swansont

As opposed to everyone else, who had done so much better at that point.

What do you mean by “restricted to reply”? What, specifically, are you doing? Do you see the “submit reply” button on the lower right, below the text box?

A PhD is not a guarantee of lots of money, or any specific job. The narrative of getting a degree and becoming a professor is not based on the reality of the job market, as CharonY notes. To paraphrase a former boss of mine, a PhD in physics affords the opportunity to work on interesting problems.

Will the next one be inadvertent?

If you drop something on a scale, it will initially register more than the weight of the object. How does one disprove this as the effect?

I’ve read that the flow rate is pretty much constant in an hourglass, except at the very end. There is less sand falling because the distance it falls decreases. It’s not like a liquid, where the flow rate depends on the column height. It’s part of why hourglasses are useful. Only a small fraction of sand is in freefall. But all we have to go by is this video. What is the source of the additional information? How does one disprove an explanation? There are studies that show the extra apparent weight of an hourglass.

@Genady, you are making claims that are not in evidence. Can you share it?

Three derivations of Euler’s formula here: https://mathvault.ca/euler-formula/

Also the issue isn’t merely a lack of hydrogen, it’s a lack of hydrogen in the core, where the fusion takes place. Dumping hydrogen into the star won’t help, unless that hydrogen gets into the core, which has a lot of helium in it as it goes into the red giant phase

https://www.itron.com/na/solutions/product-catalog/everblu-cyble-enhanced “The EverBlu Cyble™ Enhanced is compatible with EverBlu fixed network for daily data transmission or on-request meter reads. … Alternatively, its data can also be collected using AnyQuest™ mobile reading system.“

Sometimes the function is important, rather than the numerical result of a definite integral e.g. if you integrate Fdx, rewritten as mvdv, you get 1/2 mv^2, the equation for kinetic energy Introductory physics has many such examples

Fundamental particles like electrons tend to be points. But they also have a wave nature. The vertical lines are a result of the slits being vertical. If you have diffraction through a circular hole, you get a bright dot surrounded by concentric rings http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/cirapp2.html https://en.m.wikipedia.org/wiki/Airy_disk

Also that this is a statistical issue and not systematic, i.e. that a similar repetition of waypoints would not cause failure, and that doesn’t ring true.

You’re free to start up a company with this business model. A lot of people make long-distance calls, and a lot of people have cell phones who don’t get charged for long-distance, so good luck with that. Long-distance surcharges made sense when the infrastructure was more cumbersome (copper connections, operators), but that’s not so much the case anymore.

The article I linked to said the planned release is 22 TBq per year. 1 mole has an activity of about 1.1 10^15 Bq, so 1.8 g is ~660 TBq. Of course, the tritium will decay over that time.

Anything with a high heat capacity will retain a higher temperature for a while. It will also take longer to warm up. Basalt is 0.84 kJ/kg-K (0.84 kilojoules required to raise 1 kg by 1 K, or 1 degree C) https://www.engineeringtoolbox.com/specific-heat-solids-d_154.html Wax and beeswax are significantly higher How warm something feels to the touch depends on how well it conducts heat. Room-temperature metal feels cool because it conducts heat well.

The raw amount is meaningless without knowing the concentration, and the resulting activity per liter. 1.8 g of tritium in a liter of water is quite different than the same amount in 10,000 liters https://www.reuters.com/world/asia-pacific/japan-release-fukushima-water-into-ocean-starting-aug-24-2023-08-22/ “The water will initially be released in smaller portions and with extra checks, with the first discharge totalling 7,800 cubic metres over about 17 days… That water will contain about 190 becquerels of tritium per litre, below the World Health Organisation drinking water limit of 10,000 becquerels per litre, according to Tepco”

One method of tritium production is from neutron activation of lithium-6, yielding an alpha and tritium. Heavy-water reactors like CANDU will separate/recover tritium, but that’s going to have a higher concentration of tritiated water than a light-water reactor.

That would depend on the needs and desires of the people with the device. There’s nothing inherent in a QC that makes them resistant to an unauthorized person using it.

Yes, such batteries exist https://en.m.wikipedia.org/wiki/Betavoltaic_device Separating tritiated water is difficult and might not be cost-effective at low concentrations. If you do mass separation you’ll also get water with O-18, which has the same mass. So there’s probably a threshold below which it’s not worth the effort.

1. Yes. If the upper limit is a constant this is trivial, since it will be a rectangle. 2. You should stop using a language model that makes stuff up to get factual information

It’s used to light up “exit” signs where electricity isn’t readily available. https://www.nrc.gov/reading-rm/doc-collections/fact-sheets/fs-tritium.html Long-term storage is problematic since it decays away (12.3 year half-life)

Right. It works best on polar molecules, like water.

The cap only applies to G7 countries. If some other nation transports the oil, there is no effect. It seems likely that non-G7 ships have taken up the transport of oil. Edit: https://www.hellenicshippingnews.com/sanctions-on-russian-crude-and-diesel-exports-are-failing/ “Mainstream European tanker owners have largely abandoned the Russian trade now that the country’s crude and diesel have breached Western price caps. The so-called “shadow” fleet — tankers operating outside Western insurance and financial circles — has taken over”