petschge

44 ms·

421.
by petschge 7y ago
Stop spouting this "even organelles need gravity" non-sense. Also: Going from quantum mechanics to classical mechanics is well understood as the limit ħ -> 0. What we don't have a good handle on right now is the connection
422.
by petschge 7y ago
Ours as mammals maybe. But there is life "as we know" it that works perfectly fine without gravity. Just look at the recent news about fungi growing all over the ISS. No gravity necessary and quite obviously life by our standards.
423.
by petschge 7y ago
Why do you say gravity is important for organelles? At those length scales other forces are MUCH more important than gravity.
424.
by petschge 7y ago
If you had a working detector taking good data than not hearing it also tells you something. But if the detector was not taking good data for whatever reason (local seismic event, high surface winds, technical glitch), then it doesn't
425.
by petschge 7y ago
That's probably not longitude, but right ascension which is typically given in hours (and minutes and seconds).
426.
by petschge 7y ago
It does come from a single point but they can not tell where inside the shaded area of space the single point was. As far as I can tell from their website the event was seen by Virgo and only one of the Ligo detectors (Livingston), which ma
427.
by petschge 7y ago
Two problems with that: going up is only 3% of the energy that is required. The other 97% is "going fast enough sideways to stay up". The other problem, even if you angle your shot, is that you need to raise the perigee so that yo
428.
by petschge 7y ago
A longer landing gear to get the plane higher off the ground doesn't fit into the existing gear well in the wings. So you would have to redesign the wings. This required making sure that the loading on the main body stays the same. By
429.
by petschge 7y ago
This is also known as "liquid rescale" and there is (was?) a gimpl plugin for it. It last updated in 2013 or so. After that the developer was hired by Adobe to work on Photoshop.
430.
by petschge 7y ago
In 2d electromagnetism splits light waves into TE and TM modes that don't couple to each others (until you add a dielectric). That is unusual to our 3d picture, but doesn't break electromagnetics. And the generalization of the cro
431.
by petschge 7y ago
A blog is not automatically non-private and commercial. If you have ads you make money. Just possibly less then you spent on hosting. And yes that should have read "A P.O. is not sufficent.". Sorry for that mistake.
432.
by petschge 7y ago
Not any website. If it is purely private and non-commercial you don't have to. Also, it doesn't have to be "all your personal information". Your Name is required and an address where you could be served with court papers
433.
by petschge 7y ago
I remember seeing a statistical analysis here on HN that said the numbers for Tesla autopilots are neither great compared to drivers of Teslas nor do they seem to be fair. (They found a case where a human driver had a crash in what would ha
434.
by petschge 7y ago
And computers have a hard time with that. Take the following example code: #include <math.h> #include <stdio.h> #include <stdlib.h> double f(const double x) { return pow(x, 1000) / pow(x, 998); } i
435.
by petschge 7y ago
Kids in school say "why do I to learn X, I am never going to need it in real live". And then you end up with adults who don't believe that the earth is round, that vaccines are low-risk and extremely beneficial and think that
436.
by petschge 7y ago
It is still important to know, even if most division problems you encounter are handed of to a calculator or computer. Why? Because understanding long division is a required background for understanding polynomial division. And understandin
437.
by petschge 7y ago
except by the definition of dual numbers eps^2 is 0, as is eps^3. So the slope you computed is 0, which is rather wrong for (a complicated representation of) y=x.
438.
by petschge 7y ago
As a physicist I have a similar reaction to a bunch of topics. Sometimes people are very happy with the insider info I can bring to a thread (e.g. how does the EHT create it's picture), but sometimes you get so much opposition from peo
439.
by petschge 7y ago
A) If it can not see beta and gamma radiation it is completely broken. You should test that before you use the Geiger counter. It is neutrons and to some extend alpha radiation that you might be blind to. B) Of course there is batteries in
440.
by petschge 7y ago
Let's run the numbers for say a Boeing 767. It has a wing area of 290 m^2 and the main fuselage of 5 meter width and 60 meter length, so lets assume another 200m^2 of surface area. 490m^2 of solar panel can generate 0.2 * 490m^2 * 500W
441.
by petschge 7y ago
Which actually drop relative humidity, because water does not magically appear.
442.
by petschge 7y ago
Most of those problems have been considered unsolvable for a long time. Recent advanced in artificial hearts and heart assist devices (LVADs) have shown that at least a small fraction of the problems can be solved. For the rest? I'm no
443.
by petschge 7y ago
ECMO is not sustainable for long. The extra mechanical stress on the platelets and all the precautions you have to take against blood clots forming on any off the artificial surfaces are rather damaging. And since it is an expensive, short-
444.
by petschge 7y ago
NOR and NAND are symmetric in their arguments. The other four universal gates are anti-symmetric. In other words you have to remember and be careful which input is which. Why would anyone chose to deal with that extra complication when they
445.
by petschge 7y ago
It has less pull, but it orbits slower and therefore has a longer time to pull on the Sun.
446.
by petschge 7y ago
Typically the error due to your numerical integrator that runs Newtons law backward in time (or forward for predictions) is larger than the floating point error after a few time steps and it is not uncommon to run for millions of time steps
447.
by petschge 7y ago
If you look carefully at the orbit of Mercury you can see that it is elliptical. Pluto is also somewhat elliptical, which is hard to tell directly but given away by the fact that it crosses inside the Neptune orbit (this is also mentioned i
448.
by petschge 7y ago
It's not quite that simple to absolve Canada (and Europe and the US) from their responsibility for this problem. Quite a bit of the plastic that ends up in those rivers far away was exported "for recycling" to the countries w
449.
by petschge 7y ago
Even if every paper is amazing, I still don't have the time to read about all topics. So even if every submitted paper is great and should be published, we still need sorting by topic. Add to that the fact that "publish or perish&
450.
by petschge 7y ago
All I can say is that all the feeds that currently promise to solve that problem (Nasa ADS, Google Scholar, Researchgate and the feeds of several journals) are all pretty bad. I get several suggestions for medical/biophysical papers ev

More ›