The second law of thermodynamics seems to clash with the Stefan-Boltzman law in the following example. How can they be reconciled? |
- The second law of thermodynamics seems to clash with the Stefan-Boltzman law in the following example. How can they be reconciled?
- A bluish aurora-like streak informally called "Steeve" has been recurrently spotted int the night sky of the Canadian prairies - what might it be, and how could this phenomenon be investigated?
- What is the difference between the negative gravitational potential energy shared among two objects and the negative energy theoretically required to create an Alcubierre drive?
- When moisturiser "sinks into" your skin, what actually happens?
- What is the mean temperature of ITER as a whole when running?
- Did primitive human groups have 'leaders'? And if so how were the 'leaders' decided?
- How does the nucleus in atoms stay together?
- What makes something radiation-proof?
- How does climate change cause the bleaching of the Great Barrier Reef?
- I read somewhere that the AC travels on the surface of a conductor and the DC travels through the entire volume of the conductor. Why does this happen?
- What are the general characteristics of different periods in Earth's geologic history (e.g., Permian)? What criteria are used to separate one period from another?
- If two quantum particles are "entangled" and one is moved a great distance away, will it still react accordingly when its partner is subjected to a change?
- Do cells of different body parts go through mitosis at different rates?
- How dp particles interact with the Higgs Field?
- What's happening in your brain when you experience deja vu?
- How did Tyco Brahe account for movement of Earth in his measurements?
- How can Venus Flytraps close on their pray without a nervous system or muscles?
- What is the effective actual brightness in relation to the human eye of planetary objects in the distant solar system? What I mean is: are photos of Saturn the brightness they are due to long exposures or would they actually be relatively dim objects due to their distance from the sun?
- I just learned that the Aral Sea no longer exists and is now mostly a desert. Are there, and what are other comparable "recent" drastic changes of physical geography or biomes?
- Does being in shape make you burn less calories during equivalent exercise?
- What is different between a piece of matter and a piece of antimatter?
- Why don't professional athletes suffer from hearing damage due to constantly performing in extremely loud environments?
| Posted: 26 Apr 2017 03:49 AM PDT The second law of thermodynamics tells us that thermal energy spontaneously flows from a hot reservoir to a cold reservoir. Thus, it follows that no set of lenses and mirrors built around the sun can heat the earth to a hotter temperature than TSun. On the other hand, the Stefan-Boltzmann law tells us that the power radiated from a back body is proportional to P~AT4. Now imagine you could engulf A1 T14 = A2 T24 Hence, since A1 < A2 it follows that T1 > T2. But that violates the second law of thermodynamics. Where did I go wrong? [link] [comments]  |
| Posted: 26 Apr 2017 05:46 AM PDT |
| Posted: 26 Apr 2017 04:30 AM PDT |
| When moisturiser "sinks into" your skin, what actually happens? Posted: 25 Apr 2017 06:01 AM PDT |
| What is the mean temperature of ITER as a whole when running? Posted: 26 Apr 2017 02:36 AM PDT I was wondering, given that the fusion reactor chamber contains hydrogen and stuff at millions of degrees, does this notably increase the temperature of the reactor as a whole? I mean, the reactor weighs about 5000 tons of steel, but it also has 0.5 gram hydrogen in its reaction chamber at 100,000,000 Kelvin, so I'm wondering what temperature would the whole reactor as a whole have. [link] [comments]  |
| Did primitive human groups have 'leaders'? And if so how were the 'leaders' decided? Posted: 25 Apr 2017 07:59 AM PDT Edit: By primitive I mean pre-civilization, like Neanderthal time. [link] [comments]  |
| How does the nucleus in atoms stay together? Posted: 25 Apr 2017 06:36 PM PDT Basically that, how do all the protons stay together when their electromagnetic fields should make them repel each other ? [link] [comments]  |
| What makes something radiation-proof? Posted: 25 Apr 2017 08:50 PM PDT |
| How does climate change cause the bleaching of the Great Barrier Reef? Posted: 25 Apr 2017 05:58 PM PDT I read an article recently claiming that, yet it didn't provide clear evidence or really explain how it does, may some one clarify for me please? [link] [comments]  |
| Posted: 25 Apr 2017 08:25 AM PDT |
| Posted: 25 Apr 2017 08:52 PM PDT |
