- When I hold two fingers together and look through the narrow slit between fingers I am able to see multiple dark bands in the space of the slit. I read once long ago that this demonstrates the wavelength of light. Is there any truth to this? If not, what causes those dark bands?
- Can cold welding, like when two pieces of metal touch in space, be achieved on earth in a vacuum chamber?
- An average tennis ball floats in the centre of a hollow sphere made of extremely dense material, floating in space. Is the tennis ball "squeezed" by the sphere's "gravity well" toward the centre, or pulled outward by the gravity of the walls all around?
- Would it be easier to build a space elevator on the moon than on earth?
- If a spacecraft somehow accelerates from a space station to 0.995c (relative to the space station), and the spacecraft shoots an electron beam (not light) going 0.990c at the space station, then would this electron beam ever reach the space station?
- Does an 8-hour sleep from 3-11 AM different from an 8-hour sleep from 10 - 6 AM?
- How does timedependence of thixotropy work?
- How does STD Transmission work?
- What would happen to honey in high gravity?
- How many gamma rays is the average person exposed to on Earth?
- Is the multipole moment caused by quarks making up for example a neutron (which as a whole is neutral) a measurable effect? Could we use it to accelerate neutrons in an electric field?
- What is planck time ? Is there a slower ammount of time we can measure/calculate ?
- If planes are pressurized why do we have our ears popping?
- Why do you only hear the low frequencies when you're far away from a music performance?
- Why is electromagnetic wave not a longitudinal wave?
- Can you be "Star-burnt" at night? If so, how long would it take?
- What exactly would cause the air to be "sucked away" during an artillery shelling ?
- Why might some people be better able to see the colours of the auroras than others?
- Is it possible for bees to remember precisely where certain flowers are, and then return to them almost daily?
- Are people born on 23rd March more likely to be Olympic champions?
- How exactly do we know that the gravitational waves detected by LIGO were produced by the collision of two black holes?
| Posted: 20 Aug 2016 04:26 AM PDT |
| Posted: 19 Aug 2016 08:09 PM PDT Ive been reading about how cold welding can happen in the vacuum of space, but could it be achieved with a vacuum chamber on earth? [link] [comments]  |
| Posted: 20 Aug 2016 04:26 AM PDT In other words, if you have a hollow sphere made of, say, neutron star material, does the entire sphere make a single impression in spacetime - ie, gravity is highest at the centre of the sphere? Or, does spacetime mirror where the mass is, meaning gravity is highest the closer you are to the walls, and lowest in the middle of the sphere? [link] [comments]  |
| Would it be easier to build a space elevator on the moon than on earth? Posted: 20 Aug 2016 03:33 AM PDT It seems like this could be a way around some of the constraints involved in building an elevator such as finding new materials with the required strength. While you wouldn't be able to use it to ship resources off Earth it would be a great way to get water or raw materials for construction into space. And yet I never hear it talked about. Perhaps the slow rotation of the moon makes it more difficult... Thanks for any replies [link] [comments]  |
| Posted: 20 Aug 2016 05:58 AM PDT |
| Does an 8-hour sleep from 3-11 AM different from an 8-hour sleep from 10 - 6 AM? Posted: 19 Aug 2016 06:14 AM PDT My dad keeps on telling me "Your immune system is weak because you always sleep late." However, I get full sleep but on a different schedule than them. I sleep for more or less 8 hours but from around 3 am onward. Does it make a difference than sleeping early? [link] [comments]  |
| How does timedependence of thixotropy work? Posted: 20 Aug 2016 01:20 AM PDT I have a question about thixotropy. As far as my understanding goes. You apply a shear, and after a certain amount of time, you can observe this effect. The thing which i find confusing is, that it is classified as a nonlinear viscoelastic effect and what this implies. Nonlinear viscoelastic effect occur after a certain amount of deflection of some sort. So how does this work in detail. Do i have to apply a certain ammount of shear, and then the time is "ticking" when i apply further shear? I hope i made myself understandable, if not i will try to ask in a different way. [link] [comments]  |
| How does STD Transmission work? Posted: 19 Aug 2016 11:39 AM PDT In recent months, I've become curious about how STD's such as HIV, gonorrhea, herpes, etc are transmitted between partners. Withholding transmission mediums such as IV needles and the like, how does STD transmission occur during sex? More specifically, why are some STD's (such as HIV) more likely to be transmitted via (unprotected) penetrative sex than oral sex? My original intuition is that the infected bacteria only need to find an entry point into the body and at that point the person will become infected. Seemingly, this would make oral sex just as dangerous as penetrative sex. Obviously I am here to learn from individuals much smarter than myself so I look forward to your input. Thanks in advance. [link] [comments]  |
