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NASA Thrust Equation gets destroyed.

 
Anonymous Coward
User ID: 54328591
Canada
03/05/2019 02:52 PM
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Re: NASA Thrust Equation gets destroyed.
A rocket doesn’t blow chunks of itself off. Try again.
 Quoting: Anonymous Coward 54474630


Solid chunks
 Quoting: Anonymous Coward 54474630


How small does a chunk have to be to no longer have mass? Liquid or gas is kind of like a bunch of chunks.
 Quoting: syncro


Solids are not fluids. There are three different states of matter you know
DuckNCover

User ID: 77414829
United States
03/05/2019 03:07 PM

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Re: NASA Thrust Equation gets destroyed.
Im going to destroy the wife tonight with my own thrust equation.
 Quoting: Anonymous Coward 74989850


You will need the Oscillation Overthruster from Adventures of Buckaroo Banzi Across the 8th Dimension...

[link to www.imdb.com (secure)]





Last Edited by DuckNCover on 03/05/2019 03:09 PM
oniongrass

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03/05/2019 03:10 PM
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Re: NASA Thrust Equation gets destroyed.
A rocket doesn’t blow chunks of itself off. Try again.
 Quoting: Anonymous Coward 54474630


Solid chunks
 Quoting: Anonymous Coward 54474630


How small does a chunk have to be to no longer have mass? Liquid or gas is kind of like a bunch of chunks.
 Quoting: syncro


Solids are not fluids. There are three different states of matter you know
 Quoting: Anonymous Coward 54328591


Not sure who's trying to prove what here, but conservation of momentum applies to solids, liquids, gases, plasmas ... every state of matter. Total momentum is conserved unless an external net force is applied. That's why rockets work.
tbonedude

User ID: 20671650
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03/05/2019 03:16 PM
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Re: NASA Thrust Equation gets destroyed.
A rocket doesn’t blow chunks of itself off. Try again.
 Quoting: Anonymous Coward 54474630


Solid chunks
 Quoting: Anonymous Coward 54474630


How small does a chunk have to be to no longer have mass? Liquid or gas is kind of like a bunch of chunks.
 Quoting: syncro


Solids are not fluids. There are three different states of matter you know
 Quoting: Anonymous Coward 54328591


There are five known phases, or states, of matter: solids, liquids, gases, plasma and Bose-Einstein condensates.

Stuffs changed since 40 years ago. Hell its changed since 5 years ago.

Plasma was questioned up to about 100 years ago, but became official in the last 15 or 20 years.
anon
User ID: 30847320
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03/05/2019 03:35 PM
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Re: NASA Thrust Equation gets destroyed.
Why one star? Did you debunk the video? Isn’t the math correct? Clearly the math is correct. NASA is proven mathematically to be liars.
 Quoting: Anonymous Coward 76708078


THE vacuum analogy is flawed.
The external vacuum applies force to the pipe, which is relieved by the vent, which transfers the force to external air, which is then pulled through the pipe.
Close the vent and the pipe collapses.

In a rocket, fuel is burned, creating hot gases which are forced out the rear. The gases exert an equal force in the opposite direction, upon the rocket. [Newton's Third Law]
The internal force applied to the rocket is Thrust.
Applying impulse-momentum theory, derived from Newton's Second Law, the factors that determine thrust can be identified.

This is integration of concepts of Conservation of Linear Momentum and Conservation of Energy.
 Quoting: anon 30847320


Vacuum doesn’t apply a force you idiot. It simply creates a low pressure area and thus a pressure gradient. How the hell is a metal pipe gonna collapse?
 Quoting: Anonymous Coward 76755146


Ok. The pipe TENDS to collapse due to external atmospheric pressure. Happy? The vacuum FORCE is created by the MOTOR of the vacuum that you attached to the pipe. It actually exerts force on the gases within the pipe, but I simplified the explanation for the simple minded. Apparently you still didn't get it. The force on the gases within the pipe is transferred to gases OUTSIDE the pipe.

In a rocket, all the forces are INTERNAL. A force, created by burning the fuel pushes the gas away. The gas pushes back because it has mass.

