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Electroboom: How Right IS Veritasium?! Don't Electrons Push Each Other??

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Naej:

--- Quote from: electrodacus on July 12, 2022, 11:22:36 pm ---
--- Quote from: Naej on July 12, 2022, 11:10:01 pm ---Yes the ball is coming from the front of the vehicle.
And you accelerate it with your bat. Because you use recoil.
Now compute the recoil with a 2J bat and a 1t ball.

--- End quote ---

OK, I guess we can get closer.
The bat weight means nothing as it is part of the vehicle total weight.
The 2J is energy I like to refer to it as 2Ws (2 Watt for one second or 1W for 2 seconds or any other combination).
In order to supply your batt with 2J you need to take 2J at the wheel and that will be subtracted from the vehicle kinetic energy meaning vehicle will have slightly lower speed after you take those 2J at the wheel.

So 2J is all you get best case (ideal) in terms of propulsion from your bat.

--- End quote ---
I didn't ask what you wrongly believe to be the best case, I asked exactly what will happen.
A 2 "Ws" bat collides with a 1t ball, what is the recoil?

There may be a solution here: https://en.wikipedia.org/wiki/Elastic_collision#One-dimensional_Newtonian

electrodacus:

--- Quote from: Naej on July 12, 2022, 11:25:17 pm ---I didn't ask the best case, I asked exactly what will happen.
A 2 "Ws" bat collides with a 1t ball, what is the recoil?

--- End quote ---

You care what happens with the car not with the ball.
If all you have to spend is 2Ws then all you get best case is 2Ws worth of propulsion.
You can apply that 2Ws to the wheel pushing against the ground or to the batt pushing against the ball is same thing in ideal case. In real world is better to apply to wheel as is more efficient.

Naej:

--- Quote from: electrodacus on July 12, 2022, 11:42:55 pm ---
--- Quote from: Naej on July 12, 2022, 11:25:17 pm ---I didn't ask the best case, I asked exactly what will happen.
A 2 "Ws" bat collides with a 1t ball, what is the recoil?

--- End quote ---

You care what happens with the car not with the ball.
If all you have to spend is 2Ws then all you get best case is 2Ws worth of propulsion.
You can apply that 2Ws to the wheel pushing against the ground or to the batt pushing against the ball is same thing in ideal case. In real world is better to apply to wheel as is more efficient.

--- End quote ---
I asked the recoil on the bat.
You can compute it with these formulae: https://en.wikipedia.org/wiki/Elastic_collision#One-dimensional_Newtonian
Are you afraid to compute it in case it will lead to more than 2Ws? (coefficient of performance>1)

electrodacus:

--- Quote from: Naej on July 12, 2022, 11:45:04 pm ---I asked the recoil on the bat.
You can compute it with these formulae: https://en.wikipedia.org/wiki/Elastic_collision#One-dimensional_Newtonian
Are you afraid to compute it in case it will lead to more than 2Ws? (coefficient of performance>1)

--- End quote ---

Fine I will waste more of my time most likely.

Vehicle was 300kg driving at 20m/s relative to ground through a space filled with balls traveling in the same direction at just 10m/s
Starting vehicle kinetic energy 0.5 * 300kg * 20m/s2 = 60000Ws 
We take 2Ws from the wheel so 60000Ws - 2Ws = 59998Ws
New vehicle speed sqrt(59998 / (300 * 0.5)) = 19.9996666m/s
Bat now has the 2Ws available to hit a ball you mentioned 1000kg ball but it makes no difference for the vehicle as you will see
When the bat hits the ball it will take 2Ws from the ball kinetic energy and transfer to vehicle (ideal case).
The ball was moving at 10m/s relative to the ground so it had
0.5 * 1000 * 102 = 50000Ws
Will have 2Ws less after the hit so you can calculate how much lower the speed will be relative to the ground (not much as is a hughe 1000kg ball).
The vehicle again ideal case will gain thoe 2Ws so will be back at 60000Ws and so back to 20m/s
 

 

PlainName:

--- Quote from: electrodacus on July 12, 2022, 10:19:45 pm ---
--- Quote from: dunkemhigh on July 12, 2022, 10:09:58 pm ---
Completely irrelevant. Either it is producing thrust - small, large, whatever - or it is not. You can argue about how much and where the power is coming from later.

So, are you saying a turning prop is not producing thrust?

--- End quote ---

Actually highly relevant.
The propeller produces thrust but the energy it took from the wheels produced what you can call anti-thrust.

--- End quote ---

What is anti-thrust? Is it blowing the wrong way or what? No, forget that - that's just another dead cat you're playing.

You can argue where and how the power is stolen some other message. We don't care if the vehicle is speeding up, down, sideways or outside the wire, but just this once please answer this single thing.

You agree that the turning prop, HOWEVER IT'S POWERED, is producing thrust in the rearward direction?

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