Why is an air bubble in your blood dangerous? |
- Why is an air bubble in your blood dangerous?
- Is there a rule of thumb for maximizing the magnetic field when making a solenoid?
- Is there a website where one can see the line spectra for every element?
- Why is lead so dense but so soft, aluminium so light but also soft, but then tungsten is very dense but incredibly hard and titanium is so light but also really hard?
- Can a charged metal object be accelerated with an electric field the same way rail guns use magnetic fields?
- What causes people to act different when drinking than when sober?
- Whats stopping us from using H2O electrolysis as energy storage for solar arrays?
- How have the nutritional value of crops such a wheat changed over the last 1000 years and why?
- Why does water put out fire?
- Why do teeth tend to revert towards their old alignment once you stop wearing braces?
- If I was to be in space next to Pluto, and my speed relative to the Sun was stopped, how long would it take me to fall into it and how fast would I be going?
- Why is flu fatal?
- How does climate change affect violence... and why is there seemingly more violence in hotter locations?
- Can sleeping in a draft cause you to become sick?
- Do we know why the mumps virus targets the parotid gland over any others?
- What causes certain types of brain tumors to affect children rather than adults?
- Do (Can we determine if) binary stars revolve in opposite directions?
- As an adult, is it possible to hook up your belly button again to an artificial 'umbilical cord' for life support like when you were in the womb?
- Can LIGO pinpoint the position of black hole collisions?
- What would an observer see when a distant object (such as a star) approached the speed of light?
- Would having a star which emits more radiation cause evolution to happen faster?
- GPS failure without relativity?
- When clown-fish change gender, what actually happens to them?
| Why is an air bubble in your blood dangerous? Posted: 23 Jun 2016 01:45 PM PDT |
| Is there a rule of thumb for maximizing the magnetic field when making a solenoid? Posted: 23 Jun 2016 04:17 PM PDT As a physicist I'm a bit embarrassed asking this, but this is something I've never "gotten." I know all about how to calculate the B-field in a solenoid, but in a practical sense I'm not sure how I would go about designing one if I want the most bang for my voltage source. For example, suppose I have a 12 V car battery (so I can max out at ~100A without running out of juice too fast). So the parameters I'm working with are: 12V, and up to 100A. That's 1200W which is a lot of heat to dissipate, but let's just ignore that factor completely. My question is: what gauge wire and how many turns should I use to most judiciously use my 12 V to generate the B field? Of course I want both high current and number of turns, but higher gauge wire will give you lower current for a given length and higher turn density, and higher gauge wire will give you lower current for a given length and higher turn density. Sure, I could go ahead and work it all out, making some really complicated formulas involving wire diameter as a function of gauge, resistance as a function of gauge and wire length, wire length as a function of solenoid thickness and length, and so on, but shouldn't there be a "solenoid-maker's rule of thumb" somewhere? After all, isn't this like, the most common calculation anyone would ever want to do regarding solenoids, so as to not waste electricity and build materials in getting the desired B-field? [link] [comments]  |
| Is there a website where one can see the line spectra for every element? Posted: 24 Jun 2016 05:19 AM PDT |
| Posted: 24 Jun 2016 05:43 AM PDT What's going on with the atoms that makes all these characteristics interchangeable? [link] [comments]  |
| Posted: 24 Jun 2016 04:48 AM PDT For example: if I had a ball bearing with a net charge, and it was held in a vacuum, could I push it along without touching it by using an increasingly strong electric field? And could I do the reverse, slowing it down? How efficient would this be, since it's frictionless? [link] [comments]  |
| What causes people to act different when drinking than when sober? Posted: 23 Jun 2016 12:25 PM PDT |
| Whats stopping us from using H2O electrolysis as energy storage for solar arrays? Posted: 23 Jun 2016 10:57 PM PDT I know that one of the bigger costs in solar energy is finding a way to store all the energy you gather during the day for later use, so my question is, why use batteries? Is it feasible to try and electrolyse water from the electricity created by your solar array, storing the oxygen and hydrogen gas to be used in the future via a voltaic cell setup to produce electricity for a household? As a bonus, these personal reservoirs could be used as fuel for a fuel cell vehicle theoretically. What do you think? Would it be feasible? Or is there some huge issue with it that im not aware of? [link] [comments]  |
| How have the nutritional value of crops such a wheat changed over the last 1000 years and why? Posted: 24 Jun 2016 06:25 AM PDT |
| Posted: 24 Jun 2016 06:22 AM PDT Okay...... you're probably reading the title and thinking it's a stupid question. but scientifically, why does it? fire is the product of combustion (most often), and in combustion, it forms water. so is it because of le'chattliers principle? [link] [comments]  |
