Disregarding big leaks, what is the main mechanisms for tires to lose pressure over time? Is it the valve? Or does air permeate through the rubber? |
- Disregarding big leaks, what is the main mechanisms for tires to lose pressure over time? Is it the valve? Or does air permeate through the rubber?
- Is it possible to orbit a planet/star at its escape velocity?
- How do we know how big neutron stars are?
- If a photon doesn't have a an anti- counterpart because it is a boson, does that mean that a Helium-4 atom also don't have a anti- counterpart?
- What do we know about the long-term risks of getting a flu shot every year?
- Does a mass current have the same gravitational field than a static line of mass?
- If I have an AC source with a current limiter, what is the minimum voltage required for current to pass through my body (hand to hand) and what current would be fatal?
- Would corium from a nuclear reactor meltdown (for example, in Chernobyl) present Cherenkov radiation if submerged in water?
- Are electrons farther in atoms with more protons?
- When you break/snap something, (i.e. String, a stick, a carrot) what is actually making the noise that we hear?
- How do firefighters determine the percentage of fire contained?
- Do planets reflect more or less light based on their composition?
- What is dark matter, and how is it relevant to our understanding of the universe?
- How do different wind speeds affect wildfires?
| Posted: 12 Oct 2017 04:12 AM PDT |
| Is it possible to orbit a planet/star at its escape velocity? Posted: 12 Oct 2017 05:13 AM PDT |
| How do we know how big neutron stars are? Posted: 12 Oct 2017 05:14 AM PDT I've heard they are around 20 km in diameter. But how on earth do we know this when they are so far away? Is it just a guess based on their mass? [link] [comments]  |
| Posted: 12 Oct 2017 04:04 AM PDT In the newest episode of PBS Spacetime ( https://www.youtube.com/watch?v=OvgZqGxF3eo ) they called He-4 a boson because it has a total spin of 0. Does that mean that it doesn't have a anti particle counterpart? [link] [comments]  |
| What do we know about the long-term risks of getting a flu shot every year? Posted: 12 Oct 2017 04:47 AM PDT Upfront disclaimer: I'm not an anti-vaxxer crazy person. I received all my vaccines as a kid and adult, and believe kids should get vaccinated for life threatening illnesses. That being said, what do we know about the long term risks of being vaccinated for the flu year after year? The CDC website states that the flu vaccine is 100% safe. Is this really true? How do they know this? Has anyone studied the long term effects of being vaccinated every year? What about the effects of thiomersal? And a few side questions: why does the CDC now recommend flu shots for everyone? It used to be recommended only for the elderly. Was it because of industry lobbying? Is the flu vaccine intended primarily to protect individuals, or is it only really effective when there's a critical mass of "herd immunity" in effect? How many people actually die of the flu every year? I personally don't know anyone who has died from the flu. [link] [comments]  |
| Does a mass current have the same gravitational field than a static line of mass? Posted: 12 Oct 2017 12:24 AM PDT In analogy to electromagnetism. A static line of charge creates a static electric field but a moving constant electrical current in the line creates a static magnetic field. I know there are possible gravitomagnetic theories but I'm not suggesting this kind of solutions. I'm asking if there is a difference between the gravitational field of a line with constant linear mass and a line of constant speed moving masses, according to standard theories (classical or GR). [link] [comments]  |
| Posted: 12 Oct 2017 03:25 AM PDT |
| Posted: 11 Oct 2017 11:24 PM PDT |
| Are electrons farther in atoms with more protons? Posted: 11 Oct 2017 06:19 PM PDT Assuming that in a H atom there is 1 proton, the electron would be at "1" distance, close enough to gravitate around the proton but also not that close to fall into it. If we add one more proton, shouldn't the distance of the electron be multiplied by a constant? It couldn't just be at "1" distance... It would be attracted, right? Is this important in order to understand elements? [link] [comments]  |
| Posted: 11 Oct 2017 08:04 AM PDT |
| How do firefighters determine the percentage of fire contained? Posted: 11 Oct 2017 03:49 PM PDT |
| Do planets reflect more or less light based on their composition? Posted: 11 Oct 2017 06:08 PM PDT If (somehow) a planet were made by glass in the surface, wouldn't it reflect more light than a planet most made of some black material? [link] [comments]  |
| What is dark matter, and how is it relevant to our understanding of the universe? Posted: 11 Oct 2017 03:49 PM PDT |
| How do different wind speeds affect wildfires? Posted: 11 Oct 2017 03:27 PM PDT I was listening to NPR discussing the current wildfire situation in Napa, California and a recording clip mentioned how ~%20-%30 wind speed really bad for trying to contain the fire. Would slower wind speed cause the flame to essentially stagnate and burn out? Would higher wind speeds be able to kill off a wild fire? [link] [comments]  |
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