- AskScience AMA Series: We are Dr. David Parrillo and Jeff Wooster from the Dow Packaging and Specialty Plastics business, here to sort out the facts from fiction on plastics packaging as it relates to sustainability, AMA!
- Is there an ultimate limit to the the amount of energy per flop in computation? In a perfect system, how little energy could power a 1 teraflop CPU using the limits of physics?
- Why are there random colorful dots/noise in videos shot in the space station?
- How much mass of hydrogen is fused in a hydrogen bomb explosion?
- If a chemical bond is broken and releases energy, then it must also be losing mass. What had been holding the mass?
- Can gravitational waves be used to signal from beyond a black hole's event horizon?
- What theoretically happens in the middle of two merging kerr black holes?
- If Multitasking is impossible, how do we walk and talk at the same time?
- Does oksusu cha have a high freezing temperature?
- How does light around a spinning black hole get a 'boost' despite there being a speed limit?
- Can't we avoid the "problem" of leap years by redefining what a second, minute, hour "means?"
- If passing the speed of sound in a vehicle produces a sonic boom, would something similar happen if you could pass the speed of light?
- How big was the universe 1 second after the Big Bang compared to now?
- Can you go faster than the speed of light by moving in opposite directions?
- Do black holes affect earths gravity?
- If I have a piece of string that is exactly 10 cm long, and I move it into a circle, it would mean that 10 cm = pi*diameter. Since the diameter can also be accurately measure, why can we not use this information to determine the exact value of pi?
| Posted: 16 Nov 2015 04:05 AM PST Hi Reddit! Innovation in plastic packaging has been driven by new materials development and enhancements in machine processing technology. The growth in flexible packaging is apparent in local super markets. In the US alone, the flexible packaging industry is worth roughly $31.1 billion. Significant innovations in material science (for example, advances in Polyethylene catalysis) have enabled new packages to be developed with multiple individual plastic layers that have the toughness, abuse properties, hermetic seal properties, barrier properties, and the shelf appeal to drive the conversion from high cost and high CO2 footprint materials to Plastic Packaging which enables a improved system sustainability. Ask Us Anything! We'll start responding to questions at 1:00 PM Eastern Time (10 am PT, 6 pm UTC.) David Parrillo: I am a PhD chemical engineer from the University of Pennsylvania and a Global R&D director at Dow. I am a member of the Materials Research Society Board of Directors, the External Advisory Board of Chemical Engineering at UC Santa Barbara, and a member of AIChE. I have more than 21 years of experience in the Chemical Process and Materials Industries driving product innovation in numerous market segments. I hold 13 US Patents and am the primary author on 20 peer review publications in the scientific literature. Jeff Wooster: I am a chemical engineer from Iowa State University and a global Sustainability director at Dow. In this role, I work with the entire value chain to drive the use of science and data-based decision making to improve the sustainability of plastic packaging value chains. As part of my effort to collaborate across the industry, I serve on the Board of Directors and as the president of AMERIPEN, a trade association founded on the principle that decisions should be based on scientific data and on the Board of Directors for GreenBlue, an environmental non-profit dedicated to improving sustainability. After spending the first 19 years of my career in R&D, I have spent the past 8 years focusing on sustainability. I hold 45 U.S. and foreign patents and have published more than 50 technical papers and presentations. [link] [69 comments]  |
| Posted: 15 Nov 2015 09:03 PM PST Would it be possible to get to 1 Tflop per watt? Is there a fundamental limit due to the laws of thermodynamics? Is there a fundamental link between computation, entropy and energy? [link] [16 comments]  |
| Why are there random colorful dots/noise in videos shot in the space station? Posted: 16 Nov 2015 01:51 AM PST |
| How much mass of hydrogen is fused in a hydrogen bomb explosion? Posted: 15 Nov 2015 05:13 PM PST The biggest yield fusion bomb tested is the Russian tsar bomba, at 50 megatons TNT. How much hydrogen actually fuses in a blast like this? [link] [7 comments]  |
| Posted: 16 Nov 2015 06:25 AM PST |
