How can people sever entire legs and survive the blood loss, while other people bleed out from severing just one artery in their leg? |
- How can people sever entire legs and survive the blood loss, while other people bleed out from severing just one artery in their leg?
- Has nuclear testing during the 20th century contributed to climate change, and if so, to what extent?
- Why is it better for Lithium-ion batteries to be charged after a partial discharge and not a full discharge, unlike the Nickel-based batteries, which had a memory-effect that caused them to hold less charge if they got charged repeatedly after being only partially discharged not fully discharged?
- Have we discovered anything that can move faster than massless particles? If yes, what and how?
- Do the transitions between energy levels of an atom take time?
- Is there a 3D equivalent to the "Four Color Theorem"?
- In one thousand or one million or ten million years, would the nuclear age of mankind (1945+) be evident to geologists studying soil samples?
- Magnetic Flux relative to distance from a magnet?
- Would a perfectly ellipsoid balloon feel a different amount of internal pressure at its equator versus at its poles?
- How can radiation travel if radiation is from particles?
- Are our gas planets in our solar system almost a perfect sphere/ellipsoid?
- Can you use Lagrangian equations for non-conservative projectile motion?
- An electron has mass, so does a charged capacitor weight more than a discharged one?
- Why does photons have no mass?
- Is it possible to demonstrate the Casimir effect without expensive equipment?
- How does a resonance chamber work, like in a guitar?
- In what layer of the earth are convection currents and tectonic plates?
- Why don't stove top heating elements short circuit when you put a metal pan on them?
- How do Hydrogen isotopes become more stable?
- What are the neurochemical underpinnings of midlife crises?
- Simplest/most efficient refrigeration system?
| Posted: 14 Jan 2018 09:48 PM PST |
| Posted: 14 Jan 2018 09:45 PM PST |
| Posted: 15 Jan 2018 01:49 AM PST According to battery experts , It's always better to charge lithium-ion batteries every time you could, and It's not recommended to wait for a full-discharge and then do a full-charge, unlike the Nickel-based batteries, Why is that? [link] [comments]  |
| Have we discovered anything that can move faster than massless particles? If yes, what and how? Posted: 15 Jan 2018 03:53 AM PST |
| Do the transitions between energy levels of an atom take time? Posted: 15 Jan 2018 07:27 AM PST More specifically, in an X-Ray tube, during the process of creating the characteristic spectrum, could, as a place on the lowest energy level becomes vacant, a Kγ transition start to happen, only to be "interrupted" by another transition, say from the L to the K shell? So I guess there are two aspects to this question,
[link] [comments]  |
| Is there a 3D equivalent to the "Four Color Theorem"? Posted: 15 Jan 2018 03:12 AM PST I know the Four Color Theorem states that 4 colors are enough to fill any planar map. Is there a three-dimensional equivalent? Intuitively, I think it should need 42 colors, but is there a proof? [link] [comments]  |
| Posted: 14 Jan 2018 08:49 AM PST |
| Magnetic Flux relative to distance from a magnet? Posted: 14 Jan 2018 06:39 PM PST If you have a 5 Tesla magnet, how many Tesla would you have at a distance of .01 meters and how would you calculate this. Also how would the angle of the magnet normal affect this calculation. With a dipole would you simply multiply the original strength by the inverse cube of distance? ( 5T* [1/.01m3 ] ) [link] [comments]  |
| Posted: 14 Jan 2018 07:00 PM PST Im working on a physics project on my own and couldnt find anything helpful on the internet, so I decided to ask you guys for help. Assuming the balloon is a perfect rotational ellipsoid, would the gas inside exert a different amount of pressure at its equator versus at its poles? How could i calculate the pressure felt at some point a given percentage of the way between the equator and pole? [link] [comments]  |
| How can radiation travel if radiation is from particles? Posted: 14 Jan 2018 07:15 PM PST Perhaps a stupid question, but in accidents like Fukushima Daiichi and Chernobyl, there is always talk about how the radiation spreads far from the site. How does this happen if radiation is the release of specific particles from atoms? I'm just starting to get into the different radioactive particles and don't have a very good grasp of the creation and distribution of radioactive particles from their original atoms. [link] [comments]  |
