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Planet 9 would certainly be "dim", but whether it would be dark according you your definition is impossible to say. Planet 9 needs to be smaller or further away than Pluto, otherwise its gravitati...
If planet 9 exists, is it correct to say that it is a "dark planet"? By "dark" here I mean to a planet that doesn't reflect enough light to easily be seen from normal telescopes (in the current co...
TL;DR Yes, that will work. It may not be practical, but that is a separate issue. There are two measurements routinely used for cooling in the US: BTU = British Thermal Unit = heat to raise the...
Is this advice correct? Are they alluding to Freezing Point Depression? Adding salt to tap water lowers the Crystalloid's freezing point. Pour 3 tbsp (51 g) of salt into each of your 3 plast...
It depends on what the failure was. Working the hinge could possibly make the little screw come loose quicker. This is the screw that acts as the shaft of the hinge. If the hinge actually broke,...
Please see the images below. I owned these Mykita John glasses for three years, which feels short for glasses to break! Every day, I fold them them before placing it on my night stand and going to ...
In Srednicki's proof of the spin-statistics theorem for scalar fields ("Quantum Field Theory", section 4), he considers interaction terms, added to the free Hamiltonian, that are Hermitian function...
In 1970, the USSR began drilling at the Kola Super-deep Borehole. The target depth was 15,000 meters; The stated areas of study were the deep structure of the Baltic Shield, seismic discontinuit...
This looks like something the soldiers are being trained to do, or were trained to do. This means procedures were likely worked out that mitigate most bad effects most of the time. The top pictur...
I stumbled these pictures on Quora, and I'm assuming they were real. Wouldn't the supporter (person whom gun is mounted on) suffer hearing loss? Wouldn't the barrel burn his ear? I'm assu...
I'm not asking about cleaning human organs here. This handheld power scrubber looks like your average rotary toothbrush! Indubitably I know that a toothbrush's brush head can be far gentler than...
Let's say we have a single plate with liquid on both sides rising up due to surface tension. The meniscus formed has a radius of curvature $R$. I'm trying to find the excess pressure, i.e, the pre...
To be optically equivalent, the lens made from lower index of refraction material needs to be thicker. My guess is that your optician thinks the metal grooved frames you want won't work well with ...
My optician counselled me I don't recommend a 1.74 index with a metal grooved frame, like the one you want from ic! Berlin, because the edge will be less resilient and be more susceptible to chi...
I don't understand either of these Reddit comments that are still too complicated. Please simplify? Alfenhose An interesting phenomena, it is because the brain doesn't store what you saw during ...
The major advantage of AC is that is can be easily transformed to different voltages. This is important because current transport is most efficient if the currents are low (because the losses are p...
This is a small site with 5 questions in 30 days, rudeness is just going to drive people asking questions away. Casual users seeing newbies get insulted for not knowing things isn't going to make ...
From my perspective, I can only agree that rudeness isn't exactly ideal. In general, if someone's being needlessly rude or aggressive etc., editing/suggesting an edit that improves the post is a g...
What should our policy be toward rudeness? I don't think being blunt is a problem, but I do think that calling into question the OP's intelligence is a problem. For example, I don't think there's ...
The major advantage of Alternating Current is that it can be transmitted to large distances without significant losses, which is not possible in Direct Current. This is incorrect Answering the re...
The major advantage of Alternating Current is that it can be transmitted to large distances without significant losses, which is not possible in Direct Current. Had economical superconducting wire...
As apparently seems par for this book, the theorem statement you're paraphrasing involves vaguely defined or completely undefined terms. For example, it talks about "admissible (smooth) paths" but ...
I have a question about the discussion of constrained Lagrangian systems in the book Mathematical Aspects of Classical and Celestial Mechanics by Arnold et al. (section 1.2.5). The Lagrangian syst...
I recommend https://www.mat.univie.ac.at/~neum/physfaq/topics/position.html which, while a bit hard to read, is more comprehensive and written by someone more authoritative than me. My research did...
The Papers Category I don't think the "Papers" category would work well for physics. It would get a lot of spam, and I think it would be much more limited in usefulness than the one on Electrical ...