| Why do teeth tend to revert towards their old alignment once you stop wearing braces? Posted: 24 Jun 2016 05:54 AM PDT As far as I'm aware, there is new growth of bone pertaining to the new alignment through bone remodeling. So what factors force the alveolar bone to go back to it's older configuration? [link] [comments]  |
| Posted: 23 Jun 2016 07:16 PM PDT If my speed relevant to the Sun was to be stopped completely, how long would it take for me to fall into the Sun because of gravity? [link] [comments]  |
| Posted: 24 Jun 2016 07:25 AM PDT Everyone gets the sniffles occasionally. So what makes the flu occasionally epidemic and more importantly deadly? (Spanish flu killed more than any disease in a single go!!) The internet says that flu suppresses the immune system and becomes fatal because of the prevailing condition such as asthma, kidney patients etc. It also says that children and the elderly are more prone. However, I remember (and later verified) a news report saying that the first victim of the Swine flu that hit in 2009 was a healthy young woman and so were the next few victims. So what is it exactly?? [link] [comments]  |
| Posted: 24 Jun 2016 07:24 AM PDT I wanted to get some good opinions on this article from people who know more about biology, sociology, and climate science. I lived in Ghana for a year and having lived in that heat, humidity, and lack of seasonal changes in temperature and sunlight, i have a personal interest in knowing if theres anything to the theories presented in this article. So...anyone can explain to me any other good reasons why there seems to be more violence in hotter locations?! Many thanks! [link] [comments]  |
| Can sleeping in a draft cause you to become sick? Posted: 24 Jun 2016 07:20 AM PDT I've heard the argument that being cold can depress your immune system and make you more likely to get sick. however when I google it, I find many popular science sources saying it's not true. I haven't been able to find any studies, and would greatly appreciate it if people could provide some evidence either way! [link] [comments]  |
| Do we know why the mumps virus targets the parotid gland over any others? Posted: 24 Jun 2016 03:24 AM PDT |
| What causes certain types of brain tumors to affect children rather than adults? Posted: 24 Jun 2016 07:02 AM PDT I've read about medulloblastomas affecting young children at a rate of 10x that of adults, and also that pilocytic astrocytoma is primarlily found in children. What causes this? Are the tumors very fast growing? Are they formed in embryo? Do they not follow the typical carcenogenesis route? And also, why does this phenomenon seem to be isolated to brain tumors? Why don't we see similar juvenile liver cancer? Or lung cancer? [link] [comments]  |
| Do (Can we determine if) binary stars revolve in opposite directions? Posted: 23 Jun 2016 04:34 PM PDT We are able to photograph Sol and see its sunspots traveling across its surface, indicating rotation. Do we have any way of determining the rotational direction of other stars? I've read the majority of stars are binaries. If they rotate in opposite directions, is it reasonable to suspect a mass traveled through the accretion cloud, when the stars were forming, causing two eddies, counter-rotating? [link] [comments]  |
| Posted: 24 Jun 2016 06:06 AM PDT Just wondering if the connections for life support are still inside your body or if they deteriorate as you grow up after birth. [link] [comments]  |
| Can LIGO pinpoint the position of black hole collisions? Posted: 24 Jun 2016 02:11 AM PDT With the possible news about LIGO and dark matter (Did LIGO detect dark matter?), I was led to wonder: When LIGO detects something like a black hole collision, is there any way to figure out where the collision happened? I know there are two detectors--are they far enough apart to do some kind of parallax computation? Would pinpointing the location give evidence for or against the primordial black hole hypothesis? [link] [comments]  |
| What would an observer see when a distant object (such as a star) approached the speed of light? Posted: 23 Jun 2016 05:14 PM PDT Would it appear frozen in time, or would its life cycle appear to speed up? Also would the rate of dark matter expansion accelerate to this speed? [link] [comments]  |
| Would having a star which emits more radiation cause evolution to happen faster? Posted: 23 Jun 2016 05:18 PM PDT |
| GPS failure without relativity? Posted: 23 Jun 2016 05:50 PM PDT So I understand that relativity has been proven time and again. I have a decent working knowledge of physics and understand time dilation (is that the right word?) based on relative velocity and proximity. But how would a lack of that understanding prevent my car from telling me where to go? I guess my question is more how does the Global positioning satellite system work with respect to relativity? I don't understand the necessity for the application of relativity at short distances and slow velocity (compared to ly and c). [link] [comments]  |
| When clown-fish change gender, what actually happens to them? Posted: 23 Jun 2016 07:55 AM PDT I recently heard that if a group of clown-fish is lacking a female, one of the males will change gender. What actually happens in their body, do they already have reproductive organs of both genders, or do they grow them when they change. Also what happens in their DNA, does it change? Thank you [link] [comments]  |
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