Things you always wanted to know the answer to [Vol. 3]
Discussion
Dr Jekyll said:
Apparently time dilation has been demonstrated on a small scale via clocks in spacecraft but the same problem arises. Is it the acceleration that's causing the dilation in this case?
No - just the relative velocity. It's why the clocks aboard certain satellites e.g. GPS have to be continually updatedhypothetically speaking if you travelled to another country (or came back to this one) and you was over the limit on how much alcohol you could bring (lets say you brough 1 bottle of vodka too many), would you be allowed to have a chug of the excess bottle before they confiscate it?
do they take all bottles? ive always stayed within the limit.
do they take all bottles? ive always stayed within the limit.
MartG said:
Dr Jekyll said:
Apparently time dilation has been demonstrated on a small scale via clocks in spacecraft but the same problem arises. Is it the acceleration that's causing the dilation in this case?
No - just the relative velocity. It's why the clocks aboard certain satellites e.g. GPS have to be continually updatedPommygranite said:
In commercial/industrial fire extinguisher systems there is a little glass vial of liquid above the pipe and the glass it to break in the event of a fire - what's the liquid?
I'm not sure on the name of the liquid (possibly the same liquid that's used in non mercury thermometers?) but the glass vial holds a stopper in place which in turn holds back pressurised water, gas or sometimes air. When subjected to heat the liquid expands breaking the vial and releasing the water to extinguish the fire. Somewhere inline on that pipe will be a flow switch to start up the water pumps or release a gas extinguishing agent. The colour of the liquid dictates the temperature at which the vial will break such as red for 65 degrees, blue for 85 degrees etc..
It's a common movie mistake that smoke will set off a sprinkler and that all sprinklers will be set off simultaneously. They react locally to heat sources, 99% of the time anyway..
Edited by dci on Thursday 18th May 22:44
ambuletz said:
hypothetically speaking if you travelled to another country (or came back to this one) and you was over the limit on how much alcohol you could bring (lets say you brough 1 bottle of vodka too many), would you be allowed to have a chug of the excess bottle before they confiscate it?
do they take all bottles? ive always stayed within the limit.
They take it all. yes. I would be surprised to watch them take you to town over "one bottle too many" of Vodka. They could ask you to pay the duty but if you refused you'd lose it all.do they take all bottles? ive always stayed within the limit.
But I have seen many many people lose entire suitcases filled with cigarettes, which are far more common for people to try and sneak in because of the much bigger price difference in them, especially from places like Tenerife.
I saw a video on FB of a cyclist on a down-hill stretch of road. He took his feet of the pedals and lay horizontally on the bike with his legs pointed straight out behind him. The idea was to reduce drag. The clip went on to show him in this low-drag mode (not pedaling, just coasting) overtaking cyclists who were in the conventional pose who were pedaling down the hill.
How realistic is is that all of the power (and more) of the pedaling cyclists is used up overcoming the difference in drag between a vertical and a horizontal rider?
How realistic is is that all of the power (and more) of the pedaling cyclists is used up overcoming the difference in drag between a vertical and a horizontal rider?
Ayahuasca said:
I saw a video on FB of a cyclist on a down-hill stretch of road. He took his feet of the pedals and lay horizontally on the bike with his legs pointed straight out behind him. The idea was to reduce drag. The clip went on to show him in this low-drag mode (not pedaling, just coasting) overtaking cyclists who were in the conventional pose who were pedaling down the hill.
How realistic is is that all of the power (and more) of the pedaling cyclists is used up overcoming the difference in drag between a vertical and a horizontal rider?
And, how much will it hurt when he inevitably hits a problem in the road surface and goes a over t? The thought of riding like that invokes something in me, something like when I think back to riding no-handed down a local hill, or climbing a really tall ladder. Aargh.How realistic is is that all of the power (and more) of the pedaling cyclists is used up overcoming the difference in drag between a vertical and a horizontal rider?
droopsnoot said:
Ayahuasca said:
I saw a video on FB of a cyclist on a down-hill stretch of road. He took his feet of the pedals and lay horizontally on the bike with his legs pointed straight out behind him. The idea was to reduce drag. The clip went on to show him in this low-drag mode (not pedaling, just coasting) overtaking cyclists who were in the conventional pose who were pedaling down the hill.
