bullet from a gun on a train

[HangOver]

If you shoot a gun out the window of a train moving at 100mph towards the front of the train, bearing in mind the bullet velocity is also 100mph at what speed would the bullet be traveling once it leaves the barrel of the gun?

0 mph
100 mph
200 mph
Don't give a ....
other

* I know its old n crappy but its the ony one I know the answer to :D

[Sprint]

C'mon people, say it with me

D

I

L

L

I

G

A

F

whaddasthat spell? DILLIGAF!

[B92 8NW]

The relative or absolute speed of the bullet?

[rovercare]

Its funny:D




Cause you can;t make a poll:p

[abaddonxi]

What happens if the train goes into the tunnel?


























I'll tell ya tomorrow.

[B92 8NW]

Its funny:D




Cause you can;t make a poll:p

I'll show you mine if...

[harry]

wgaf!!!!!!!!!!!!!

[Lotz-A-Landies]

We all know that to travel at light speed everything is infinitely heavy and you need infinite energy to propel you. So if you are in a space ship going at 0.999999999' of light speed and you shoot a bullet in the same direction as you are travelling, how fast will the bullet be going?

[dullbird]

If your car was travelling at the speed of light would your headlights work in regards to lighting up the road ahead?

[dullbird]

hypothetical...coops;)

[procrastination inc]

We all know that to travel at light speed everything is infinitely heavy and you need infinite energy to propel you. So if you are in a space ship going at 0.999999999' of light speed and you shoot a bullet in the same direction as you are travelling, how fast will the bullet be going?

depends on which inertial frame you measure the speed of the bullet from

[procrastination inc]

If your car was travelling at the speed of light would your headlights work in regards to lighting up the road ahead?

at c, the road ahead is infinitely short. you might say that you see all of it at once.

messy business light speed, best just to avoid it and use the hyperspace bypass

[HangOver]

The relative or absolute speed of the bullet?

All speeds are relative to one reference point or another.

[MacMan]

I resemble that comment. I have relatives...

[sam_d]

If your car was travelling at the speed of light would your headlights work in regards to lighting up the road ahead?

You wouldn't be able to get your car up to light speed as to do so would require infinite amounts of energy. However, if you were to be moving at 99.999999999% of the speed of light and you switched your headlights on you wouldn't see the beam of light moving away from you at 0.000000001% of the speed of light, you would see the beam instantly light up ahead of you as far as the beam would if you were stationary.

This is how Einstein's theory relativity would show the scenario due to the curvature of spacetime. In essence the curvature of spacetime means that the faster you go, the slower time goes.

At least, this is what I remember of A Level physics. Oh, and don't go trying to reach these kinds of speeds in your Disco - I'm not sure the serpentine belt would hold out :)

[Redback]

Nothing travels faster than the speed of light with the possible exception of bad news, which obeys its own special laws.

Douglas Adams
Hitchhikers Guide to the Galaxy:D

Baz.

[seano87]

All speeds are relative to one reference point or another.

But it is important to know for this question, the speed relative to the person on the train is different to the speed relative to the outside world not moving!

I assumed you meant relative to the real world.

[WedWon]

If you shoot a gun out the window of a train moving at 100mph towards the front of the train, bearing in mind the bullet velocity is also 100mph at what speed would the bullet be traveling once it leaves the barrel of the gun?

0 mph
100 mph
200 mph
Don't give a ....
other

* I know its old n crappy but its the ony one I know the answer to :D

Bullet from Train

Train Speeed= 100mph
Terminal Velocity of Bullet = 100mph
Inertial Starting point = 100mph

v = 100 X 100
. .. 100

BUT 100 = Terminal Velocity not starting velocity

so: v = (F = D - W) X 100
. ............. 100

Where F is Net Force
D is Drag (D = Cdp V2A)
. ......................... 2
W is Weight

Assuming bullet eights about 25g
Assuming drag = weight

Then F = D - W = 0
so Cdp V2A = W
........... 2

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Importantly:
+ 6B + 1A

Where B is Beer
A is Aulro'er

= Contented state of bliss where 1A couldn't care less about F'in Bullets and trains (and bullet trains) and just made up the above calculations to see if anyone was paying attention

[HangOver]

But it is important to know for this question, the speed relative to the person on the train is different to the speed relative to the outside world not moving!

I assumed you meant relative to the real world.

Got it in one really.

The speed would be both/either 100mph or 200mph depending on which frame the the relative speed was measured. ie relative to the ground or relative to the person firing the gun.

[barney]

OK, SO man A gets on a train in town A at 10:30 in the morning. Man B boards a train in town B at 11:00 in the same morning.
Town A and Town B are exactly 300km apart.
Train A is a 7 car train and is travelling at 80km/h towards town B. it has to make 5 stops at stations along the way and each stop will take exactly 5 minutes. accelleration for an engine with no carriages is 8m/s, this is extended for each carriage by .3m/s.
train B is a 9 car train travelling in the direction of Town A, it travels at 90km/h and makes 12 stops along the way, each stop taking 5 minutes. the engine in this train accellerates at 9 m/s/s with no carriages and takes an extra .2m/s/s for every carriage it has.
assuming they both leave at the exact time man A and man B board, how long will it take to fill the bath?

[carjunkieanon]

In discworld light travels slowly. When the sun comes up the light slowly flows down over the hills to reach the city of Ankh-Morpok

That said, the only thing faster than light is the speed of Dark. No matter how fast light travels, dark is always ahead of it.

[Outlaw]

In discworld light travels slowly. When the sun comes up the light slowly flows down over the hills to reach the city of Ankh-Morpok

That said, the only thing faster than light is the speed of Dark. No matter how fast light travels, dark is always ahead of it.
So Lucas wins?