Question

Timer |-]Notes à Evaluate a Feedback-Print 61nfo Course Contents » » Rocket Leaving Solar System Alt Version Due this Friday, Oct 12 at 08:15 am (EDT) A rocket is moving away from the solar system at a speed of 5.20x103 m/s. It fires its engine, which ejects exhaust with a velocity of 2.80x103 m/s relative to the rocket. The mass of the rocket at this time is 4.20x104 kg, and it experiences an acceleration of 3.20 m/s2. What is the thrust of the engine? Calculate this simply from F ma, using the mass given. 2400 m/s Submit Answer Incompatible units. No conversion found between "n/ and the ries 0/10 Tries Prevlous required units. At what rate, in killograms per second was the exhaust ejected during the firing? This can be solved by using the alternative form of Newton's 2nd Law With Momentum which is actually Prac found first in section 9.2 as Eq. 9.9, F-dp/dt--> this last section 9.7 focuses on this since this is how rocket engines work: by "ejecting" negative momentum (in order to gain positive momentum ie to accelerate le creating a force F). That formula in this case becomes, since the velocity is constant but the mass is NOT constant (usually it's the other way around for momentum changes, the mass stays the same) the equation becomes F d(mv)/dtv"dm/dt. Thus with F and v you can solve for the requested A See answer, which is actually just this dm/dt quantity- ie dm/dtF/v. Submit Answer Incorrect. Tries 2/10 Previous Tres Questis This discussion is closed. Send Feedbacka A rocket during the 8 4 6

Answer 1