How realistic is is that all of the power (and more) of the pedaling cyclists is used up overcoming the difference in drag between a vertical and a horizontal rider?
And, how much will it hurt when he inevitably hits a problem in the road surface and goes a over t? The thought of riding like that invokes something in me, something like when I think back to riding no-handed down a local hill, or climbing a really tall ladder. Aargh.How realistic is is that all of the power (and more) of the pedaling cyclists is used up overcoming the difference in drag between a vertical and a horizontal rider?
https://www.youtube.com/watch?v=bvmibwafGXc
Staying, if I may, with the speed of light theme;
They say that some/most of the stars we see in the night sky are probably "dead" by now, because they're so far away and the light from them takes so long to get here, right?
So have we ever witnessed the "death" of a star? Like an astronomer is peering through his telescope at Alpha Gemini Kumquat 824B and then suddenly it goes out?
They say that some/most of the stars we see in the night sky are probably "dead" by now, because they're so far away and the light from them takes so long to get here, right?
So have we ever witnessed the "death" of a star? Like an astronomer is peering through his telescope at Alpha Gemini Kumquat 824B and then suddenly it goes out?
Drummond Baize said:
Staying, if I may, with the speed of light theme;
They say that some/most of the stars we see in the night sky are probably "dead" by now, because they're so far away and the light from them takes so long to get here, right?
So have we ever witnessed the "death" of a star? Like an astronomer is peering through his telescope at Alpha Gemini Kumquat 824B and then suddenly it goes out?
That's not how most stars end their lives - Google nova and supernova They say that some/most of the stars we see in the night sky are probably "dead" by now, because they're so far away and the light from them takes so long to get here, right?
So have we ever witnessed the "death" of a star? Like an astronomer is peering through his telescope at Alpha Gemini Kumquat 824B and then suddenly it goes out?
MartG said:
Drummond Baize said:
Staying, if I may, with the speed of light theme;
They say that some/most of the stars we see in the night sky are probably "dead" by now, because they're so far away and the light from them takes so long to get here, right?
So have we ever witnessed the "death" of a star? Like an astronomer is peering through his telescope at Alpha Gemini Kumquat 824B and then suddenly it goes out?
That's not how most stars end their lives - Google nova and supernova They say that some/most of the stars we see in the night sky are probably "dead" by now, because they're so far away and the light from them takes so long to get here, right?
So have we ever witnessed the "death" of a star? Like an astronomer is peering through his telescope at Alpha Gemini Kumquat 824B and then suddenly it goes out?
Drummond Baize said:
MartG said:
Drummond Baize said:
Staying, if I may, with the speed of light theme;
They say that some/most of the stars we see in the night sky are probably "dead" by now, because they're so far away and the light from them takes so long to get here, right?
So have we ever witnessed the "death" of a star? Like an astronomer is peering through his telescope at Alpha Gemini Kumquat 824B and then suddenly it goes out?
That's not how most stars end their lives - Google nova and supernova They say that some/most of the stars we see in the night sky are probably "dead" by now, because they're so far away and the light from them takes so long to get here, right?
So have we ever witnessed the "death" of a star? Like an astronomer is peering through his telescope at Alpha Gemini Kumquat 824B and then suddenly it goes out?
vonuber said:
Faith always beats proof, sadly.
That was my argument in work recently, friendly debate involving deeply religious Christian who doesn't force it in us and is probably the nicest bloke I've ever met but his belief that the end of days it can't be a nuclear apoloclypse it's something caused by god suggests faith not rationale.But I'd say my argument to anyone trying to dis[prove religion is that it's all bout faith (even though I'm an atheist) if I prove there's no god have I really disproved faith? Is it an unasnswerable question?
vonuber said:
briangriffin said:
Will it ever be possible to disprove God? If aliens landed yesterday and showed that sub human at Manchester arena that there's no such thing would he believe it or does 'faith' trump proof?
Faith always beats proof, sadly. It might be impossible to prove a negative, but proving that, should he exist, he doesn't care how you live your life seems fairly straight forward.
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