What is the significance of 232 degrees Celsius? |
- What is the significance of 232 degrees Celsius?
- What are some negative feedback mechanisms influencing global temperatures?
- What if the Golbach conjecture get verified ?
- Is there a psychological reason we recognize happy/sad melodies, or is it just that we're used to the context?
- Could Black Holes be Entropy Recyclers?
- Why did Pangea break apart and the continents move away in such a manner as if they were "floating", without regard for what lies underneath the ocean?
- Why are the hyperbolic functions useful?
- How do bacteria and other unicellular organism solve the issue of shortening DNA/RNA after replication?
- Is there a limit to the number of planets that can exist within a solar system?
- So where does the energy from fusion come from?
- Will all steel and iron vehicles or objects rust throughout time even without water contact?
- What is mental energy, and why do depressed people have none of it?
- Does changing to renewable energy sources actually reduce carbon emissions?
- How much predictability is there in a quantum system? Is it theoretically possible for everything to be calculable? Are there any formulas for predicting quantum behavior with 100% accuracy?
- Can light move slower than the speed of light?
- Is there a measure of 'elasticity'/'rigidity' for how much massive objects warp space-time?
| What is the significance of 232 degrees Celsius? Posted: 19 Nov 2016 01:25 PM PST I often see it in aviation as the max normal operating cylinder head temperature consistent across different airplanes. I'm wondering why is this number so common. I think it has something to do with specific heat capacity of a certain metal but I could be wrong. Can anyone shed some light on this? [link] [comments]  |
| What are some negative feedback mechanisms influencing global temperatures? Posted: 19 Nov 2016 12:17 PM PST I often hear about positive feedback mechanisms that can push global temperatures towards the extremes. For example:
If the earth has experienced extreme temperatures in the past, what mechanisms allowed for the return of global temperatures to more moderate values? [link] [comments]  |
| What if the Golbach conjecture get verified ? Posted: 19 Nov 2016 03:03 PM PST
What would be its implications -in mathematics ? EDIT attempt : I am in the app, it's Goldbach. [link] [comments]  |
| Posted: 20 Nov 2016 04:28 AM PST |
| Could Black Holes be Entropy Recyclers? Posted: 19 Nov 2016 08:26 PM PST This is probably a stupid idea, but I'm in Chem II right now and just learned about entropy. On the molecular level, entropy increases with the number of microstates possible where a microstate is defined by the number of possible variations of speed, position, rotation, and vibration a set of molecules can have. So, for example, if you have ten molecules in a small container and release them into a big container, the number of possible states has increased for those molecules, as they can be in a much greater number of physical positions in the larger container than they could in the smaller. Thus entropy has increased. My text book concludes that as the number of molecules increases, as temp increases, and as volume increases, entropy increases because each of these attributes lead to more possibilities of position, direction of movement, spin, etc for the system to have (and thus more disorder). This made me think about black holes. Molecules are so dense in a black hole, that I'd imagine entropy decreases. They have practically zero ability to move anywhere, they're essentially in a smaller container with fewer possible physical locations for them to be in, and in general they're more highly organized. So how stupid of an idea is this? [link] [comments]  |
| Posted: 19 Nov 2016 11:58 PM PST Why did Pangea break apart and the continents move away in such a manner as if they were "floating", without regard for what lies underneath the ocean? What does this process look like if the oceans are removed? Why do the portions above sea level seem to remain largely unchanged if the plates are being driven together, underneath and above one another? [link] [comments]  |
| Why are the hyperbolic functions useful? Posted: 20 Nov 2016 06:56 AM PST It is easy for me to understand how and why sine and cosine are useful. They describe oscillatory motion, and so they are used to model periodic phenomena (waves, harmonic oscillators, sunlight intensity, temperature variations, etc.). My understanding is that they derive their usefulness at least partially from the fact that their values correspond to the (x,y)-coordinates of points on a circle. Why are the hyperbolic functions useful? Whence do they derive their usefulness? [link] [comments]  |
| Posted: 20 Nov 2016 04:05 AM PST Sorry if this sounds silly, and I'm probably mistaking the issue of the telomeres here, so I apologise if this' a stupid question. Wouldn't the genomes in bacteria grow smaller every time there's replication process? Or do bacteria have other ways to ensure proper replication of their nucleotide sequences? [link] [comments]  |
| Is there a limit to the number of planets that can exist within a solar system? Posted: 19 Nov 2016 08:25 AM PST I was looking through this wikipedia list of multiplanetary systems and noticed that our system seems to have the most at 8. I was wondering if there is any universal limit to the number of planets that can exist within a solar system. [link] [comments]  |
| So where does the energy from fusion come from? Posted: 19 Nov 2016 09:27 AM PST If a deuterium nucleus and a tritium nucleus fuse and create helium-4 and a neutron where is the mass difference that as I have understood is turned into energy? Isn't the mass of tritium + deuterium the same as helium-4 and one neutron? [link] [comments]  |
| Will all steel and iron vehicles or objects rust throughout time even without water contact? Posted: 19 Nov 2016 01:41 PM PST Say a truck is in a garage and is left to sit there for centuries, will it rust? I am aware that some things will rust easier than others due to the metal, such as aluminum is harder to rust when in contact with water. [link] [comments]  |
| What is mental energy, and why do depressed people have none of it? Posted: 19 Nov 2016 05:58 PM PST It's a very real thing - people just crashing after hours of challenging mental tasks. But why should mental energy be a finite resource? Physical I understand, but is there a similar biological process that determines how much focus and mental energy someone has at any given moment? [link] [comments]  |
| Does changing to renewable energy sources actually reduce carbon emissions? Posted: 20 Nov 2016 12:47 AM PST This is an honest question. Because renewable energy costs more per kWh, manufacturing in places like Australia and the USA becomes less competitive. With many businesses shutting down or moving overseas to China, where emissions are less restricted, is this just shifting the problem elsewhere? Are there any studies on this? Could nuclear fission be considered more environmentally friendly than renewables as it doesn't cause the same displacement of industry? [link] [comments]  |
| Posted: 19 Nov 2016 09:48 AM PST |
| Can light move slower than the speed of light? Posted: 19 Nov 2016 09:24 AM PST I just read the /r/science thread about the new EM drive and someone said that light slowed down when it moved through cosmic clouds: link ...which seemed weird to me because I thought that the speed of light is static and can't be changed. I searched a bit and found this and this. Now I am confused and would appreciate any answer on the topic. [link] [comments]  |
| Is there a measure of 'elasticity'/'rigidity' for how much massive objects warp space-time? Posted: 19 Nov 2016 05:20 PM PST It's pretty common to use pictures such as these to represent gravity as something that is warping space-time. Using the analogy of a trampoline for example, we would expect a very heavy object to create a bigger dimple in the trampoline. However, trampolines may have different elasticities. A massive object may create a bigger dimple on one trampoline than another. I would imagine that this would be a result of the elasticity of the material/how rigid the material is. (You wouldn't expect a 1 kg ball to depress a concrete brick at all, but it would depress, for example, a water mattress). Given the analogy between objects on a trampoline and massive objects in space "depressing" space-time, is there a similar analogy between the rigidity/elasticity of the surface of a trampoline and the rigidity/elasticity of space-time? What does this rigidity mean? Is it a universal constant? [link] [comments]  |
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