Not that you, lacking a capacity for abstract concepts,
will be able to understand any of this.
Anonymous Coward
User ID: 58747496
Canada
03/05/2019 04:06 PM
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Re: NASA Thrust Equation gets destroyed.
Why one star? Did you debunk the video? Isn’t the math correct? Clearly the math is correct. NASA is proven mathematically to be liars.
 Quoting: Anonymous Coward 76708078


THE vacuum analogy is flawed.
The external vacuum applies force to the pipe, which is relieved by the vent, which transfers the force to external air, which is then pulled through the pipe.
Close the vent and the pipe collapses.

In a rocket, fuel is burned, creating hot gases which are forced out the rear. The gases exert an equal force in the opposite direction, upon the rocket. [Newton's Third Law]
The internal force applied to the rocket is Thrust.
Applying impulse-momentum theory, derived from Newton's Second Law, the factors that determine thrust can be identified.

This is integration of concepts of Conservation of Linear Momentum and Conservation of Energy.
 Quoting: anon 30847320


Vacuum doesn’t apply a force you idiot. It simply creates a low pressure area and thus a pressure gradient. How the hell is a metal pipe gonna collapse?
 Quoting: Anonymous Coward 76755146



Ok. The pipe TENDS to collapse due to external atmospheric pressure. Happy? The vacuum FORCE is created by the MOTOR of the vacuum that you attached to the pipe. It actually exerts force on the gases within the pipe, but I simplified the explanation for the simple minded. Apparently you still didn't get it. The force on the gases within the pipe is transferred to gases OUTSIDE the pipe.

In a rocket, all the forces are INTERNAL. A force, created by burning the fuel pushes the gas away. The gas pushes back because it has mass.

Not that you, lacking a capacity for abstract concepts,
will be able to understand any of this.
 Quoting: anon 30847320


Can you demonstrate anything that you have said?
Anonymous Coward
User ID: 58747496
Canada
03/05/2019 04:08 PM
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Re: NASA Thrust Equation gets destroyed.
...


Solid chunks
 Quoting: Anonymous Coward 54474630


How small does a chunk have to be to no longer have mass? Liquid or gas is kind of like a bunch of chunks.
 Quoting: syncro


Solids are not fluids. There are three different states of matter you know
 Quoting: Anonymous Coward 54328591


Not sure who's trying to prove what here, but conservation of momentum applies to solids, liquids, gases, plasmas ... every state of matter. Total momentum is conserved unless an external net force is applied. That's why rockets work.
 Quoting: oniongrass


Fluids move due to pressure gradient force. The pressure broke apart the soda can and physically pushed it. If there is nothing to push she. The gas moves to low pressure, there is no opposite force
Anonymous Coward
User ID: 77117761
United States
03/05/2019 06:32 PM
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Re: NASA Thrust Equation gets destroyed.
Oh well glp, despite the evidence you’ll end the fight in the forum. That’s why you let the ruling class walk all over you.

Y’all
Sheep
Anonymous Coward
User ID: 77376498
United States
03/05/2019 07:17 PM
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Re: NASA Thrust Equation gets destroyed.
Why one star? Did you debunk the video? Isn’t the math correct? Clearly the math is correct. NASA is proven mathematically to be liars.
 Quoting: Anonymous Coward 76708078


THE vacuum analogy is flawed.
The external vacuum applies force to the pipe, which is relieved by the vent, which transfers the force to external air, which is then pulled through the pipe.
Close the vent and the pipe collapses.

In a rocket, fuel is burned, creating hot gases which are forced out the rear. The gases exert an equal force in the opposite direction, upon the rocket. [Newton's Third Law]
The internal force applied to the rocket is Thrust.
Applying impulse-momentum theory, derived from Newton's Second Law, the factors that determine thrust can be identified.

This is integration of concepts of Conservation of Linear Momentum and Conservation of Energy.
 Quoting: anon 30847320


Vacuum doesn’t apply a force you idiot. It simply creates a low pressure area and thus a pressure gradient. How the hell is a metal pipe gonna collapse?
 Quoting: Anonymous Coward 76755146


Ok. The pipe TENDS to collapse due to external atmospheric pressure. Happy? The vacuum FORCE is created by the MOTOR of the vacuum that you attached to the pipe. It actually exerts force on the gases within the pipe, but I simplified the explanation for the simple minded. Apparently you still didn't get it. The force on the gases within the pipe is transferred to gases OUTSIDE the pipe.

