Important Questions on Rocket Science

Learning Goal: I’m working on a rocket science question and need an explanation and answer to help me learn.

1) In a gravity-free, drag-free environment, what is the nature of the trajectory of rockets?

2) In an ideal chemical rocket engine, which among the following is not a feature of the combustion chamber?

3) What will be the estimated amount of energy loss due to the transfer of heat to the walls of the rocket for a typical real rocket engine?

4) The effective propellant fraction can be reduced by which of the following factors?

5)For single-stage vehicles, gravitation free and drag-free space flight, what should be the practical value of the mass ratio that is (Initial mass/inert mass)?