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Physics Anonymous Mon Jul 1 17:14:10 2019 No.10772052 [Reply] [Original]

If you are on a train that is moving at a constant speed, no turns, no bumps, no air resistance; and you have a gun. The train let's say moves at 1000 mph and the gun shoots the bullet at 1000 mph, if you shoot the bullet off the back of the train, won't the bullet be moving at 2000 mph in respect to an observer on the ground? Similarly if you are at the front, won't the bullet be traveling as well at 2000 mph in respect to an observer on the ground?

>>	Anonymous Mon Jul 1 17:17:22 2019 No.10772057 relative to the ground does the bullet even move?

Anonymous Mon Jul 1 17:23:19 2019 No.10772073

>>10772052
>The train let's say moves at 1000 mph and the gun shoots the bullet at 1000 mph, if you shoot the bullet off the back of the train, won't the bullet be moving at 2000 mph in respect to an observer on the ground?
Why do you think it would? Motion has a direction, not just a magnitude.

>>	Anonymous Mon Jul 1 17:23:54 2019 No.10772076 >>10772057 well because there is gravity it would just fall to the ground then, but that seems hard to visualize.

>>	Anonymous Mon Jul 1 17:24:57 2019 No.10772079 >>10772073 well <----bullet train--->

>>	Anonymous Mon Jul 1 17:32:08 2019 No.10772099 >>10772057 and since this bullet is moving at supersonic speeds would there be a sonic boom?

>>	Anonymous Mon Jul 1 17:38:42 2019 No.10772114 >>10772099 No air resistance, no sonic boom

Anonymous Mon Jul 1 18:14:04 2019 No.10772205

The train is moving 1000 mph and you are standing on the train (where you are standing on the train doesn't make any difference). Bullets travel 1000 mph relative to the muzzle of the gun. You fire bullet A forward of the train and bullet B aft of the train. We are ignoring the presence of air and the effects of special relativity (very important).
Bullet A travels 1000 mph relative to you and 2000 mph relative to ground. Bullet B travels 1000 mph relative to you and 0 mph relative to the ground.

>>	Anonymous Mon Jul 1 18:22:38 2019 No.10772225 >>10772205 so if i'm on the ground and touch the bullet what will happen?

>>	Anonymous Mon Jul 1 18:59:20 2019 No.10772335 >>10772225 Then you will get shot

>>	Anonymous Mon Jul 1 20:27:42 2019 No.10772557 >>10772335 makes no sense to me then. How the fuck does it freeze in space?!?!?!?!

>>	Anonymous Mon Jul 1 20:29:44 2019 No.10772562 >the absolute state of /sci/

>>	Anonymous Mon Jul 1 21:48:11 2019 No.10772759 >>10772052 Answered here. https://youtu.be/ZH7GpYJoptU

Anonymous Mon Jul 1 22:07:02 2019 No.10772799

>>10772557
Man, it does not "freeze".
It has an initial velocity (that of the train). By shooting it in the opposite direction, it "brakes" respect to the ground.
If instead of shooting it you merely dropped it out of the train, to someone standing in the ground, he would get shot by a bullet moving at 1000mph.

>>	Anonymous Mon Jul 1 22:12:15 2019 No.10772810 No because the bullet won't even shot

Anonymous Mon Jul 1 22:24:02 2019 No.10772823

>>10772205
Oh yeah buddy? Why don't ya get on board one of them fast trains and give it a fucking try. Till put your money where ya mouth is, I don't believe this. u can't find a train than u can do it standing on a airplan with magnetic fucking boots to hold your scrawn ass in place. No ground effect there either so well see, dipstick.

>>	Anonymous Mon Jul 1 22:26:00 2019 No.10772827 >>10772205 >(where you are standing on the train doesn't make any difference). Go stand on the roof of a train going 1000 miles and hour and then come back here and say that.

>>	Anonymous Mon Jul 1 23:26:45 2019 No.10772909 >>10772827 >ignoring the existence of air

>>	Anonymous Mon Jul 1 23:47:40 2019 No.10772943 >>10772799 Right, i get that. but then could it kill a person?

>>	Anonymous Mon Jul 1 23:57:01 2019 No.10772953 >>10772759 THANKS A MILLION!!!!

Anonymous Tue Jul 2 00:00:35 2019 No.10772960

>>10772557
>How the fuck does it freeze in space
Frames of Reference, dude.
Have you ever been on a train or bus and started running opposite the direction of travel so you're standing still relative to someone watching from the platform?
https://youtu.be/bJMYoj4hHqU

>>	Anonymous Tue Jul 2 00:18:11 2019 No.10772985 >>10772960 I have been on many train platforms so I guess I can't say it was easy for me to visualize. That one mythbusters video had multiple camera angles and so I was really able to get it. This video helps too!

>>	Anonymous Tue Jul 2 00:31:57 2019 No.10773005 >>10772960 https://www.youtube.com/watch?v=jLV4NMsWxUc This works too!

>>	Anonymous Tue Jul 2 00:46:10 2019 No.10773018 >>10772052 http://mathworld.wolfram.com/VectorAddition.html

>>	Anonymous Tue Jul 2 00:48:54 2019 No.10773020 Are the whole lot of you 13 years old? /sci/ threads are getting dumber and dumber every day.