In a rocket, all the forces are INTERNAL. A force, created by burning the fuel pushes the gas away. The gas pushes back because it has mass.

Not that you, lacking a capacity for abstract concepts,
will be able to understand any of this.
 Quoting: anon 30847320


I'd bereal careful how you throw that "simple minded" term around: the vacuum motor doesn'"transfer the force to the gases outside:"

The atmosperic pressure at sea level is 14.7lb/sq in. the vacuum motor( fan) creates a lower pressure by moving the air (bernoulis law)(velocity creates lower pressure)and the atmosphere (14.7 lb/sqin.)rushes into fill the "vacuum".

Yes rapidly expanding gases push on the inside of the rocket thrust chamber evenly except over the hole in the thrust chamber( the nozzle). The saturn5 f-1 engines consumed fuel (MASS )at 15 TONS/SECOND EACH.

These threads rank right up there with "flat erf"
Kung Fu Lover

User ID: 76809044
United States
03/05/2019 07:18 PM
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Re: NASA Thrust Equation gets destroyed.
how does the earth's atmosphere stay attached to the surface with no barrier between it and a near perfect vacuum? Gravity does not explain this.
 Quoting: Zetetic Ben

Gravity does explain this.
Air has weight, IOW it falls down.

That would be explained by density and buoyancy inside a fishbowl.
 Quoting: Zetetic Ben

How do those happen without gravity?
Without gravity air has no weight, without weight density would be zero, without density there is no buoyancy.

Gravity is still just a theory.
 Quoting: Zetetic Ben

Gravity is an observed phenomenon.

Not even your god Neil Degrasse Tyson can explain what it is.
 Quoting: Zetetic Ben

Irrelevant, it is an observed phenomenon.
Not understanding how something works doesn't mean it doesn't work.
book
 Quoting: Halcyon Dayz, FCD


we know what it does, we just don't know what it is.
Anonymous Coward
User ID: 76256732
United States
03/05/2019 07:28 PM
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Re: NASA Thrust Equation gets destroyed.
Chemical rocket thrust does not work in the vacuum of space.
Near the Earth, rocket thrust pushes against the atmosphere around the rocket.
In space, rocket thrust pushes against NOTHING.

If Chemical rockets can push against nothing, you should
be able to fly if you pull hard enough on your shoe laces.

No computer or maybe ALL the computers in the world
working together can not resolve a 3 body space problem.

All bodies in the conventionally accepted space model are claimed to be
moving through the universe between 800,000 mph to 2.2 million mph.
No body knows the exact speeds so nobody can calculate the movement
of a third body to go from on moving mass to another moving mass.

I do not KNOW the nature of those lights in the sky.
People through mass indoctrination ASSUME that the lights are
satellites created and launched by man.
 Quoting: Idaho Bullwinkle


Take an unloaded CO2 powered airgun with a full gas cylinder in place and tape it to skateboard. Rig the trigger with servo to be activated by remote control. Fire the gun. What happens to the skateboard? Now do the same experiment with the gun loaded. Notice the difference? By increasing the expelled mass the reaction is greatly enhanced. WHY?
oniongrass

User ID: 77403676
United States
03/05/2019 07:32 PM
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Re: NASA Thrust Equation gets destroyed.
...


How small does a chunk have to be to no longer have mass? Liquid or gas is kind of like a bunch of chunks.
 Quoting: syncro


Solids are not fluids. There are three different states of matter you know
 Quoting: Anonymous Coward 54328591


Not sure who's trying to prove what here, but conservation of momentum applies to solids, liquids, gases, plasmas ... every state of matter. Total momentum is conserved unless an external net force is applied. That's why rockets work.
 Quoting: oniongrass


Fluids move due to pressure gradient force. The pressure broke apart the soda can and physically pushed it. If there is nothing to push she. The gas moves to low pressure, there is no opposite force
 Quoting: Anonymous Coward 58747496


Your problem is that you're thinking of force.

F = ma is what Newton said. So one could conclude that with no external force, there's no acceleration. But he was wrong in the case of masses that change. That conclusion would be wrong.

Actually it's

F = dp/dt = ma + v dm/dt

so with no external force, momentum is conserved. And that's why rockets work. Because of the nonzero v dm/dt term.

