Re: Simple question about a laser pushing a proton.


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Spaceman wrote:
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Spaceman wrote:

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Wrong.
The expulsion mass times the expulsion speed is the main factor.


Do you really think a rocket can move faster than
the stuff it is pushing out?
That is kinda silly.
That is like a car moving faster than you can push it
all on it's own. (without going downhill of course.)

I want you to try a calculation, because it might help things make more
sense.
Let's pretend I'm sitting on my slightly rotund bottom in the middle of
a frozen lake, just hanging out with my favorite 180 kilo boulder. I
get startled by a passing car, and throw my boulder at 0.5 m/s towards
the sound.
Since I have a mass of 90 kilos, how fast do I slide backwards on the
ice after throwing the boulder?
Would the answer be *any* different if I throw 180 kilos worth of small
boulders very quickly rather than one huge one?


You have a problem you do not see there,
You are the energy, you are moving the rock and it,
in turn is fightin your motion.
The rock is the rocket. you are the fuel.
you (the fuel) moved faster than the rock.
Just like I stated.

You're missing the fact that the two situations are entirely the same. A
rocket is "throwing" out its exhaust at a particular velocity.


No,
I am not missing any facts about what you stated,
In fact you are missing the fact that you were the fuel
in that example and the rock was the rocket you were
propelling.
Are you saying the rock threw you and you did nothing?

Did you actually *try* to do the math? Do you know how to derive the
velocity of a rocket as a function of fuel burned?

Will you ever answer...
How can an object move faster than it is pushed?


It was right there in the link I gave you. The final speed of a Saturn V
rocket is *THREE TIMES* the speed of the exhaust.

According to math only and no physical measurements
of the actual exaust ever taken so no physical proof at all.
too bad you can not grasp that reality.
For some reason you think math play is a physical proof.
LOL

Again,
How does something move faster than the object that
is pushing it.
Why do you keep ignoring that question?





.

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