And the Gibberish continues...
Everything turns into a farce with you, don't it, time-wasting luckypoodle?
Get back in your clown-kennel & get used to being ignored again.
Now; let's return to the post full of awkward questions that you are still desperately trying to shitpost down the memory-hole:
LOL!! How does nothing (a vacuum) enter something (a combustion)?
LOL!!! How do you get a gas to combust in a vacuum?
So how does the gas accelerate from zero to speed of free expansion if no work is done?
Through converting its pressure potential energy into molecular kinetic energy; thus, no 'force' is applied to the gas & no work is done, as the gas is expanding freely into a vacuum without meeting resistance.
But apparently you can get nothing to go into something.
This doesn't mean anything; typical markjo.
As for your silly J2 engine; by all means let us examine its 'combustion chamber', nozzle, etc...
It is a joke.
Just like your entire shitpost.
Also, I notice rab downunder is still avoiding addressing this blatant troll-post:
Object A is the Rocket + unburnt fuel, Object F is the burning fuel, and Object B is the thousands of pounds of fuel being ejected out the back.
Note that he is trying to tell us that Objects F & B are the exact same thing.
Here's a hint for you, rab: One, Two, Three.
Remember that!
Not One, Two, Two...
But One, Two,
Three.I believe there is a puppet vampire called Count Von Count on Sesame Street who may be able to help you further should you require it?
Lastly, note that sokarul is avoiding addressing this important point:
No. Why does it need to expand?
Because you said this:
The ball is the fuel/oxidizer exhaust.
Whilst markjo said this:
the expanding (burning) propellant is ONE object using stored energy to create a force by expanding against a SECOND object, i.e. the combustion chamber.
So, if the ball is NOT expanding, then your whole analogy FAILS.
Running away from the ludicrous contradictions at the heart of your arguments is quite the habit with you shpayze-trolls isn't it?