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Everything posted by pzkpfw
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what if the angles on a triangle DIDN'T add up to 180*?
pzkpfw replied to CreeperCaleb's topic in Mathematics
Where it would be, is non-flat space. Edit: snap -
Introducing Edge theory. It's like String theory, except...
pzkpfw replied to NeptuneSeven's topic in Speculations
Did they pay you, or did you pay them? Who reviewed it? -
(For what it's worth, in English I've only ever heard "nickname", not "nick". YMMV.)
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That's also how you ended your last thread on this topic. Nobody is disturbed. I remember many many years ago at school, sitting on the step of a building watching someone about 150m away bouncing a basketball on the footpath. Thanks to the brick wall of the building they were outside, I was also hearing the ball hit the concrete. They stopped bouncing the ball. And I heard one more bounce. Slightly jarring at first. The distance was such that (like watching a movie where they sync up visuals and sound and ignore reality) I was seeing and hearing the bounce at the "same time", but of course the sound of each bounce was getting to me later than the sight. None of this is new.
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Did the Universe exist before brains?
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May someone please find the golden ratio of IQ?
pzkpfw replied to HawkII's topic in Analysis and Calculus
I don't know about that, but if we treat 55 and 145 as lengths in metres, you could fit 450 average bananas between them. -
can someone please criticize my idea about my decision in this regard?
pzkpfw replied to ahmet's topic in Engineering
Do authors pay to be published by them? -
Is print the double edged sword that dangles by a thread?
pzkpfw replied to dimreepr's topic in General Philosophy
Web forums are more dangerous than the printed word, I'd say. -
Nothing that big would have stayed secret. https://en.wikipedia.org/wiki/Atomic_spies
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Trying to build a small motor driven car, problems with motors and wheels
pzkpfw replied to paulsutton's topic in Engineering
Can you use pipeclamps and bolts? Glue is pretty one-way. (Though drilling polycarbonate sheet for bolt holes can be tricky.) -
I really need your help with some calculations
pzkpfw replied to tmdarkmatter's topic in Astronomy and Cosmology
As a rule of thumb (i.e. close enough), you'd block Proxima Centauri from all viewers on Earth at the same time with a disk the diameter of Earth, if the disk is next to Earth, or the diameter of Proxima Centauri if the disk is next to that star. Anywhere in between would be a ratio. (Give or take a little gravitational lensing, and assuming everything stays still ... etc ...) -
Can you suing POstScript to make an animation?
pzkpfw replied to PeterBushMan's topic in Computer Science
Did you abandon your previous thread? I'm assuming (not "suing"!) you mean JavaScript not POstScript here, too. JavaScript has no sleep. The idea of blocking code in something built for the UI is an anathema. However, you can fake it. The following works. It wraps the setTimeout in a promise, then uses await to block on it. <html> <head><title>Not a great general purpose programming environment</title></head> <body> <script> ShowLine("You can't always get what you want."); function sleep(ms = 0) { return new Promise(resolve => setTimeout(resolve, ms)); } async function ShowLine(input) { for (let i = 0; i < input.length; i++) { await sleep(250); document.write(input[i]); }; } </script> </body> </html> It seems to me you're really needing something else to do your programming with. (But you don't provide much detail to work with.)- 1 reply
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How to make this simple javascript code work?
pzkpfw replied to PeterBushMan's topic in Computer Science
setTimeout is async, i.e. it's non-blocking and will never work like this. The for loop would race ahead and make 100 setTimeouts all at once, then they'd all fire at more or less the same time, not 100 ms after each other. Also, Endy0816 is right that the null cannot be used. You do need to call a function, or have a string that evaluates to code, or use a lambda (arrow function). This works: <html> <head></head> <body> <p>Test:</p> <script> let i = 100; setTimeout(ShowDot, 100); function ShowDot() { document.write("."); if (i-- > 1) { setTimeout(ShowDot, 100); } } </script> </body> </html> If you want the first dot to show immediately, just replace the first: setTimeout(ShowDot, 100); With: ShowDot(); See: https://developer.mozilla.org/en-US/docs/Web/API/setTimeout -
Fluctuating magnetic fields cause heart attacks and strokes to double!
pzkpfw replied to LaraKnowles's topic in Physics
Don't you already have a thread on this stuff over in Medical Science | Anatomy, Physiology and Neuroscience ? -
This sounds like homework.
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It's just sloppy language. From the point of view of a person anchored to the ground, another person might appear to lift in this scenario. But it's not lift, it's more that the ground is "falling away from" the un-anchored person, and they continue to move as they did.
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Occams' razor suggests that bigfoot isn't people wearing bigfoot costumes, it's bigfoot hiding by wearing black bear costumes.
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If new physics is required, how do you then answer the question in post #1 ?
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Pareidolia https://en.wikipedia.org/wiki/Pareidolia
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From this post, it looks like you don't actually know the big bang theory. It might be good to start with understanding current science, before deciding it's wrong.
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Mostly I really hate time travel in any show. I generally can excuse one or two bits of magic in something (e.g. faster than light travel is pretty much required to make most Science Fiction work), but the implications of time travel are just too much for me. Having said that, I recently watched Eureka. Pretty much all of the science in that show was just silly. But that then made it easier to accept the time travel episodes. It was all really just fantasy. And the interesting bit of the time travel was that they kept the "timeline changes" in the show. That is, around half way through the run they altered their present by something they changed in the past ... never reverted it. So some characters went on in the show knowing about the "other timeline" and others only knew one. It was like the show was rebooted, with some characters knowing about the reboot.
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Entanglement can be demonstrated by measuring the spin of a photon
pzkpfw replied to Paulsrocket's topic in Speculations
I see we can add probability to the list of things you don't (can't?) understand. -
There's also an element of "lies to children". The average person doesn't need a completely scientifically accurate explanation of something to the smallest detail. They just need to know "enough". Like the friend of mine in college (= US high school) who put his motorcycle gloves in a microwave to "dry" them, and hurt his hands when he put them on. It's like the difference between "education" by pop-sci youtube videos, vs University.
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Entanglement can be demonstrated by measuring the spin of a photon
pzkpfw replied to Paulsrocket's topic in Speculations
I think we need to explain "you can't have your cake and eat it too". Back on page 1 swansont told you "One way is to send it through a polarizing beam-splitter cube. If the polarization is in one direction it goes straight through. If it’s orthogonal it gets reflected. Knowing which way it goes tells you the polarization " So you have detectors at different locations, corresponding to the outputs of the beam-splitter cube. Which detector detects the photon tells you the spin that that photon had.