>>	Anonymous Tue Jul 2 00:54:02 2019 No.10773029 >>10772052 do your own homework

>>	Anonymous Tue Jul 2 00:57:47 2019 No.10773033 https://www.youtube.com/watch?v=BLuI118nhzc yawn. Can we have some novel thoughts/threads please?

>>	Anonymous Tue Jul 2 01:05:31 2019 No.10773041 >>10772943 No. A person on the ground would observe a bullet free falling to the ground.

>>	Anonymous Tue Jul 2 11:10:57 2019 No.10773670 >>10772052 https://www.youtube.com/watch?v=BLuI118nhzc

Anonymous Tue Jul 2 11:24:08 2019 No.10773702

Ok, since this thread is literally elemetary school level, I'm gonna bump you into entry college level: What if we DO NOT ignore the existence of air. Assume the train travels at 1000 miles / hour, well over speed of sound. You fire the bullet out of a train in an opposite direction at 1000 miles / hour. Will the ground observer see a bullet fall to the ground WHILE doing a massive sonic boom shockwave?

>>	Anonymous Tue Jul 2 13:24:55 2019 No.10773855 >>10773702 the train is doing the booming all the time while probably creating some kind of wind shadow for the bullet to fall down in peace

>>	Anonymous Tue Jul 2 15:07:49 2019 No.10774035 >>10773702 How fast is the bullet if you fire it at a 40 degree angle off from straight behind? 60 degrees? 39? 37 degrees? 1 degree?

Anonymous Tue Jul 2 15:11:14 2019 No.10774046

>>10773702
No because the train already has a sonic boom which produces a "cone" that extends behind the train where the air pressure is a lot lower than the surrounding. Shooting a bullet towards that direction will cause it to not have a sonic boom due to this.

But let's say that somehow air pressure restored fast due to magic then YES the bullet would create a small sonic boom in the other direction while looking stationary to the observer on the ground.

>>	Anonymous Tue Jul 2 16:33:25 2019 No.10774249 >>10772052 What about the Milky Way spinning 1.3 million miles per hour?

>>	Anonymous Tue Jul 2 16:35:24 2019 No.10774254 >>10772225 Instant US citizenship.

>>	Anonymous Tue Jul 2 16:37:27 2019 No.10774258 >>10773702 Is it open or closed cabin?

Anonymous Tue Jul 2 18:09:30 2019 No.10774493

>>10772052
Due to extensive research done by the University of Pittsburgh, diamond has been confirmed as the hardest metal known to man. The research is as follows. Pocket-protected scientists built a wall of iron and crashed a diamond car into it at 400 miles per hour, and the car was unharmed. They then built a wall out of diamond and crashed a car made of iron moving at 400 miles an hour into the wall, and the wall came out fine. They then crashed a diamond car made of 400 miles per hour into a wall, and there were no survivors. They crashed 400 miles per hour into a diamond traveling at iron car. Western New York was powerless for hours. They rammed a wall of metal into a 400 mile per hour made of diamond, and the resulting explosion shifted the earth's orbit 400 million miles away from the sun, saving the earth from a meteor the size of a small Washington suburb that was hurtling towards mid-western Prussia at 400 billion miles per hour. They shot a diamond made of iron at a car moving at 400 walls per hour, and as a result caused two wayward airplanes to lose track of their bearings, and make a fatal crash with two buildings in downtown New York. They spun 400 miles at diamond into iron per wall. The results were inconclusive. Finally, they placed 400 diamonds per hour in front of a car made of wall traveling at miles per iron, and the result proved without a doubt that diamonds were the hardest metal of all time, if not just the hardest metal known to man.

Tl;Dr
Carbon nanites. It's always Carbon nanites.

>>	Anonymous Tue Jul 2 18:11:47 2019 No.10774503 >>10772057 Fucking learn to Frame of Reference. https://en.wikipedia.org/wiki/Free_motion_equation

>>	Anonymous Wed Jul 3 08:13:58 2019 No.10776087 This thread is like the 0.5kg of flies in a jar one. Someone should really make a meme of that but for this

>>	Anonymous Wed Jul 3 09:41:38 2019 No.10776243 >>10772827 Astronauts doing this all the time. But their train (spaceship) is going even faster.

>>	Anonymous Wed Jul 3 10:36:54 2019 No.10776338 >>10772052 forward would be 2000 mph, backwards would be 0 mph wrt an observer outside the train. The bullet would, from an internal perspective, do all the stuff expected of a 1000 mph bullet

>>	Anonymous Wed Jul 3 14:31:35 2019 No.10776794 This thread really makes me think that /sci is full of people who self proclaims themself smart but they are not even remotely. How is it possible to argue so much on this question? That's literally a first high school year problem.

>>	Anonymous Wed Jul 3 14:33:20 2019 No.10776797 >>10772943 If the person was going 1000mph wrt the bullet then yes

>>	Anonymous Wed Jul 3 14:35:08 2019 No.10776801 File: 912 KB, 500x500, 1383372047413.gif [View same] [iqdb] [saucenao] [google] >>10772205 Great bait, in more ways than I can count.

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