If you put a giant mirror on the floor of the earth and make a photo from a satelite, what would you be able to see? |
- If you put a giant mirror on the floor of the earth and make a photo from a satelite, what would you be able to see?
- What makes a metal an ohmic conductor or a non-ohmic one?
- AskScience AMA Series: I am Dr. Nina Kraus and will talk about how music and concussion impact brain health. Ask Me Anything!
- Is there such a thing as identical twins in the animal world outside of humans?
- From the modern definition of a second, how do we know that the transition time between the two hyperfine levels of the ground state of cesium 133 atom is a constant?
- Does the US government run scientific experiments to determine if policies work?
- Why do shockwaves make the shape they make?
- Raw eggs left in a glass of water produce white strings that are different sizes . What are they and what contributes to the size of strings?
- How did we calculate the age and lifespan of the universe?
- Why Electrons don’t collide with matter in Cherenkov Radiation?
- What exactly is renormalization, why was it long considered unsatisfactory and how was it eventually proven to be mathematically sound?
- What are the limiting factors for screen size?
- Is there a universe scaled coordination system like there is longitude/latitude on planet surfaces?
- Why do we use parsecs instead of 3.26 lightyears?
- How do we determine the force of an electromagnet?
- Do shadows have reflections? If a light from a window is shown on a mirror and bounces back to the wall in front of it that you see the light on the wall, can a shadow from a person do the same?
- How many weeks are really in a year?
- How do the laws of quantum mechanics apply to complex situations?
- Why do doctors hold our testicles and make us cough as part of a medical exam ?
- Why doesn't lava dry out within a volcano?
| Posted: 08 Mar 2019 12:57 AM PST In my class this came up in a discussion and we were unsure what the result would be.
Edit 1: Thanks for your answers. My conclusion of this would be, that the image of the mirror would be blue (if there is no sun in the frame) [link] [comments]  |
| What makes a metal an ohmic conductor or a non-ohmic one? Posted: 07 Mar 2019 03:42 PM PST I've learnt that metals like copper is ohmic while tungsten is non-ohmic, but is there a reason behind these properties? (Also, out of curiosity, are gold and silver also ohmic conductors?) [link] [comments]  |
| Posted: 08 Mar 2019 04:00 AM PST How do our experiences, such as learning how to play music and playing sports, affect our brain? Although we are surrounded by sound all of the time, we rarely give much thought to this invisible yet powerful companion. The auditory system is a uniquely complex sensory system and the ability to make sense of sound relies on exquisite precision by the brain. Given the complexity and precision of the auditory system, accurate sound processing is particularly vulnerable to head injury. On the other hand, its precision can be honed by activities that exercise the auditory brain such as playing a musical instrument. We have discovered a way to objectively capture the imprint that sounds leave on our brains. This biological approach empowers us to learn more and more about this invisible ally and enemy of brain health. Dr. Kraus will examine the promise of measuring soundprints in the brain to assess and manage sports-related concussions. She will discuss how music training is beneficial for the brain, strengthens our communication skills, and can inform health care, education, and social policy. Dr. Kraus will be here at 2:00 CT (3 ET, 19 UT). Ask her anything! Links:
articles: Kraus N, White-Schwoch T (2017) Neurobiology of everyday communication: what have we learned from music? *The Neuroscientist(. 23(3): 287-298. Kraus N, Nicol T (2017) The power of sound for brain health. Nature Human Behaviour. 1: 700-702 Kraus N, Thompson EC, Krizman J, Cook K, White-Schwoch T, LaBella CR (2016) Auditory biological marker of concussion in children. Nature: Scientific Reports. 6: 39009. [link] [comments]  |
| Is there such a thing as identical twins in the animal world outside of humans? Posted: 07 Mar 2019 05:44 PM PST |
| Posted: 08 Mar 2019 01:51 AM PST Have we found a ground basis for the definition of second that is completely reliable? Even if we were moving closer to the speed of light? What about exceptionally massive objects, could the space time distortion affect the time that it takes for the transition to occur? [link] [comments]  |
| Does the US government run scientific experiments to determine if policies work? Posted: 07 Mar 2019 08:08 PM PST |
| Why do shockwaves make the shape they make? Posted: 07 Mar 2019 11:52 PM PST So today in the newspaper was this article (https://www.abc.net.au/news/2019-03-08/nasa-captures-incredible-images-of-supersonic-shockwaves-intera/10882590) which shows shockwaves coming from aircraft at supersonic speeds. I understand that as the object approaches the speed of sound the bow waves in the air (themselves travelling at the speed of sound) get closer together, until they merge into a single big shockwave to create the sonic boom. Fine. But nevertheless each individual shockwave (or the sum of them), is still travelling outwards from individual points (https://en.wikipedia.org/wiki/Sonic_boom#/media/File:Dopplereffectsourcemovingrightatmach1.4.gif) in expanding circles. But the images in the newspaper article show the shockwaves coming off the front of the plane practically horizontally, rather than in a circular shape. It's as if somehow the air which is 20m to the left or right of the plane is being compressed by the front of the plane, even though the plane is only 1m "in front" of the spot being compressed. How can that be? Surely as the plane goes faster, the bow wave becomes more linear in shape, not more horizontal, no? [link] [comments]  |