| Can gravitational waves be used to signal from beyond a black hole's event horizon? Posted: 15 Nov 2015 10:27 PM PST If the gravitational waves do exist, can they be used to communicate with somebody just inside a black hole, at least for a limited time? Matter and energy cannot pass back, but gravitational waves are just changes in the spacetime curvature, and spacetime is fundamentally continuious, so apparently nothing prevents changes in curvature originating inside event horizon from propagating outside. Or not? [link] [3 comments]  |
| What theoretically happens in the middle of two merging kerr black holes? Posted: 16 Nov 2015 05:20 AM PST Let me first specify what I mean by the question. Kerr black holes have an angular momentum and thus drag the infalling matter in the same direction of their spin right? Now let's assume that two exactly same kerr black holes just with their spin the opposite way are on a collision course with each other (as in they would directly hit each other instead of rotating around each other and eventually merge), what would happen the very instant their opposingly spinning event horizons touched? Could there be theoretically even an almost unmeasurable instant of time where their event horizons cancelled out and say a photon could escape even though it was initially doomed to fall into one the singularities? [link] [3 comments]  |
| If Multitasking is impossible, how do we walk and talk at the same time? Posted: 15 Nov 2015 03:20 PM PST Hi all, I've been told that multitasking is not actually possible. Instead, we switch between tasks. If this is true, how do we walk and talk at the same time? Or drive and listen to music? Are there any studies that support the existence of multitasking? [link] [10 comments]  |
| Does oksusu cha have a high freezing temperature? Posted: 15 Nov 2015 10:13 PM PST A while back, I made some oksusu cha (corn tea/tisane) in a large container, and some of it froze. Just recently, I poured some into a 2L soda bottle and it had some ice chunks when I pulled it out of the fridge (deep in the fridge I also had a separate cup of coffee that did not freeze, which leads me to think it has to do with the composition of the liquid). So I ask: what about the corn changes the freezing temperature of the beverage? [link] [4 comments]  |
| How does light around a spinning black hole get a 'boost' despite there being a speed limit? Posted: 15 Nov 2015 08:19 PM PST So I was reading Kip Thorne's "science of interstellar" and everything was making sense until I came across this image and he said that the light on the left side is going in the direction of the spin, which gains a boost which is why the side is flat, while the light coming towards us on the right side of the hole is going against the spin and thus falls in. I would understand this if light could go slower and faster than the speed of light but as I understand it, light cannot go slower than the speed of light, nothing massless can. So what is meant by light getting a boost? Shouldn't it fall in if it goes within the event horizon even if the hole is spinning? [link] [2 comments]  |
| Can't we avoid the "problem" of leap years by redefining what a second, minute, hour "means?" Posted: 15 Nov 2015 02:44 PM PST I understand the reasoning and physical reason for leap years, but, to me, it seems that the fact that there is an extra 1/4 or so day each year can be avoided by just redefining the length of time a second, minute, hour actually represent in order to make up for this fact. Currently, an international second is defined as "the duration of 9192631770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom" (whatever that means). Wouldn't lengthening this (and thus the length of a minute, hour, day, etc.) to make up for the 1/4 day left over at the end of each year get rid of the need for leap years? I understand that this may not be feasible in reality, I'm just wondering if there is some problem with my logic. [link] [9 comments]  |
| Posted: 15 Nov 2015 05:53 PM PST |
| How big was the universe 1 second after the Big Bang compared to now? Posted: 15 Nov 2015 09:51 AM PST |
| Can you go faster than the speed of light by moving in opposite directions? Posted: 15 Nov 2015 04:46 PM PST For example, if I wanted to send a beam of light from point A to point B, But they were both moving away from each other at 70% the speed of light, would that make it impossible for the beam to reach B, since in theory the combined speed of the points is over the speed of light? Or would it be okay since once I fire the beam (continuous), the light begins from that spot and is moving faster than point B, and can catch up to it, being 30% faster? [link] [1 comment]  |
| Do black holes affect earths gravity? Posted: 15 Nov 2015 01:34 PM PST |
| Posted: 15 Nov 2015 09:30 PM PST I would also like to add that I know measurements can be slightly off and not always perfect, so I'm asking the question in a completely theoretical sense. [link] [19 comments]  |
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