What makes an explosive effective at different jobs? |
- What makes an explosive effective at different jobs?
- Is lightning blue because of same effect that causes ionized air, due to (cherenkov) radiation to be blue?
- How do you predict temperature/pressure relations above critical point?
- Nat Geo suggested if all ivecaps melt, sea would rise 216 feet... But Nashville according to it's fossil record is 535 feet of elevation and was once underwater as part of an inland sea. How is that possible? Was there more water?
- What is the maximum theoretical size for a sunspot?
- How do underwater rivers work? And why do they exist?
- Difference between real and ideal monatomic gas?
- Why are nuclear bombs detonated while they’re still thousand of feet in the air?
- What's the difference between 'Imaging optics' vs 'non-imaging optics'?
- What do the “A’s” in batteries stand for?
- Does the isotope of an element change the way a crystal structure is formed?
- How does the inside of a nuclear reactor work? Specifically the fuel rods.
- How BGA packaged chips connect the outside pins/balls to the die?
| What makes an explosive effective at different jobs? Posted: 12 Jun 2019 01:15 AM PDT What would make a given amount of an explosive effective at say, demolishing a building, vs antipersonnel, vs armor penetration, vs launching an object? I know that explosive velocity is a consideration, but I do not fully understand what impact it has. [link] [comments]  |
| Posted: 12 Jun 2019 01:30 AM PDT In cherenkov radiation, EM waves are emitted because the electrons move faster than the phase speed of light in said dielectric medium. Is lightning doing the same? [link] [comments]  |
| How do you predict temperature/pressure relations above critical point? Posted: 11 Jun 2019 04:30 PM PDT Phase diagrams end abruptly at the critical point. How do you predict what will happen to pressure in a closed vessel for increasing temperature above the critical point? I've read conflicting information, some says you can't use the ideal gas law, some says that it still applies to supercritical fluids. The discussion that prompted this question was whether a propane tank being impinged on by fire could reach steel weakening temperatures before the pressure exceeded the regular burst rating. (Propane critical point 97 C 42 bar, burst rating around 65 bar, steel weakens around 425C) [link] [comments]  |
| Posted: 12 Jun 2019 03:42 AM PDT |
| What is the maximum theoretical size for a sunspot? Posted: 11 Jun 2019 06:07 AM PDT |
| How do underwater rivers work? And why do they exist? Posted: 11 Jun 2019 10:15 PM PDT |
| Difference between real and ideal monatomic gas? Posted: 11 Jun 2019 03:06 PM PDT A level Physics, I have a question about internal energies of ideal vs real monatomic gases, however we havent covered this yet and I don't fully understand what the difference between these two is, please may someone explain? Many thanks. [link] [comments]  |
| Why are nuclear bombs detonated while they’re still thousand of feet in the air? Posted: 11 Jun 2019 01:57 PM PDT |
| What's the difference between 'Imaging optics' vs 'non-imaging optics'? Posted: 11 Jun 2019 11:35 AM PDT Hello, hopefully explaining at a high school level or below, can someone help me understand the difference? Is one about mirrors and the other about lenses? Thanks so much! :) [link] [comments]  |
| What do the “A’s” in batteries stand for? Posted: 11 Jun 2019 01:42 PM PDT What does it mean and what is the function of having two AA's vs having say 4 AAAA's? [link] [comments]  |
| Does the isotope of an element change the way a crystal structure is formed? Posted: 11 Jun 2019 06:00 AM PDT Or is the small difference in atomic size negligible and doesnt affect anything? [link] [comments]  |
| How does the inside of a nuclear reactor work? Specifically the fuel rods. Posted: 11 Jun 2019 01:22 PM PDT So along with everyone else I watched Chernobyl and immediately started Googling everything on reactors. The one thing I can't seem to find beyond the basic explanation is how the fuel pellets work. I understand that the fissile material hits a critical point and starts a reaction that generates heat that's used to make steam that turns turbines. Great. What I don't understand is what the cross section of a reactor with fuel in place looks like. Where do the control rods go relative to the fuel? Where are the fuel pellets in relation to each other? If they just need to be in proximity what keeps the reactor from going critical when they are installed in the first place? I just can't seem to visualize what the inside of reactor actually looks like beyond the fact that its a series of rods in channels. [link] [comments]  |
| How BGA packaged chips connect the outside pins/balls to the die? Posted: 11 Jun 2019 11:27 AM PDT In old style plastic DIP packages there are tiny single golden wires connect the pins to the silicon die. How modern BGA and PGA/LGA pins are connected to the die? [link] [comments]  |
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