| Posted: 08 Mar 2019 01:42 AM PST https://i.imgur.com/k8z9sQu.jpg I posted it on r/whatisthisthing and got destroyed. Answers given: "Protiens and fats solidifying as the water dissolves", "Convection currents" and "not all eggs are exactly the same". [link] [comments]  |
| How did we calculate the age and lifespan of the universe? Posted: 07 Mar 2019 07:21 PM PST We have an estimate of how old the universe is and when it will end. But how accurate are these numbers? Did we find the oldest star or celestial object and deduce that it existed since the start? Also, how do we know when the universe will end. Did we calculate the expansion rate? [link] [comments]  |
| Why Electrons don’t collide with matter in Cherenkov Radiation? Posted: 08 Mar 2019 07:43 AM PST I saw some video on youtube about the Cherenkov Radiation, and it explained very well except for one thing, why don't the electrons collide with the matter (water molecules or other electrons) and become slower than the speed of light in water or even at the same speed? [link] [comments]  |
| Posted: 07 Mar 2019 03:17 PM PST |
| What are the limiting factors for screen size? Posted: 07 Mar 2019 09:30 PM PST When you see massive displays over 80,90,100" they are often compromised of several smaller screens. Other than cost what factors, if any, limit how big a monitor can be and how does maximum size and limitations differ across different types of screens? [link] [comments]  |
| Is there a universe scaled coordination system like there is longitude/latitude on planet surfaces? Posted: 07 Mar 2019 07:29 PM PST This has been on my mind for a while. It all started when thinking about the concept of how we can pinpoint locations on earth with just latitude and longitude. simple enough. BUT then mind jumped to how I could relate that location to the sun....great, 3 dimensions. Beyond the dimension of time, I cant conceptualize one would pinpoint a location on earth in relation to the universe. The universe is moving, expanding, and perceptions of times vary throughout. Is there a universe oriented coordinate system that includes the various dimensions in play? [link] [comments]  |
| Why do we use parsecs instead of 3.26 lightyears? Posted: 07 Mar 2019 03:37 PM PST I just learned this in school so I know near nothing about parsecs, so sorry if the answer is obvious. I just don't see the reason to say parsecs instead of using lightyears everywhere, you know, using one word and not multiple ones would be less confusing. Or are there certain things you can only do with parsecs? [link] [comments]  |
| How do we determine the force of an electromagnet? Posted: 07 Mar 2019 09:23 PM PST How can we accurately determine a pull force of an electromagnet? Say I have one of those Junkyard magnet that is use to lift cars and such, and have a certain amount of current running through it how do I calculate the maximum force that the electromagnet can pull? [link] [comments]  |
| Posted: 08 Mar 2019 02:39 AM PST |
| How many weeks are really in a year? Posted: 07 Mar 2019 08:53 PM PST We're told: 365 days in a year, 52 weeks in year, 7 days in a week. But... 365 days / 7 days in a week = 52.14285 weeks per year Is it just common for us to round down to 52 weeks in a year? From what I understand, this is not why we have a leap year but I could be mistaken. Can anyone explain this a little better? This actually came up in an animal nutrition class when calculating costs. Edit: after reading my post maybe I am asking the wrong question. Maybe it would be better to ask what happens to the .14285 in the grand scheme of things? [link] [comments]  |
| How do the laws of quantum mechanics apply to complex situations? Posted: 08 Mar 2019 12:27 AM PST I have recently taken up reading on Quantum Mechanics and one confusing paradigm I came across was that according to a theory in Quantum Mechanics (please correct me if I'm wrong), what we see and perceive is what our brains make us see and perceive. This includes the people around us, and everything else. One dilema I have been facing is if for example, I perceive a specific person or a thing, then why does everyone else perceive the same things and in the same manner as I do? Shouldn't everyone have their own different and exclusive perceivable objects and persons? Is there a intermingling theory that I'm missing out? I am just at the tip of the iceberg of quantum mechanics so there might be a very simple explanation to this. Spare me if this is a very dumb question. [link] [comments]  |
| Why do doctors hold our testicles and make us cough as part of a medical exam ? Posted: 07 Mar 2019 01:52 PM PST |
| Why doesn't lava dry out within a volcano? Posted: 07 Mar 2019 09:16 PM PST Is lava/magma consistently being produced so that this doesn't occur? If it doesn't dry out, what keeps it heated within a volcano? [link] [comments]  |
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