 1: Vf = Vi + Uexln |Mi/Mf|
The Attempt at a Solution
I think I know the first ine
Thrust = RUex
2 and 3 confuses me
Are they asking about Mass final? Shouldnt I find Vf first?
Mass Initial - 2.55E5
Mass Final after the fuel burns = 7.4E4
The answer for 2 is 1.35 E5 kg, 3 is 2.08E3 m/s
Thank you so much! :D