If you were standing on a train travelling at high speed

[Tollers]

IT'S not true. Hehehe "delta time"?. Physics must have moved on a lot since my engineering degree. Time is linear, not discrete. There is no smallest amount of time. You can always add an extra decimal point.

"In the train's case, delta distance / delta time will be close to zero, so for that tiny, tiny period of time, the train does not move."

speed = distance / time
10m/s = 10m / 1s
10m/s = 1m/ 0.1s
10m/s = 0.1m/0.01s
......
10m/s = 0.00000000000000000000000001m / 0.00000000000000000000000001s

as you tend to smaller units of time.....the train is still moving and going just as quick.

 

[661-Pete]

The moment you jump the propulsion is removed and although you have inertia, drag will start to slow you down.

I wish to state categorically that I have never travelled on a train in drag....

In seriousness, there will be no drag inside the train where everything inside it, including the air, is moving at the same speed as the train...

 

[jimboalee]

As a matter of fact, there are several parts if the train that are moving backwards

 

[661-Pete]

Ha! The 'fly' paradox. Seen that before somewhere.

A train is not entirely rigid. Indeed its material is composed of atoms bonded together by chemical bonds - essentially electromagnetic forces which obey the laws of electromagnetism and quantum mechanics.

These atoms can nevertheless move relative to each under under great stress. When the fly strikes, momentarily some of the atoms in the trains windscreen are violently decelerated and may even move backwards for an instant. Just as the atoms in the fly are even more violently accelerated forwards. But this is only a few of the train's atoms: the vast majority continue their forward journey with no deceleration.

 

[Tollers]

Ha! The 'fly' paradox. Seen that before somewhere.

A train is not entirely rigid. Indeed its material is composed of atoms bonded together by chemical bonds - essentially electromagnetic forces which obey the laws of electromagnetism and quantum mechanics.

These atoms can nevertheless move relative to each under under great stress. When the fly strikes, momentarily some of the atoms in the trains windscreen are violently decelerated and may even move backwards for an instant. Just as the atoms in the fly are even more violently accelerated forwards. But this is only a few of the train's atoms: the vast majority continue their forward journey with no deceleration.

Even at an atomic level, newtonian physics still aplies. The few atoms will not move backwards as the atoms behind them will still be moving forwards and newtons third law comes into play. They will certainly slow down fractionally though!

How the world works

Now.....sub-atomic quantum mechanics is out of my league....so feel free

Tollers

 

[jimboalee]

"Time is an illusion. Lunch time, doubly so".

Man invented 'time'.

It depends if you have been conditioned to think in the 'created by man' time illusion.

If you think sideways for a moment, everything that is happening is happening in infantecimal micro-movements.

The universe has two conditions where 'man's idea of time' stops.
Absolute zero ( 0 Kelvin ) and the speed of light.

We exist between these two extremes, 'a little bit at a time'.

 

[Tollers]

"Time is an illusion. Lunch time, doubly so".

Man invented 'time'.

It depends if you have been conditioned to think in the 'created by man' time illusion.

If you think sideways for a moment, everything that is happening is happening in infantecimal micro-movements.

The universe has two conditions where 'man's idea of time' stops.
Absolute zero ( 0 Kelvin ) and the speed of light.

We exist between these two extremes, 'a little bit at a time'.

LOL. Are you being serious?

 

[rich p]

LOL. Are you being serious?

I think he's being infinitesimally infantecimal

 

[jimboalee]

Ha! The 'fly' paradox. Seen that before somewhere.

A train is not entirely rigid. Indeed its material is composed of atoms bonded together by chemical bonds - essentially electromagnetic forces which obey the laws of electromagnetism and quantum mechanics.

These atoms can nevertheless move relative to each under under great stress. When the fly strikes, momentarily some of the atoms in the trains windscreen are violently decelerated and may even move backwards for an instant. Just as the atoms in the fly are even more violently accelerated forwards. But this is only a few of the train's atoms: the vast majority continue their forward journey with no deceleration.

Yup, everything is fluid. Even the latice structure of pure Carbon ( diamond ) moves when it collides with something.

The term 'Rock solid' is a misnomer because rock creeps. Evidence of this is the Moon on a starry night. It is spherical because the rock has crept into the shape which has lowest surface area per volume. 4.6 billion years mind, but it's reshaped under it's own gravity.

The train's windsheild will deform on impact. Some atoms may well move in a contrary direction because the fly's mass had velocity in opposition to the train.

The number of attoseconds in man's measurement frame will not be many.

 

[Tollers]

I'm not sure.....i think i can see an artist's logic in there somewhere, but definitely not a scientists.

I think the Jimbonian laws of physics might make a more entertaining world.

Tollers

 

[jimboalee]

Deadly serious ???

1 day = 1 revolution of the Earth on it's axis.
This is the only measurement of time we need to be concerned with. The other four time intervals are the Solstices and Equinoxes.

1 year = the complete orbit of the Earth around the sun.

Man's life = 100 +/- 20.
The Earth's life = 4,600,000,000 and counting.

The Earth = a grain of sand in the universe.

 

[ASC1951]

Yup, everything is fluid. ... Evidence of this is the Moon on a starry night. It is spherical because the rock has crept into the shape which has lowest surface area per volume. 4.6 billion years mind, but it's reshaped under its own gravity.

Unlike the Earth, of course, which over the same period and for the same reason has become an oblate spheroid.

That is why I am going up Mt Chimorazo next June. It is the highest point on Earth, measured from the centre.

 

[Tollers]

Unlike the Earth, of course, which over the same period and for the same reason has become an oblate spheroid.

That is why I am going up Mt Chimorazo next June. It is the highest point on Earth, measured from the centre.

Highest point is a man made concept. Do not concern yourself with that. Just remember that on an attosecond level. You are not moving. In fact...you are moving the mountain.

p.s there is no spoon

Anyway. 5:45. Time for the pub

 

[dellzeqq]

and if the train was deccellerating, would you get in to first class?

 

[Panter]

Surely you will land slightly further back. You are being propelled along courtesy of the train. The moment you jump the propulsion is removed and although you have inertia, drag will start to slow you down. The higher you jump (i.e the longer the drive from the train is removed) the further back you will go (relative to the train) you will still be traveling forwards, but you will be decelerating (due to drag) while the train will be continuing at the same speed.

Or you may get hit by a bridge

I still think this is true though, isn't it? except the drag bit.

Whilst on the train, are you not kept at speed due to the movement of the train transferred through your feet and as you jump, that momentum stops being applied?

Ok, so the volume of air you're in is travelling at the same speed as the train but surely it won't provide as much "push" as the floor of the train through your feet?

I'm sure you would land in pretty much the same place, but surely you'd be a few fractions of mm's further back, depending on how long you were airbourne?

Or not...