Discussion: Smarter Every Days newest YouTube video on Prince Rupert Drops VS Bullets! |
- Discussion: Smarter Every Days newest YouTube video on Prince Rupert Drops VS Bullets!
- AskScience AMA Series: I'm /u/OrbitalPete, a volcanologist who works on explosive eruptions, earthquakes, and underwater currents. Ask Me Anything!
- Is it possible to calculate the average chance of winning a 16x30 game of Minesweeper with 99 mines, assuming perfect play?
- Why does sublimation occur in some substances instead of melting?
- Will the antibodies from a blood donor attach to the antigens of the donation recipient?
- Is solar power effective in the Arctic summer?
- Does a stationary object "move through time" at the speed of light?
- Why is torque a vector? Right hand rule is a bit arbitrary isn't it? What does the direction of the torque vector signify?
- If time is affected by gravity then how can we measure light years accurately?
- Is it cheaper to turn your hot tub down or leave it at your ideal soaking temperature?
- Is there any reason why all the gas giants in our solar system formed in the outer solar system? Why didn't any gas giants form in the inner solar system?
- Do molecules with excited electrons act very differently (compared to the molecule in the ground state) in the presence of an electromagnetic field?
- Does every planet massive enough to support an atmosphere (e.g., as dense as Mars's) actually have one?
- What about the atomic/molecular structure of some material gives it a low or high specific heat?
- What is the farthest wind has traveled?
- How do animals evolve to have certain patterns on their body?
- Is there a way to convert Revolutions/Unit to Distance/Time?
- Why do allosterically regulated reactions have a large Gibbs free energy change compared to reactions regulated by phosphorylation?
- How does a polarizing filter work ?
| Discussion: Smarter Every Days newest YouTube video on Prince Rupert Drops VS Bullets! Posted: 29 Dec 2016 12:45 PM PST So you may have seen the Smarter Every Day video about Prince Rupert Drops but today Destin is doing something even neater. Prince Rupert Drops are so tough that even a hammer hitting them cannot break the glass. Destin finds out in this video if a bullet has enough force or if the drop will win. Destin(/u/MrPennyWhistle) will be here throughout the day to help answer your questions. [link] [comments]  |
| Posted: 30 Dec 2016 05:00 AM PST /u/OrbitalPete is a volcanologist based at a university in the UK. He got his PhD in 2010, and has since worked in several countries developing new lab techniques, experiments, and computer models. He specialises in using flume experiments to explore the behaviour of pyroclastic density currents from explosive eruptions, but has also worked on volcanic earthquakes, as well as research looking at submarine turbidity currents and how they relate to oil and gas exploration. He's watched volcanoes erupt, he's spent lots of time in the field digging up their deposits, and he's here to answer your questions (starting at 12 ET, 16 UT)! [link] [comments]  |
| Posted: 29 Dec 2016 09:21 AM PST I saw this frustrating windows Minesweeper picture on /r/gaming, and it got me thinking that it must be a statistical impossibility to maintain a 100% win rate, even with perfect play on that "expert" 16x30 grid of minesweeper with 99 mines. No matter how perfectly you play, some games will force you to occasionally have to make a guess, as is the case in the image that I linked too. If we can assume that we have a perfect player, who always makes the most highest probability selections (in other words, if there is a 100% "safe" square, it will always pick that before attempting to guess on a 50/50 safe square, and if there is a square that has a 2/3 chance of being safe, it will pick that before picking a square that has a 50/50 chance of being safe, then what would percentage of wins would the "perfect player" most likely approach? Other assumptions:
Thanks Reddit! [link] [comments]  |
| Why does sublimation occur in some substances instead of melting? Posted: 30 Dec 2016 06:24 AM PST What causes a material or element to skip a "stage" of matter and go immediately from a solid to a gaseous state? [link] [comments]  |
| Will the antibodies from a blood donor attach to the antigens of the donation recipient? Posted: 29 Dec 2016 12:12 PM PST I know that O- is the universal donor and that AB+ is the universal recipient because O- lacks major antigen groups while AB+ has the 3 major antigen groups. However, what still confuses me is why the antibodies received from the donor don't attach to the recipient's own blood cells. For example, if an O- person donates blood to an AB+ person, won't the antibodies from the O- donor attach to the RBCs of the AB+ recipient? Is this just a volume issue? Are there just not a large amount of antibodies present to attach to the recipient's cells? Thanks for any and all responses! [link] [comments]  |
