If you point your phone camera at an IR LED (like in a TV remote) it is visible but why does it show up as blue/purple rather than red? |
- If you point your phone camera at an IR LED (like in a TV remote) it is visible but why does it show up as blue/purple rather than red?
- Where does the kinetic energy go here?
- What is the brigthest planet as seen from another planet?
- Why do tires on cars when doing a burnout give white smoke, but a pile of tires burns black?
- When a pair matter-antimatter is formed, why does it annihillates itself instead of just sticking together?
- Why are most all of the world's deserts sandy?
- Do 15 year old dogs get cancer at rates similar to 15 year old humans, or to humans at a similar point on their lifespan?
- How can we differentiate so many simultaneous sounds?
- What property of a charged particle causes the charge?
- Why do some species have such enormous individual variation while others look pretty much all the same?
- What would happen if someone was placed inside a giant hollow cube with gravity being exerted uniformly by all 6 walls?
- [Biology] What makes nucleic acids unique?
- Why does our tiny lump of rock that is Earth have so many different elements?
- Why do our pupils dilate when we get concussions?
- Is there any chance the Large Hadron Collider (LHC) poses any threat to the scientists who work with it, or at all to other humans and animals?
- Why do some smells (garlic, smoke, etc.) "stick" to skin/clothes more than others?
- Why did humans start wearing clothes?
- Would having a stronger core affect childbirth?
- How to calculate Bessel function and its constants?
- Do the constellations we see on Earth look the same from Mars?
- Since Chickenpox is a virus, doesn't stay in your system forever? If so, why don't children of adults who have had the virus immune to it?
- Why do English speakers pick up the accent of other English speakers if they're around them long enough, and does the same thing happen in other languages?
- Why is it that the range of any given force tends to be inversely proportional to the mass of the particle transmitting it?
| Posted: 25 Nov 2016 09:54 AM PST |
| Where does the kinetic energy go here? Posted: 26 Nov 2016 06:25 AM PST Imagine you and your buddy Neil Armstrong are in space. You both see a bunch of objects of different sizes and at different distances moving towards your direction, all of them around the same speed. From your frame you calculate the kinetic energy of all this particles. Then Neil pushes you while grabbing the spaceship, giving you the same speed and direction as this particles. From your new frame of reference all this stuff is standing still. The kinetic energy you can measure now is from the spaceship and from Neil which is less than the original. What happened with the energy? Where does it go? Or is energy relative? ...You then remember Neil has just double-crossed you and curse him at the top of your lounges while you descend into deep space [link] [comments]  |
| What is the brigthest planet as seen from another planet? Posted: 26 Nov 2016 03:14 AM PST I know that venus is the brigthest planet as seen from earth, but aside from the Sun and moons, can more brigth celestial objects be seen from other planets? I know few things that come into account when calculating this -Planets distance from the sun -Distance of planets between each other -Size of the planet -Reflectivesness of the planet -Possible relative allingments of the 2 planets and the Sun But its way above me to put all of them together. [link] [comments]  |
| Why do tires on cars when doing a burnout give white smoke, but a pile of tires burns black? Posted: 26 Nov 2016 04:47 AM PST |
| Posted: 26 Nov 2016 06:05 AM PST |
| Why are most all of the world's deserts sandy? Posted: 25 Nov 2016 09:25 PM PST Obviously when things like all of Antarctica are classified as a desert, not every single one is covered in sand. But I'm curious as to why this seems to be the case - or if this is even the case at all. [link] [comments]  |
| Posted: 26 Nov 2016 07:12 AM PST |
