Is there a relation between the spherical shape of bubbles and objects such as planets, stars, etc. that have reached Hydrostatic Equilibrium? |
- Is there a relation between the spherical shape of bubbles and objects such as planets, stars, etc. that have reached Hydrostatic Equilibrium?
- How exactly do Holograms work? How does the light emitted from the machine stop mid-air to create the images?
- Why do russian RD-180 engines run oxygen rich?
- How does the chemical reaction in glow sticks work?
- How does the myosin and actin crossbridge cycle work?
- If lightning is an electric current, made of electrons, what happens to the positive ions those electrons left behind?
- Why does public transportation typically not have any seatbelts?
- How were maps made before satellites and aeroplanes?
- When a new human being is created how do the cells know they need to develop organs like the brain in our bodies?
- Why are IgA antibodies found in serum 2x more than IgG, even though IgG accounts for more than 80% in the body?
- Why are halogens used as disinfectants? How does their structure contribute to their ability to disinfect better than other elements?
- [Astronomy]What's the minimum size a meteor would have to be to penetrate the atmosphere and strike the surface with enough force to make a crater?
- Why does tetanus almost always cause lockjaw before any other symptom?
- How is it that Jupiter can keep earth safe when they orbit the sun differently?
- How does a fighter jet know when it's being locked-onto by a seeker missile?
- How big would a building, like a large dome, have to be to have an internal weather system?
- Does the way food looks and smells influence taste? If so how does that work?
- What factors influence metastatic spread of a malignant tumour, other than venous drainage?
- Do the chemicals produced during REM sleep have any application for "full dive" virtual reality?
| Posted: 27 Apr 2018 11:15 AM PDT |
| Posted: 28 Apr 2018 04:28 AM PDT I saw this post and it reminded me of a question I've always had about this. [link] [comments]  |
| Why do russian RD-180 engines run oxygen rich? Posted: 28 Apr 2018 07:01 AM PDT As far as I know, every other rocket engine in existence favours fuel-rich operation. I know efficiency is inversely proportional to molar mass, and oxygen is lighter than RP-1, so is that the main reason why ther RD-180 is such a good engine? If so, what made it possible to run it oxygen rich and what prevented the US from developing the same engine? [link] [comments]  |
| How does the chemical reaction in glow sticks work? Posted: 28 Apr 2018 12:40 AM PDT |
| How does the myosin and actin crossbridge cycle work? Posted: 28 Apr 2018 06:40 AM PDT I don't get the role of ATP in this. It's so confusing. Each source says different things. Are there any good animations for this? Could you please explain what ATP does at each part in the cycle? ty [link] [comments]  |
| Posted: 28 Apr 2018 12:54 AM PDT I'm assuming the matter it comes from is water vapor in clouds. I may be mistaken about how that works. I might be wayyy off base about how that works but I'm fine with sounding stupid. Also, another question. Ionization is a chemical change, isn't it? So wouldn't whatever caused the matter in clouds (again, assuming water vapor) to ionize have to be a chemical reaction rather than a physical one? I believe I've read that the leading theory is that it comes from the motion of the water vapor "knocking off" electrons. That doesn't seem possible to me without a LOT of energy in the vapor. Do the atoms/molecules in clouds really move that fast? Or is something else at work here? [link] [comments]  |
| Why does public transportation typically not have any seatbelts? Posted: 27 Apr 2018 06:42 PM PDT I've taken buses in big cities across the EU, Middle East and North America, none have ever had seatbelts of any kind. Why is this? I assume that buses are no less likely to get into accidents, and would even assume that bus accidents would be more fatal due to the atypical seat layout (levels, rotated seats, etc...). So what's reasoning behind them not having any kind of seat belts? Surely it's just not an issue of inconvenience? On that same note, tramways (streetcars) also don't seem to have any seatbelts. [link] [comments]  |
| How were maps made before satellites and aeroplanes? Posted: 27 Apr 2018 06:05 PM PDT |
| Posted: 27 Apr 2018 02:31 PM PDT |
| Posted: 27 Apr 2018 10:26 PM PDT |
| Posted: 27 Apr 2018 10:00 PM PDT |
| Posted: 27 Apr 2018 12:35 PM PDT As I understand it, dust-sized meteors vaporize in the atmosphere, and large ones frequently explode in flight showering the ground with fragments. Some meteors essentially hit the atmosphere and stop, or at least go from cosmic speeds to near zero, then falling passively to the surface. So how large does a meteor have to be to survive the atmosphere more or less intact, and hit with enough force to make a crater? How large would this "minimum" size crater be? [link] [comments]  |
| Why does tetanus almost always cause lockjaw before any other symptom? Posted: 27 Apr 2018 02:48 PM PDT |
| How is it that Jupiter can keep earth safe when they orbit the sun differently? Posted: 27 Apr 2018 06:33 PM PDT |
| How does a fighter jet know when it's being locked-onto by a seeker missile? Posted: 27 Apr 2018 10:23 AM PDT In movies you always hear beeping in the cockpit to indicate that you're being targeted. Assuming this is a real thing, how does the aircraft detect that? Is it looking for certain infrared frequencies or something? [link] [comments]  |
| How big would a building, like a large dome, have to be to have an internal weather system? Posted: 27 Apr 2018 01:44 PM PDT |
| Does the way food looks and smells influence taste? If so how does that work? Posted: 27 Apr 2018 05:07 PM PDT |
| What factors influence metastatic spread of a malignant tumour, other than venous drainage? Posted: 27 Apr 2018 03:03 PM PDT So for example, are there any particular types of cells that are more likely to metastasise and take hold in the brain as opposed to the lungs? Does the cell lineage (e.g. epithelial vs mesenchymal) have any effect? [link] [comments]  |
| Do the chemicals produced during REM sleep have any application for "full dive" virtual reality? Posted: 27 Apr 2018 11:57 AM PDT I'm talking specifically about the ones released to keep your body from moving while you're dreaming. Also, if you've read any articles about this topic, I'd love to read them as well. [link] [comments]  |
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