| Is solar power effective in the Arctic summer? Posted: 30 Dec 2016 06:15 AM PST How much does the slant of the Earth affect the efficiency of Solar Power? Could we, for example, build solar plants in the Arctic to take advantage of 24/7 sunlight in the summer? Or does the reduced "strength" of the sunlight more than offset anything we gain from the increased duration of the light? [link] [comments]  |
| Does a stationary object "move through time" at the speed of light? Posted: 29 Dec 2016 07:56 PM PST I realize that doesn't make sense, as speed is dependent on time. But I am an amateur who has been playing with the various equations of relativity and trying to learn this in my spare time. I'm noticing that acceleration through space essentially dilates time as though you were merely "rotating" a unit of spacetime along a 4 dimension hypersphere(is that the right term?) axis, as opposed to accelerating in 4 dimensions. The length of a unit doesn't appear to change, but it's angle does? And if I'm extrapolating this correctly, then that is why we can never move at the speed of light through Space. It takes infinite energy to rotate the angle of the Space-line segment up to a 90 degrees away from a purely timelike direction, and even if we did, we would no longer experience the passage of time as we would now have 0 movement in the time axis. Is this understanding correct, or do I need to go back and reread this stuff? Sorry for explaining this in rudimentary terms without the actual scientific terms. I'm just trying to learn this from a mix of youtube videos and links to old physics documents and doing the math at home. [link] [comments]  |
| Posted: 29 Dec 2016 10:39 PM PST |
| If time is affected by gravity then how can we measure light years accurately? Posted: 29 Dec 2016 10:18 AM PST I'm not very knowledgable of and haven't studied physics or astronomy, so this is something I can't get my head around. Time is affected by gravity, right? So something with a strong gravitation pull (a planet?) is going to have slightly faster "time" than the "time" that is further away from the gravitational pull. And we measure light years by the amount of time it takes for light to travel from A to B. But if A and B have different gravitational strengths surrounding them, then how can we measure the exact amount of travel time? For some reason I feel like I'm missing something here. Also isn't light meant to be affected by gravity also? Thanks [link] [comments]  |
| Is it cheaper to turn your hot tub down or leave it at your ideal soaking temperature? Posted: 29 Dec 2016 04:31 PM PST A friend and I have a disagreement on this issue, I think he is wasting money turning his hot tub down to 87 every night and that he would save money by leaving it at 102, he dismisses the idea outright. I tried to do the math myself, here is what I came up with: Assumptions:
First we calculate the heat transfer rate at 102F and 87F respectively using R = kA(T1-T2)/d. We can assume the energy required to maintain the tub at a constant temperature is equal to the energy lost through the sides: Next we want to calculate the energy required to heat the tub from 87F to 102F, to do that we need to know the mass of water in the tub (preferably in grams). The energy required to heat the tub from 87 to 102 is then calculated using E = km(T1-T2). Now we can compare the two methods. The first method is running the tub constantly at 102F for time t. The second method is running the tub at 87 for time t and then heating it up to 102 when you are going to use it. Thus by my calculation, if he uses the tub more than once every two weeks he is losing money by turning it down to 87F. Can someone with a stronger engineering or physics background comment so that I can show him that I'm not completely full of it? Did I make any mistakes in my calculations? [link] [comments]  |
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| What about the atomic/molecular structure of some material gives it a low or high specific heat? Posted: 29 Dec 2016 08:10 PM PST |
| What is the farthest wind has traveled? Posted: 29 Dec 2016 07:29 AM PST |
| How do animals evolve to have certain patterns on their body? Posted: 29 Dec 2016 03:24 AM PST On the front page i saw an owl with fake eyes on the back of the head, as the feathers on the back of the head are of a different colour, resembling an eye. How did it evolve to have those specific patterns? [link] [comments]  |
| Is there a way to convert Revolutions/Unit to Distance/Time? Posted: 29 Dec 2016 07:58 AM PST For instance could something like a pulsar have the speed of its spin converted to mph? Can something spin fast than the speed of light? Edit: I probably should have used the word "rotation" instead. Im tired, sorry [link] [comments]  |
| Posted: 29 Dec 2016 11:03 AM PST In the glycolytic pathway, the 3 reactions that are allosterically regulated (Glucose to G6P, F6P to F-1,6,-BP, and PEP to Pyruvate) all have very negative gibbs free energy changes. Why is this the case for allosteric regulation and not for steps regulated by phosphorylation? EDIT: not glycolytic steps regulated by phosphorylation. First comment cleared it up any way. [link] [comments]  |
| How does a polarizing filter work ? Posted: 28 Dec 2016 11:14 PM PST |
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