| How can we differentiate so many simultaneous sounds? Posted: 26 Nov 2016 07:11 AM PST So I understand that sound waves are vibrations in a medium; for example, a drum sends a wave of energy through the air that eventually vibrates the air molecules next to my ear drum, which is then translated into a recognisable sound by my brain, as opposed to actual air molecules next to the drum being moved all the way over to me. But if I'm listening to a band and all the instruments are vibrating that same extremely limited number of air molecules inside my ear canal, how is it that I can differentiate which sound is which? [link] [comments]  |
| What property of a charged particle causes the charge? Posted: 26 Nov 2016 06:54 AM PST In other words, what is charge? What causes us to say; "Well okay, an electron has a negative charge and a proton a positive charge." [link] [comments]  |
| Posted: 26 Nov 2016 06:01 AM PST Common Buzzards Buteo buteo for example have huge difference in colouring despite being the same species and subspecies, and there being no apparent geographic component to the variation. Two Buzzards in the same field can look so different a layperson wouldn't even think they're the same species. Yellow Wagtails Montacilla flava are known for having a large number of subspecies which all look different but are still considered the same species, here you can see that the different subspecies come from different places, indicating that the variation is a result of geographic distribution differences. In many cases it is possible to differentiate between a Yellow Wagtail from the Iberian peninsula from one from Italy from one from Sweden, for example, based on the way it looks alone. Osprey Pandion haliaetus however is one of the most widespread bird species in the world, but one from North America looks pretty much identical to one from Europe. What gives? [link] [comments]  |
| Posted: 26 Nov 2016 05:21 AM PST Would the uniform gravity from all sides of the cube cancel out and result in zero-gravity? Assuming that the experimenter is placed at the center of the cube, with the pull of gravity being equal from all sides. [link] [comments]  |
| [Biology] What makes nucleic acids unique? Posted: 25 Nov 2016 10:02 PM PST What makes nucleic acids so different from all other biomolecules? How have they evolved so differently from the rest of the biomolecules? [link] [comments]  |
| Why does our tiny lump of rock that is Earth have so many different elements? Posted: 26 Nov 2016 07:15 AM PST It seems so unlikely, that our planet, which in the grand scale of the Universe is so tiny, that there is some of every single known element present. Surely it would be much more likely for a planet to consist of a few core elements? Does our variety of elements say anything about how our planet may have formed? [link] [comments]  |
| Why do our pupils dilate when we get concussions? Posted: 26 Nov 2016 07:11 AM PST Is it evolutionary to let us know we have a concussion or is it a true symptom? [link] [comments]  |
| Posted: 25 Nov 2016 07:32 PM PST With the Large Hadron Collider being a powerful particle accelerator, is there any evidence of the scientists working on it suffering from any cancers or the like? Could those atoms being accelerated veer off course and escape from the LHC? [link] [comments]  |
| Why do some smells (garlic, smoke, etc.) "stick" to skin/clothes more than others? Posted: 26 Nov 2016 06:33 AM PST |
| Why did humans start wearing clothes? Posted: 26 Nov 2016 05:27 AM PST So I'm curious as to why humans evolved "out of" their fur and into clothes. [link] [comments]  |
| Would having a stronger core affect childbirth? Posted: 26 Nov 2016 05:27 AM PST Would having great core strength prior to becoming pregnant and then maintaining this strength (somewhat) ease childbirth/make it quicker/easier? [link] [comments]  |
| How to calculate Bessel function and its constants? Posted: 26 Nov 2016 04:23 AM PST My understanding is the equation y'' + 1/x y' +(m2 - a2 / x2 )y = 0 would have the solution y = C1 J1 (mx) + C2 j2 (mx) But how to determine the Bessel functions J1, J2 and their corresponding constants C1 and C2? Thank you!!!! [link] [comments]  |
| Do the constellations we see on Earth look the same from Mars? Posted: 25 Nov 2016 05:15 PM PST |
| Posted: 25 Nov 2016 11:30 PM PST I'm under the assumption almost everybody eventually get chickenpox, most during their younger years. But if your parents (or even just your mother) have had it, why aren't you immune to it? EDIT: "why AREN'T children of adults..." [link] [comments]  |
| Posted: 25 Nov 2016 10:51 PM PST |
| Posted: 25 Nov 2016 05:36 PM PST |
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