Last Edited by oniongrass on 03/05/2019 07:33 PM
Anonymous Coward
User ID: 77431166
United States
03/05/2019 07:34 PM
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Re: NASA Thrust Equation gets destroyed.
...


THE vacuum analogy is flawed.
The external vacuum applies force to the pipe, which is relieved by the vent, which transfers the force to external air, which is then pulled through the pipe.
Close the vent and the pipe collapses.

In a rocket, fuel is burned, creating hot gases which are forced out the rear. The gases exert an equal force in the opposite direction, upon the rocket. [Newton's Third Law]
The internal force applied to the rocket is Thrust.
Applying impulse-momentum theory, derived from Newton's Second Law, the factors that determine thrust can be identified.

This is integration of concepts of Conservation of Linear Momentum and Conservation of Energy.
 Quoting: anon 30847320


Vacuum doesn’t apply a force you idiot. It simply creates a low pressure area and thus a pressure gradient. How the hell is a metal pipe gonna collapse?
 Quoting: Anonymous Coward 76755146


Ok. The pipe TENDS to collapse due to external atmospheric pressure. Happy? The vacuum FORCE is created by the MOTOR of the vacuum that you attached to the pipe. It actually exerts force on the gases within the pipe, but I simplified the explanation for the simple minded. Apparently you still didn't get it. The force on the gases within the pipe is transferred to gases OUTSIDE the pipe.

In a rocket, all the forces are INTERNAL. A force, created by burning the fuel pushes the gas away. The gas pushes back because it has mass.

Not that you, lacking a capacity for abstract concepts,
will be able to understand any of this.
 Quoting: anon 30847320


I'd bereal careful how you throw that "simple minded" term around: the vacuum motor doesn'"transfer the force to the gases outside:"

The atmosperic pressure at sea level is 14.7lb/sq in. the vacuum motor( fan) creates a lower pressure by moving the air (bernoulis law)(velocity creates lower pressure)and the atmosphere (14.7 lb/sqin.)rushes into fill the "vacuum".

Yes rapidly expanding gases push on the inside of the rocket thrust chamber evenly except over the hole in the thrust chamber( the nozzle). The saturn5 f-1 engines consumed fuel (MASS )at 15 TONS/SECOND EACH.

These threads rank right up there with "flat erf"
 Quoting: Anonymous Coward 77376498

You have no proof of what you claim
Anonymous Coward
User ID: 77431166
United States
03/05/2019 07:36 PM
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Re: NASA Thrust Equation gets destroyed.
...


Solids are not fluids. There are three different states of matter you know
 Quoting: Anonymous Coward 54328591


Not sure who's trying to prove what here, but conservation of momentum applies to solids, liquids, gases, plasmas ... every state of matter. Total momentum is conserved unless an external net force is applied. That's why rockets work.
 Quoting: oniongrass


Fluids move due to pressure gradient force. The pressure broke apart the soda can and physically pushed it. If there is nothing to push she. The gas moves to low pressure, there is no opposite force
 Quoting: Anonymous Coward 58747496


Your problem is that you're thinking of force.

F = ma is what Newton said. So one could conclude that with no external force, there's no acceleration. But he was wrong in the case of masses that change. That conclusion would be wrong.

Actually it's

F = dp/dt = ma + v dm/dt

so with no external force, momentum is conserved. And that's why rockets work. Because of the nonzero v dm/dt term.
 Quoting: oniongrass


So Newton was wrong? Do you have any evidence of this?
Kung Fu Lover

User ID: 76809044
United States
03/05/2019 07:36 PM
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Re: NASA Thrust Equation gets destroyed.
Chemical rocket thrust does not work in the vacuum of space.
Near the Earth, rocket thrust pushes against the atmosphere around the rocket.
In space, rocket thrust pushes against NOTHING.

If Chemical rockets can push against nothing, you should
be able to fly if you pull hard enough on your shoe laces.

No computer or maybe ALL the computers in the world
working together can not resolve a 3 body space problem.

All bodies in the conventionally accepted space model are claimed to be
moving through the universe between 800,000 mph to 2.2 million mph.
No body knows the exact speeds so nobody can calculate the movement
of a third body to go from on moving mass to another moving mass.

