- Later this year, Cassini will crash into Saturn after its "Grand Finale" mission as to not contaminate Enceladus or Titan with Earth life. However, how will we overcome contamination once we send probes specifically for those moons?
- If friction causes particles to heat up, why do we use fans to blow air against ourselves to cool down, and how does that work?
- What should I even call this?
- How could the ITER infrastructure be used if the results are not the one people hoped for ?
- Does moving away from something at the speed of light create a still image?
- Do electrons have a directional orientation, or are they spherically symmetrical?
- Why does the Mars rover rely on Cleaning Events instead of having some sort of "windshield wipers" on the panels?
- Is today's Calvin & Hobbes word problem solvable?
- Does roadkill select for wildlife that is more wary of humans?
- How are asteroids detected? What are the chances we would even know if an asteroid that's big enough to wipe out all of humanity is on course to strike us?
- If the valence electrons are in orbitals, what are the non valence electrons doing? Do they have orbitals? What might they look like?
- Why is regression calculated as the square of the difference instead of the absolute?
- How serious can the earthquakes resulting from wastewater injection sites be?
- Could you see a rainbow using artfical light?
- How does a photovoltaic radiator (like the one found on the ISS) work?
- Is the Guanabana really this cancer curing fruit or is it all Dr. Oz type nonsense?
- Which transfers more heat to the mug, microwaving a 1/2 cup of water for a minute, or microwaving 1 cup for a minute?
- What are the pros/cons of feed forward and feedback control systems?
- In subsonic flow, why does flow speed up in a converging nozzle?
- Why are alpha particles always 2 protons and 2 neutrons?
| Posted: 23 Apr 2017 10:04 AM PDT |
| Posted: 24 Apr 2017 01:57 AM PDT |
| Posted: 24 Apr 2017 06:46 AM PDT Say a friend and I are standing on a planet with no mountains or canyons, totally flat. We stand on the equator and my friend holds an unbreakable string at one end. I take the other end and walk along the equator until I get back to him and he tensions the string and ties it together. Then he lets go. What would happen? Would the string hover off the ground or would it go slack and fall to the ground? [link] [comments]  |
| How could the ITER infrastructure be used if the results are not the one people hoped for ? Posted: 24 Apr 2017 02:44 AM PDT |
| Does moving away from something at the speed of light create a still image? Posted: 23 Apr 2017 06:03 PM PDT If you move away from something at the speed of light, then light can't catch up with you (correct?). Does this mean you see the same light that's in front of you over and over? Or does that light effectively disappear and you see nothing? [link] [comments]  |
| Do electrons have a directional orientation, or are they spherically symmetrical? Posted: 24 Apr 2017 01:18 AM PDT |
| Posted: 23 Apr 2017 02:39 PM PDT |
| Is today's Calvin & Hobbes word problem solvable? Posted: 24 Apr 2017 06:39 AM PDT Here is the link. I feel like there isn't enough information. Even if you assume the points are all on a line, there are at least two possible combinations that produce different answers: C-----------A-----B A-----B-----C Thanks! [link] [comments]  |
| Does roadkill select for wildlife that is more wary of humans? Posted: 23 Apr 2017 01:48 PM PDT |
| Posted: 23 Apr 2017 06:53 PM PDT |
| Posted: 23 Apr 2017 09:56 AM PDT |
| Why is regression calculated as the square of the difference instead of the absolute? Posted: 23 Apr 2017 09:25 AM PDT Is this decision arbitrary or is there something fundamental going on here? In a wider sense, I'm struggling with whether or not all of statistics is somewhat arbitrary and it something seeming to be useful is the reason things are calculated the way they are or whether things like the calculation of regression are settled on because of something more fundamental? [link] [comments]  |
| How serious can the earthquakes resulting from wastewater injection sites be? Posted: 23 Apr 2017 01:18 PM PDT |
| Could you see a rainbow using artfical light? Posted: 23 Apr 2017 07:43 PM PDT I heard it wasnt possible in a Flat Earth video and was wondering if the science checked out. So under controlled circumstances, Is it possible to see a rainbow (ark) useing an artifical light source if all the atmospheric conditions needed were met? [link] [comments]  |
| How does a photovoltaic radiator (like the one found on the ISS) work? Posted: 23 Apr 2017 02:29 PM PDT i.e what are the physics behind it, assuming I understand photovoltaic principles. [link] [comments]  |
| Is the Guanabana really this cancer curing fruit or is it all Dr. Oz type nonsense? Posted: 23 Apr 2017 10:43 AM PDT |
| Posted: 23 Apr 2017 10:17 AM PDT When I make coffee, I usually like to preheat the mug (to keep the coffee warm for longer) by filling it about halfway with water and microwaving it for a minute. This can usually raise the temperature of the water in the mug to about 85-90C, and the mug absorbs some of that heat. Would I be better off microwaving a full mug? The water's temperature would be far lower, which means a smaller heat gradient, but there would be more surface area for the heat transfer to occur. [link] [comments]  |
| What are the pros/cons of feed forward and feedback control systems? Posted: 23 Apr 2017 03:03 PM PDT |
| In subsonic flow, why does flow speed up in a converging nozzle? Posted: 23 Apr 2017 10:44 AM PDT I've heard the mass conservation/mass flow rate explanation and that makes sense to me. What I really want to hear is both a Newtonian and energy explanation. I know there is some sort of pressure differential that drives this acceleration because of F=ma. But why does this pressure differential exist? Since it's converging, I would expect the fluid to be getting denser and denser towards a decreasing cross-sectional area. This would cause the fluid to experience a higher pressure ahead of it than behind it because the molecules are colliding more and more frequently. From this I would expect the flow to slow down if anything. Also, the flow is speeding up so where is it getting the energy to do this? [link] [comments]  |
| Why are alpha particles always 2 protons and 2 neutrons? Posted: 23 Apr 2017 08:03 AM PDT As I understand, in terms of radioactivity, when an unstable nucleus undergoes alpha decay, a helium nucleus is always emitted. I was wondering why they do not emit other combinations of nucleons, for example 3 protons and 3 neutrons or 1p and 2n etc.. [link] [comments]  |
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