| Posted: 25 Apr 2017 06:37 PM PDT I admit I'm not even sure the question makes sense (I never went further than earning my A in calculus-based physics), but here goes. In the midst of an argument with an acquaintance about whether modern physics research supports various nebulous and semi-spiritual claims he was making about the connectedness of the universe, the power of the collective conscious to manifest things in reality, etc., he brought up the concept of quantum entanglement. He assured me that two quantum particles could become connected in such a way that even if one was subsequently moved a great distance away, the two would continue to influence one another in experimentally measurable ways. The example he gave was "like you could flip one's spin or something and the other particle would mirror that change from halfway across the world." I told him laypeople like us often misunderstand the significance and real meaning of high-level research like he was describing and that I was SURE what he described is not how matter actually behaves. In fact, I told him if he could produce a reputable scholarly research article where that phenomenon had been observed, I would pay him $100. He first tried to send me the Wikipedia page about quantum entanglement, and when I rejected that, he sent a link to this article that admittedly goes over my head. So...do I owe him the money? If what he's claiming is true and changes to a particle in Chicago could influence the behavior of a particle in Paris, it will sort of revolutionize the way I see matter and our universe. I still won't accept the majority of his lofty claims, but this one would blow my mind. I'm totally willing to accept being wrong, but I am SO very much hoping that the more enlightened minds of the AskScience community will tell me that he is indeed misinterpreting this idea. Thanks for any insight you are able to provide! [link] [comments]  |
| Do cells of different body parts go through mitosis at different rates? Posted: 25 Apr 2017 07:11 PM PDT Maybe the best example I can think of is that I don't think it takes as long for a fingernail to grow 1 cm as it does a 1 cm wide wide to heal. [link] [comments]  |
| How dp particles interact with the Higgs Field? Posted: 26 Apr 2017 12:08 AM PDT I am a 3rd year physics undergraduate doing research and a presentation on the ATLAS and CMS detectors at the LHC. I have done some reading on various CERN websites but I need some gaps filled in: I've taken introductory modern physics but have yet to take QM or EM courses. So far I seem to understand that this non-zero field in a vacuum is similiar to the elecrromagmetic field, but instead is able to apply mass to fermions, bosons, etc. which interact with the field, but I'm not exactly sure why this happens? What process selects which particles have mass and which do not? I may have more questions to follow, but let's start with this. P.S. I'm posting on mobile before I fall asleep at my desk, I apologize in advance for any grammatical / formatting errors. Title edit: How *do particles interact with the Higgs Field? [link] [comments]  |
| What's happening in your brain when you experience deja vu? Posted: 25 Apr 2017 10:55 AM PDT |
| How did Tyco Brahe account for movement of Earth in his measurements? Posted: 25 Apr 2017 10:47 PM PDT If Earth did not rotate, it would be comparitively simple to face the same direction every time for each measurement, and mark the position of an orbiting object. But Earth rotates as well as orbits. How did Tyco account for all of this? Also, how could he tell objects were moving in an elliptical orbit? [link] [comments]  |
| How can Venus Flytraps close on their pray without a nervous system or muscles? Posted: 25 Apr 2017 11:26 AM PDT |
| Posted: 25 Apr 2017 11:21 AM PDT |
| Posted: 25 Apr 2017 10:06 AM PDT Link to wikipedia article here. I'm a bit surprised I didn't hear of this before, since it seems like a perfect example of human-caused climate change. I'm also aware that many dams will create sizeable lakes, but this seems like it would be much smaller than the disappearance of the Aral sea. [link] [comments]  |
| Does being in shape make you burn less calories during equivalent exercise? Posted: 25 Apr 2017 12:09 PM PDT This is an odd question, so bear with me. Assuming everything else was kept the same, would one person who was in shape burn the same amount of calories as someone who is out of shape? For example, if someone had the same bodily dimensions as someone else, and they both ran a mile, at the same exact pace, they would be putting in the same amount of WORK, but not necessarily the same amount of effort. For example, someone who hasn't run in a while might have a more difficult time doing a 5k than someone who works out frequently, but do they necessarily burn more calories or not? [link] [comments]  |
| What is different between a piece of matter and a piece of antimatter? Posted: 25 Apr 2017 10:52 AM PDT What numbers and values change? And why is there not an anti-photon? [link] [comments]  |
| Posted: 25 Apr 2017 11:07 AM PDT Pro sporting events are very well documented as being so loud that they cause hearing loss among fans. It seems to me that, above all, the greatest danger would be to the athletes themselves, since they are at the center of attention for every match. Although it might not pose a big problem for sports with less frequent matches, such as NFL players or professional boxers, how is it that players in the NBA or NFL, with 82 game seasons, don't suffer hearing damage? [link] [comments]  |
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