I do not KNOW the nature of those lights in the sky.
People through mass indoctrination ASSUME that the lights are
satellites created and launched by man.
 Quoting: Idaho Bullwinkle


Take an unloaded CO2 powered airgun with a full gas cylinder in place and tape it to skateboard. Rig the trigger with servo to be activated by remote control. Fire the gun. What happens to the skateboard? Now do the same experiment with the gun loaded. Notice the difference? By increasing the expelled mass the reaction is greatly enhanced. WHY?
 Quoting: Anonymous Coward 76256732


with no friction, Newtons 2nd Law of Motion Rules.
oniongrass

User ID: 77403676
United States
03/05/2019 07:45 PM
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Re: NASA Thrust Equation gets destroyed.
...


Not sure who's trying to prove what here, but conservation of momentum applies to solids, liquids, gases, plasmas ... every state of matter. Total momentum is conserved unless an external net force is applied. That's why rockets work.
 Quoting: oniongrass


Fluids move due to pressure gradient force. The pressure broke apart the soda can and physically pushed it. If there is nothing to push she. The gas moves to low pressure, there is no opposite force
 Quoting: Anonymous Coward 58747496


Your problem is that you're thinking of force.

F = ma is what Newton said. So one could conclude that with no external force, there's no acceleration. But he was wrong in the case of masses that change. That conclusion would be wrong.

Actually it's

F = dp/dt = ma + v dm/dt

so with no external force, momentum is conserved. And that's why rockets work. Because of the nonzero v dm/dt term.
 Quoting: oniongrass


So Newton was wrong? Do you have any evidence of this?
 Quoting: Anonymous Coward 77431166

Yeah, here are two proofs.

(1) Look at any modern physics textbook that deals with rocketry. Or just look up "conservation of momentum" and see that it's considered a fundamental principle of physics.

(2) Rockets work.

Last Edited by oniongrass on 03/05/2019 07:45 PM
Anonymous Coward
User ID: 77001174
United States
03/05/2019 08:03 PM
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Re: NASA Thrust Equation gets destroyed.
...


Fluids move due to pressure gradient force. The pressure broke apart the soda can and physically pushed it. If there is nothing to push she. The gas moves to low pressure, there is no opposite force
 Quoting: Anonymous Coward 58747496


Your problem is that you're thinking of force.

F = ma is what Newton said. So one could conclude that with no external force, there's no acceleration. But he was wrong in the case of masses that change. That conclusion would be wrong.

Actually it's

F = dp/dt = ma + v dm/dt

so with no external force, momentum is conserved. And that's why rockets work. Because of the nonzero v dm/dt term.
 Quoting: oniongrass


So Newton was wrong? Do you have any evidence of this?
 Quoting: Anonymous Coward 77431166

Yeah, here are two proofs.

(1) Look at any modern physics textbook that deals with rocketry. Or just look up "conservation of momentum" and see that it's considered a fundamental principle of physics.

(2) Rockets work.
 Quoting: oniongrass

Dude that’s not proof
Redcat1

User ID: 77352399
United States
03/05/2019 08:11 PM
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Re: NASA Thrust Equation gets destroyed.
Forget the rocket, how does the earth's atmosphere stay attached to the surface with no barrier between it and a near perfect vacuum? Gravity does not explain this. What is the barrier, and how do your magic rockets get through it?


 Quoting: Zetetic Ben


Gravity does explain it which is why the higher the altitude the thinner the atmosphere. If it was a dome and no gravity, the atmosphere would be uniform density.
 Quoting: Remedial_Rebel


That would be explained by density and buoyancy inside a fishbowl. Gravity is still just a theory. Not even your god Neil Degrasse Tyson can explain what it is.
 Quoting: Zetetic Ben



Gravity and static electrical attraction look A LOT alike.
oniongrass

User ID: 77403676
United States
03/05/2019 08:22 PM
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Re: NASA Thrust Equation gets destroyed.
...


Your problem is that you're thinking of force.

F = ma is what Newton said. So one could conclude that with no external force, there's no acceleration. But he was wrong in the case of masses that change. That conclusion would be wrong.

Actually it's

F = dp/dt = ma + v dm/dt

so with no external force, momentum is conserved. And that's why rockets work. Because of the nonzero v dm/dt term.
 Quoting: oniongrass


So Newton was wrong? Do you have any evidence of this?
 Quoting: Anonymous Coward 77431166

Yeah, here are two proofs.