| Are our gas planets in our solar system almost a perfect sphere/ellipsoid? Posted: 14 Jan 2018 08:46 PM PST |
| Can you use Lagrangian equations for non-conservative projectile motion? Posted: 14 Jan 2018 01:59 PM PST I posed this question to my math professor before the weekend, so I'm sure he will have an answer for me next lecture. However, I would like to know if I was on the right track with what I though my solution should be. For the question we are given an object that launches vertically upward at 160 m/s and undergoes only quadratic air drag with a drag coefficient of 0.0043 m-1. The drag coefficient is defined as (k/m). Now I've done the problem (which asks for time to max height, and distance travelled to max height, as well as total time for flight) using forces [ ma = -kv2 -mg (going up) , and ma = kv2 - mg (going down) ] but I was wondering if it would be possible to use Lagrangian equations to solve this. From what I understand I need a dissipating function to account for the energy lost because of the air drag, and I think I can use the Rayleigh dissipation function defined as, F = (1/2)k(dy/dt)2 Then when I put the dissipation function into my equation I would set the negative partial derivative of F with respect to the partial derivative of y(dot) equal to the Lagrange equation? At this point am I on the right track? Thank you in advanced, and sorry for my awful formatting. [link] [comments]  |
| An electron has mass, so does a charged capacitor weight more than a discharged one? Posted: 14 Jan 2018 05:40 PM PST |
| Why does photons have no mass? Posted: 14 Jan 2018 04:16 PM PST Been looking at alot off stuff about photons, but have not found a good, easy and direct explanation for why they dont have any mass. [link] [comments]  |
| Is it possible to demonstrate the Casimir effect without expensive equipment? Posted: 15 Jan 2018 12:49 AM PST Hello, I'm curious if it's possible to demonstrate/measure the Casimir effect on a low budget with simple equipment. [link] [comments]  |
| How does a resonance chamber work, like in a guitar? Posted: 14 Jan 2018 02:15 PM PST I understand that the string is connected to the bridge which vibrates the faceplate, but I don't understand whats going on inside the soundhole, in the body. Is it the size of the "chamber", meaning the size of the pocket of air, that determines it's resonance? How are the soundwaves coming out, not interfering with the ones going in? [link] [comments]  |
| In what layer of the earth are convection currents and tectonic plates? Posted: 14 Jan 2018 06:46 PM PST I have always found it confusing to visualize the convection currents, because while tectonic plates are always above, I've seen in some diagrams where they are located in the asthenosphere, the lithosphere, and the lower mantle. [link] [comments]  |
| Why don't stove top heating elements short circuit when you put a metal pan on them? Posted: 14 Jan 2018 11:42 AM PST |
| How do Hydrogen isotopes become more stable? Posted: 15 Jan 2018 12:40 AM PST Just a question Id like some quick clarity on. Do they just lose neutrons exclusively? Why so? Thx 8) [link] [comments]  |
| What are the neurochemical underpinnings of midlife crises? Posted: 14 Jan 2018 01:07 PM PST Midlife crises / existential crises are intense psychological states which may have a huge impact of the well being of people, as they act upon impulsive decisions with poor impulse control, sometimes throwing away career, assets, family, friends. What do we know about what triggers them, and the neuro chemical cues and changes which accompany these life changing emotional crises? Bonus question: Are there ways to prevent them, or mitigate them? [link] [comments]  |
| Simplest/most efficient refrigeration system? Posted: 14 Jan 2018 08:46 PM PST A piece of wire across a 9v battery for example is technically 100% efficient at converting energy into heat. Is it possible to achieve this efficiency with refrigeration? What's the most efficient refrigeration system? Or at least theoretical refrigeration system? [link] [comments]  |
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