How is Plutonium 238 hot? |
- How is Plutonium 238 hot?
- Why do diamagnetic elements, such as Bismuth, not have a curie point above which they lose their diamagnetism?
- Do spectral lines appear in the microwaves, radio waves and x-rays, gamma rays as they do in visible light?
- What laws/theories limit the maximum size of a cyclone/anti-cyclone on a spherical body?
- What is energy?
- How do scientists know how many protons, neutrons and electrons there are in an atom?
- Where does "sound energy" goes, in active noise cancelling headphones ?
- Why does sound propagate faster through hot air eventhough it's less dense?
- What does the U on this magnet mean?
- When explaining the theory of relativity, the difference observed in passing time between a stationary observer and one who is moving is often used as a descriptor. How are stationary and moving defined?
- Do volcanoes form a shape that can be approximated by simple mathematical curve?
- Since heat is lost very slowly in space, do asteroids have any of their "original heat" left from their formation or collisions?
- If something was stabilized in the Earth-Moon L3 LaGrange point and it was knocked out of stability, what would happen?
- Is there a base of pi where some digits are much more likely than others to show up? Is it possible to have some base where some digit will never show up?
- How does alpha spectroscopy work and what is its purpose?
- If a 15,000 K star peaks in the ultraviolet. Does that mean we would not be able to see this star? Explain.
- Can data on AC EM waves be jammed by DC EM fields?
| Posted: 21 Mar 2017 05:06 AM PDT I have been researching radioisotope thermoelectric generators (RTG) and got stuck on why the decay releasing alpha particles leads it to being hot? also why do RTG need fins to dissipate the heat when we are trying to convert it to energy? [link] [comments]  |
| Posted: 21 Mar 2017 02:34 AM PDT |
| Posted: 21 Mar 2017 01:04 AM PDT I assume they also appear in the infrared and ultraviolet ends of the spectrum. [link] [comments]  |
| What laws/theories limit the maximum size of a cyclone/anti-cyclone on a spherical body? Posted: 21 Mar 2017 12:21 AM PDT This thought came to me recently looking at images of the massive cyclone structure on Saturn. If there is a planet of diameter n, how large can a cyclone/anti-cyclone be? I assume there an upper limit < the surface area of the sphere, but how is it constrained and what is the theoretical limit for any given body? [link] [comments]  |
| Posted: 20 Mar 2017 05:32 PM PDT I'm a kinesiology major so the energy I learn about comes from ATP. When the terminal phosphate breaks off from the rest of the phosphates, the bond breaks and energy is released. But what is that energy? Is it actually something, or is just a term used to describe something with no physical qualities? Also, I suck at categorizing my posts so sorry if I should have chosen something else. [link] [comments]  |
| How do scientists know how many protons, neutrons and electrons there are in an atom? Posted: 20 Mar 2017 11:39 AM PDT I am still in highschool and in chemistry while we are studying atoms and their Composition I have always asked myself as well as my teacher, how do they even know how many protons, neutrons and electrons there are if they can't even see the atom... Still today, I don't know the answer to that... [link] [comments]  |
| Where does "sound energy" goes, in active noise cancelling headphones ? Posted: 20 Mar 2017 02:44 PM PDT My understanding of noise cancelling headphones is that the headphone will produce the opposite of the external sound, and when added, those two sounds will cancel each other. This will result in no sound. The headphone uses energy to produce his sound wave. The external sound wave has an energy. The resulting soundwave (which is the sum of the two others) has no energy since its amplitude is 0. So, where do the initial energy of the soundwave and the energy of the headphone-produced soundwave go ? [link] [comments]  |
| Why does sound propagate faster through hot air eventhough it's less dense? Posted: 21 Mar 2017 12:44 AM PDT |
| What does the U on this magnet mean? Posted: 20 Mar 2017 01:32 PM PDT I'm in physics right now and we were given these magnets. My teacher and I are stumped as to what the U represents here. [link] [comments]  |
| Posted: 20 Mar 2017 04:10 PM PDT In the normal way of explaining this, it's told that someone on Earth would see time pass more quickly than someone traveling in a spaceship approaching the speed of light. How can we define one point as stationary and one point as moving if they're just two points in space? Wouldn't those labels be arbitrary, and the only real measurement would be the distance between the two points and its rate of change? [link] [comments]  |
| Do volcanoes form a shape that can be approximated by simple mathematical curve? Posted: 20 Mar 2017 04:09 PM PDT I was wondering if the shape of a volcano could be modeled by a simple mathematical curve. Presumably, the lava flows will try to follow the path of least resistance to the ground - does this result in a certain, predictable shape forming (such as the caternary shape of a hanging string)? Could such a shape be modeled as some kind of trigonometric/exponential/power function? [link] [comments]  |
| Posted: 20 Mar 2017 09:15 AM PDT |
| Posted: 20 Mar 2017 09:37 PM PDT Let's say something at L3 gets knocked around a bit. Will it move along an Earth Orbit towards L4 or L5? If so, how long would it take to get there (minutes, days, months, eons)? And would it stop at L4 / L5, or keep moving in a new orbit? Or would it just crash into Earth? [link] [comments]  |
| Posted: 20 Mar 2017 07:33 AM PDT For pi in base 10 it seems that all digits are fairly regularly equal in occurrence (3.1415926...) but is there a base, for example base 4, where a certain digit is much more likely or less likely than others (e.g. 3.022202022200022...)? Is this the case for other numbers such as e? [link] [comments]  |
| How does alpha spectroscopy work and what is its purpose? Posted: 20 Mar 2017 12:20 PM PDT |
| Posted: 20 Mar 2017 08:07 AM PDT |
| Can data on AC EM waves be jammed by DC EM fields? Posted: 20 Mar 2017 07:00 AM PDT For example: Could an AC electromagnetic wave with a frequency of 1Hz, propagating towards a receiver with a limited amount of data, be disrupted or 'jammed' by a DC electromagnetic field, which entirely surrounds the receiver although obviously with a frequency of 0Hz? If yes, is there a frequency range within which 'jamming'/interference of AC EM waves by DC fields is possible (ie 1-100Hz)? [link] [comments]  |
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