(1) Look at any modern physics textbook that deals with rocketry. Or just look up "conservation of momentum" and see that it's considered a fundamental principle of physics.

(2) Rockets work.
 Quoting: oniongrass

Dude that’s not proof
 Quoting: Anonymous Coward 77001174

I cannot force you to understand. The physics and engineering professions will be OK without your contributions. Our loss is gender studies' gain.
Kung Fu Lover

User ID: 76809044
United States
03/05/2019 08:22 PM
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Re: NASA Thrust Equation gets destroyed.
as usual NASA is just cutting and pasting.

the Original Thrust Equation was derived by the Russian Physicist Konstantin Tsiolkovsky, in 1903.

something like this:

[link to wikimedia.org (secure)]
oniongrass

User ID: 77403676
United States
03/05/2019 08:27 PM
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Re: NASA Thrust Equation gets destroyed.
as usual NASA is just cutting and pasting.

the Original Thrust Equation was derived by the Russian Physicist Konstantin Tsiolkovsky, in 1903.

something like this:

[link to wikimedia.org (secure)]
 Quoting: Kung Fu Lover


Yeah. Start from what I wrote already

F = dp/dt = ma + v dm/dt

and set F=0 (no net external forces)

a = -(v/m) dm/dt

= -v d (ln m) / dt

where v is the nozzle ejection speed and a is the acceleration of the rocket body. Then just integrate that to get the formulas you gave.
Anonymous Coward
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Australia
03/05/2019 08:41 PM
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Re: NASA Thrust Equation gets destroyed.
...


How small does a chunk have to be to no longer have mass? Liquid or gas is kind of like a bunch of chunks.
 Quoting: syncro


Solids are not fluids. There are three different states of matter you know
 Quoting: Anonymous Coward 54328591


Not sure who's trying to prove what here, but conservation of momentum applies to solids, liquids, gases, plasmas ... every state of matter. Total momentum is conserved unless an external net force is applied. That's why rockets work.
 Quoting: oniongrass


Fluids move due to pressure gradient force. The pressure broke apart the soda can and physically pushed it. If there is nothing to push she. The gas moves to low pressure, there is no opposite force
 Quoting: Anonymous Coward 58747496


Oh gawd. Can't believe this one dimensional thinking.

Dude, here's a foolproof test you can do to prove you're wrong.

You can do it with a hose and water under pressure. Turn the hose on and feel the thrust back caused by the water being expelled under pressure.

Got that?

Now, place your hand a couple of inches in front of the flow. You will feel no change in the thrust.

You can do it with an air compressor too if you want to test it for gas.

Don't blow your hand off.
Kung Fu Lover

User ID: 76809044
United States
03/05/2019 08:44 PM
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Re: NASA Thrust Equation gets destroyed.
as usual NASA is just cutting and pasting.

the Original Thrust Equation was derived by the Russian Physicist Konstantin Tsiolkovsky, in 1903.

something like this:

[link to wikimedia.org (secure)]
 Quoting: Kung Fu Lover


Yeah. Start from what I wrote already

F = dp/dt = ma + v dm/dt

and set F=0 (no net external forces)

a = -(v/m) dm/dt

= -v d (ln m) / dt

where v is the nozzle ejection speed and a is the acceleration of the rocket body. Then just integrate that to get the formulas you gave.
 Quoting: oniongrass


yup. there's a reason why The Jet Propulsion Laboratory
is NASA's flag ship station.
Anonymous Coward
User ID: 77431423
United States
03/05/2019 09:23 PM
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Re: NASA Thrust Equation gets destroyed.
...


Solids are not fluids. There are three different states of matter you know
 Quoting: Anonymous Coward 54328591


Not sure who's trying to prove what here, but conservation of momentum applies to solids, liquids, gases, plasmas ... every state of matter. Total momentum is conserved unless an external net force is applied. That's why rockets work.
 Quoting: oniongrass


Fluids move due to pressure gradient force. The pressure broke apart the soda can and physically pushed it. If there is nothing to push she. The gas moves to low pressure, there is no opposite force
 Quoting: Anonymous Coward 58747496


Oh gawd. Can't believe this one dimensional thinking.