| What would happen to honey in high gravity? Posted: 19 Aug 2016 09:05 AM PDT I was wondering how would a liquid with higher viscosity react to a planet with higher gravity (like honey). Would it drizzle slowly? Or would it flow like water flows on Earth? [link] [comments]  |
| How many gamma rays is the average person exposed to on Earth? Posted: 19 Aug 2016 01:34 PM PDT |
| Posted: 19 Aug 2016 11:48 AM PDT |
| What is planck time ? Is there a slower ammount of time we can measure/calculate ? Posted: 19 Aug 2016 08:12 PM PDT |
| If planes are pressurized why do we have our ears popping? Posted: 19 Aug 2016 08:45 AM PDT I mean, there is supposed to be a constant pressure in the plane and the pressure is supposed to be independant of the outside pressure, so why do we have our ears popping when the plane is gaining altitude? [link] [comments]  |
| Why do you only hear the low frequencies when you're far away from a music performance? Posted: 19 Aug 2016 09:52 AM PDT I live about 2 km away from the city center, and if they're playing music I can always hear the lower tones quite well, while the higher notes apparently do no make the distance. Why is that? [link] [comments]  |
| Why is electromagnetic wave not a longitudinal wave? Posted: 19 Aug 2016 09:44 AM PDT Electromagnetic wave is not a longitunal wave. Why? Explain briefly [link] [comments]  |
| Can you be "Star-burnt" at night? If so, how long would it take? Posted: 19 Aug 2016 10:33 AM PDT The way I take it, the first question boils down to a few mechanisms: The first of which comes from photons emitted from the sun, absorbed and re-emitted by the moon. The second comes from photons emitted from distant stars other than our own sun. From my understanding, "sunburn" occurs when photons with energies in the band labelled UltraViolet interact with our skin. So, yeah, how does the re-emisson by the moon effect the energy of the photons? And what type of intensity of UltraViolet light do we normally see at the Earth's surface from distant stars? Thanks all :) edit: absorbed instead of reabsorbed [link] [comments]  |
| What exactly would cause the air to be "sucked away" during an artillery shelling ? Posted: 19 Aug 2016 10:33 AM PDT From the NY Times' "Fractured lands: how the arab world came apart" : [...] it meant shells passed directly over the Ibrahims' apartment building at all hours. "When they went overhead," Majd said, "it was like the air was sucked away. I don't know how else to describe it, but you felt it in your lungs. It was hard to breathe for maybe a half-minute afterward, like all the oxygen was gone." [link] [comments]  |
| Why might some people be better able to see the colours of the auroras than others? Posted: 19 Aug 2016 09:48 AM PDT I am aware that at lower latitudes than 50 degrees, it can be hard to see the auroras, and if you do see them I am told you may see them in black and white, because their light is too dim to be picked up by your eyes' cones (which perceive colour vividly) and instead your rods are doing most of the work. A camera does not have such constraints in its ability to "see", so it doesn't have this problem and can reveal the colours that you're failing to see. However, someone I know was lucky enough to go with his family to see the northern lights - he was unable to see the colours of the aurora, except in photos he was taking. My first thought was the explanation I provide above, but the other members of his family present were able to see the colours with a naked eye. He is not colour blind (as far as he knows, he has never had any issue distinguishing colours). What could be affecting his ability to see something that others could see so clearly? edit: I have categorised this as a human body question, because I feel like the answer is most probably down to a mechanical difference in biology, but appreciate the topic includes broader issues where other experts might have incidental knowledge, including physics and potentially astronomy! [link] [comments]  |
| Posted: 19 Aug 2016 10:40 AM PDT I am asking because I have been noticing some interesting activity. I live in a city highrise in the US. I'm on the 17th floor and have a few herb plants on my balcony. Ever since my basil began to flower I've been noticing bees have been arriving to pollinate. Frequently sitting near the window, and easily prone to distractions, I began to notice what seemed to be the same black and white bee, and the same (honey?) bee arriving everyday, separately. I'm obviously not positive that it is in fact, the same bees everyday; I only have a strong suspicion based on the fact that it's only ever one at a time, and there seems to be an alternate pattern between the black and white bee, and the honey (yellow one). Is it possible that it's the same two bees everyday? Thanks. [link] [comments]  |
| Are people born on 23rd March more likely to be Olympic champions? Posted: 19 Aug 2016 07:12 AM PDT In the UK, the BBC has reported that some of the most succesful Olympians were born on 23rd March. They include Jason Kenny, Mo Farah, Sir Steve Redgrave and Sir Chris Hoy. Apparently Roger Bannister shared the same birthday. Does your date, month of season of birth provide an advantage or could we pick any other day and find just as many sucessful people? [link] [comments]  |
| Posted: 19 Aug 2016 09:27 AM PDT |
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