The Zeno effect

[sasguru]

That's why threaded's posts take so long to read.

[threaded]

It's not bollux - it is correct.

A clock at a highter "altitude" would run at a different time to one at "ground-level".

This is nothing to do with air-pressure or mechanical effects, but with gravity.


Read up on general relativity. The closer you are to a large gravitational body, the slower your time runs (there is no 'universal time' - everyone has their own 'personal' time depending on how fast they are moving in relation to something else).

Utter bollox, Now you're showing your lack of understanding.

The clock that went up the hill was accelerated in a gravitational field. That's the reason time slowed.

HTH

[oliver]

Because it is an artifact of the mathematical model.

Consider bogeyman walking down the railway line at 5 kph, a train coming the opposite way hits him at 200 kph.

i.e. he goes from 5 kph to -200 kph.

So according to the model when he is stuck on the front of the train at some point he is doing 0 kph, hey, but he is stuck to the front of the train, is that not also doing 0 kph at that time?

What about the effect of wind resistance on the train?

What if there was a very strong wind blowing in the opposite direction to that which the train is travelling? Would you not agree that if the wind was strong enough the train would stop moving forward and actually come to a standstill? According to what you have said this is impossible because nothing in your example can ever have a zero velocity.

What if there were thousands of bogeymen standing on the track? Do you not agree that the train would not be able to plough through them all spraying blood and carcasses all over the place with no effect on its speed whatsoever?

[bogeyman]

Utter bollox, Now you're showing your lack of understanding.

The clock that went up the hill was accelerated in a gravitational field. That's the reason time slowed.

HTH

Threaded - you clueless feck...

You obviously know nothing whatsoever about the subject, so kindly shut the feck up.

[expat]

Threaded - you clueless feck...

You obviously know nothing whatsoever about the subject, so kindly shut the feck up.

Worse than nothing - he's obviously confusing it with special relativity and one clock moving relative to another in an inertial field. As against general relativity, and a gravitational field being equivalent to acceleration in an inertial reference frame.

[Fungus]

I was confused long before Quantum Theory came along. If

"For every action, there is an equal and opposite reaction."

how come I can move then?

Because you push against the ground. As you move forward, so the Earth moves backwards. But as you are so much smaller and lighter than the Earth, the dominant effect is your motion forwards. That is action and reaction. Of course in the case of Threaded the Earth might move backwards by an observable amount. (There seems to be the suggestion that he is of near planetary status.)

I hate to side with Threaded, because in this thread he is to rational thought what pork chops are to Muslim cuisine, but he has a point about Quantum Physics. Einstein was greatly troubled by its probabilistic nature, famously saying that "God does not play dice". There are many interpretations of Quantum Physics, some of which try to work their way out of the philosophical unpleasantness of a theory that seems to say nothing about underlying reality, and instead plays around with probabilities. Even today some physicists are trying to find more satisfying alternatives. But, it does work extremely well. And thus far all of the tests support theory.

Personally I feel ill at ease with a theory that seems to have no underlying reality.

[bogeyman]

Worse than nothing - he's obviously confusing it with special relativity and one clock moving relative to another in an inertial field. As against general relativity, and a gravitational field being equivalent to acceleration in an inertial reference frame.

Touchet mon ami!

But you don't think that was Threaded's point, really, do you?

[threaded]

Numbskulls, all accelerations have gravitation, it's called the equivalence principle. So going up (and down) the hill has one effect on the clock, and staying up the hill has the opposite. Go up and straight down the hill will cause the clock to lose time, going up and staying there for a time long enough will cancel this out and eventually the clock will appear to go faster.

[Fungus]

Numbskulls, all accelerations have gravitation, it's called the equivalence principle. So going up (and down) the hill has one effect on the clock, and staying up the hill has the opposite. Go up and straight down the hill will cause the clock to lose time, going up and staying there for a time long enough will cancel this out and eventually the clock will appear to go faster.

And to think that when Jack and Gill went up the hill to fetch a pail of water, little did they know about the philosophical underpinnings of their actions.

But then again did the Three Little Pigs realise that they were demonstrating the perils of a completely unregulated market economy?

[threaded]

I think you have my thesis understood there: the model only works for the certain select cases it represents, but reality is so much wider, and trying to shoehorn the model to things it doesn't represent is just so silly.