Dude, here's a foolproof test you can do to prove you're wrong.

You can do it with a hose and water under pressure. Turn the hose on and feel the thrust back caused by the water being expelled under pressure.

Got that?

Now, place your hand a couple of inches in front of the flow. You will feel no change in the thrust.

You can do it with an air compressor too if you want to test it for gas.

Don't blow your hand off.
 Quoting: Anonymous Coward 77431289


Actually you do feel the change in thrust. So I have a water hose a full pressure pointing at the air. The I point at the wall a few inches away, massive thrust change bro. Not only that you get soaked from the splash back.
Anonymous Coward
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03/05/2019 09:23 PM
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Re: NASA Thrust Equation gets destroyed.
Astro will not be pleased.
 Quoting: Anonymous Coward 76219184


Did Astros prediction about the eclipse come true or is he back at the drawing board.
Anonymous Coward
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03/05/2019 09:28 PM
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Re: NASA Thrust Equation gets destroyed.
...


Your problem is that you're thinking of force.

F = ma is what Newton said. So one could conclude that with no external force, there's no acceleration. But he was wrong in the case of masses that change. That conclusion would be wrong.

Actually it's

F = dp/dt = ma + v dm/dt

so with no external force, momentum is conserved. And that's why rockets work. Because of the nonzero v dm/dt term.
 Quoting: oniongrass


So Newton was wrong? Do you have any evidence of this?
 Quoting: Anonymous Coward 77431166

Yeah, here are two proofs.

(1) Look at any modern physics textbook that deals with rocketry. Or just look up "conservation of momentum" and see that it's considered a fundamental principle of physics.

(2) Rockets work.
 Quoting: oniongrass

Dude that’s not proof
 Quoting: Anonymous Coward 77001174


To prove this science to some dotards, we'd have to shoot them into space.
Anonymous Coward
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03/05/2019 09:33 PM
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Re: NASA Thrust Equation gets destroyed.


[link to www.youtube.com (secure)]
Anonymous Coward
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03/05/2019 09:35 PM
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Re: NASA Thrust Equation gets destroyed.
Chemical rocket thrust does not work in the vacuum of space.
Near the Earth, rocket thrust pushes against the atmosphere around the rocket.
In space, rocket thrust pushes against NOTHING.

If Chemical rockets can push against nothing, you should
be able to fly if you pull hard enough on your shoe laces.

No computer or maybe ALL the computers in the world
working together can not resolve a 3 body space problem.

All bodies in the conventionally accepted space model are claimed to be
moving through the universe between 800,000 mph to 2.2 million mph.
No body knows the exact speeds so nobody can calculate the movement
of a third body to go from on moving mass to another moving mass.

I do not KNOW the nature of those lights in the sky.
People through mass indoctrination ASSUME that the lights are
satellites created and launched by man.
 Quoting: Idaho Bullwinkle


This is simply wrong. You can easily test it on earth. Vacuum chambers are easy to create and chemical rockets absolutely DO work in the vacuum.
Anonymous Coward
User ID: 58993589
Canada
03/05/2019 09:37 PM
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Re: NASA Thrust Equation gets destroyed.
Chemical rocket thrust does not work in the vacuum of space.
Near the Earth, rocket thrust pushes against the atmosphere around the rocket.
In space, rocket thrust pushes against NOTHING.

If Chemical rockets can push against nothing, you should
be able to fly if you pull hard enough on your shoe laces.

No computer or maybe ALL the computers in the world
working together can not resolve a 3 body space problem.

All bodies in the conventionally accepted space model are claimed to be
moving through the universe between 800,000 mph to 2.2 million mph.
No body knows the exact speeds so nobody can calculate the movement
of a third body to go from on moving mass to another moving mass.

I do not KNOW the nature of those lights in the sky.
People through mass indoctrination ASSUME that the lights are
satellites created and launched by man.
 Quoting: Idaho Bullwinkle


This is simply wrong. You can easily test it on earth. Vacuum chambers are easy to create and chemical rockets absolutely DO work in the vacuum.
 Quoting: Anonymous Coward 77042712


Proof would be nice
Anonymous Coward
User ID: 77042712
United States
03/05/2019 09:39 PM
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Re: NASA Thrust Equation gets destroyed.
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