I find relativity to be a tricky one to understand even for other non relativity physics tutors. I have seen various youtube physics channel's which are generally reputable reporting on the twins paradox and claiming the "time difference" all occurs during the deceleration / acceleration phase...
I have a statistics joke but it's not significant
I have a fraction joke but 7/5 persons won't get it
I have a chemistry joke, but still in reaction
i have a biology joke, but it is not fully developed
I have a thermodynamics joke, but i'm out of energy
I have a tensor joke but it is not...
Thank you for the responses. He seemed to be obsessing over the escape velocity at the event horizon being the speed of light to which I was responding that just because the escape velocity is the speed of light that does not mean you need to travel at the speed of light to fall into a black...
I am having a debate with someone who appears knowledgeable about black holes from the language he is using but we have a disagreement about if matter can enter a black hole. He is trying to tell me the gravitational gradient near the event horizon is such that spaghetification occurs as you...
That come's down to how security conscious you are and how much you can trust online sources. I had a similar debate about password manager previously on this forum and introduced the concept of zero knowledge policies and was assured that LastPass employed this policy and that a local solution...
As an IT pro I use KeyPass, it's a downloadable program which creates a password vault as a local file which is encrypted with a master password. It's an offline program, no synchronising with the web, all your data stays local to that file which you can backup and copy to another computer just...
They say quantum tunneling only works on atomic particles, I would like to dispute this claim as I have personally experienced macro scale quantum tunneling many times this past year. I have even created a "device" which seems to be able to produce this effect at will, usually at the most...
Share names do not need to have a $ sign on them. The $ at the end of the share indicates a hidden share so if you browse the machine remotely you will not see it come up but can still access it if you know it exists. You can create shares using the $ at the end if you want them to be hidden also.
Windows performs scans in the background for malware daily. If your laptop is an older model it could be that the disk is just too slow to keep up with the modern operating system, I see this fairly frequently with older laptops. The problem is worse for "occasional" users as these processes...
From the linked white paper...
"Just like password managers do with passwords, the underlying OS platform will “sync”
the cryptographic keys that belong to a FIDO credential from device to device. This means that the security
and availability of a user’s synced credential depends on the...
So...just need to compromise 1 device, steal the private key, BANG access to all your other devices and online accounts. The security services will be rubbing their hands at this one, they probably had a hand in designing it.
Simplification usually comes at the expense of security, not seeing...
A trick I sometime is to simply pause the program for a few minutes. As your watching the next bit is downloading ready to be shown, sometimes if you just pause it and wait a few minutes the next part will download already and it will be smooth after that. This works for me when using youtube on...
Would suggest you try a different SD Card, if the issue persists then you know it's something to do with the dash cam itself. Perhaps the actual CCD sensor which collects the light is playing up intermitently. Sometimes the only option is to swap components to troubleshoot each one.
SD Cards have a limited number of write cycles before they start to fail. SD cards are not great when you need to write a lot of data all the time which cause them to fail prematurely. Could it simply be that you have had a lot of usage out of them already?
I see this in the IT industry fairly...
I wonder what kit this constitutes this time around, I was reading about the head of the EU saying yesterday that they have sent £1billion Euro's worth of arms to Ukraine since the start of the war but also in that time given £35billion Euro's to Russia for Oil & Gas...
As they always do, as innocent civilians. It's why I hate all this posturing by the bigger powers as it's always the civilians which end up suffering most in any conflict through no fault of their own :(
As for the responses to my previous thread about "over simplifying" the situation. You can't really get more over simplified than the default "Good vs Evil" narrative we are fed in our national media EVERY time we get involved in a conflict. It is almost never as simple as this and there are...
That would just further the narrative that the UN is controlled by the west and things like the decisions of prosecutions of the ICC are also a tool used by the west to further their own influence. Have they ever investigated alleged war crimes of western soldiers actions in the countless wars...
There's a Chinese base in Eritria I think it is just a few miles from a US base and the US has been accusing the Chinese of using blinding lasers against their craft there quite frequently if I recall correctly.
Well, it depends on if you consider surrounding Russia with bases, weapons, troops is a threat or not. I would argue it does constitute a threat in a similar way the how the US has surrounded China with bases constitutes a threat to them. There is no equivalent threat in the other direction from...
Quote from the Martian in the Buggs Bunny cartoon if I recall correctly as the Earth obstructs his view of Venus? Damn that dug up some old memories... :)
Tell me about it but it's fun at times seeing peoples misconception and silly claims. This site is by far my best resource for learning actual science.
As it happens this silly post got me thinking of what might happen in this scenario which brought me here to formulate more in depth questions...
So there is a post going around the facebook groups about what would happen if we could pour a Sun sized bucket of water onto the sun, the claim being that the sun would gain mass and become a bigger, hotter burning blue star. I know this cannot happen but I was just curious as to what would...
It's really down to software vendors to alert customers if their products are affected. I work for a cloud provider and we have been contacted by some vendors and others you can lookup online to see if they have published anything related to this. It's a big task which has had everyone...
Thank for your all your comments, as ever your definitions are far better than my own. They are however along the lines of my original thoughts which prompted me to create this post to begin with.
Referencing the quote above, I guess you could say the "definition" of "time travel" i am...
This is a very good point...which is making me thing long and hard about how to express this.
If an event can be in the past for one observer and in the future for another observer then each observers pasts and futures are all relative to themselves. This is what drew me to the conclusion of...
Assumptions:
There is no "absolute" time, time is all relative.
Taking the twins paradox as an example, both twins measure a different proper time when they re-unite due to each twin taking paths of differing lengths through spacetime.
Conclusion:
Time Travel itself is a completely...
I think you killed any chance of a response with this line, this forum is here to discuss established, peer reviewed and accepted science. This line implies you want to know how to validate a personal theory which is out of scope for discussion on this forum.
Could such a list be created? You...
https://www.theregister.com/2021/11/15/wireless_information_transfer_with_fast_neutrons/
https://www.sciencedirect.com/science/article/pii/S0168900221009013
Not sure there are any practical uses, but interesting none the less...
I focused on the CPU as it is the brains, everything else is useless without it.
I would think there are far too many neurons to map the human brain properly, I see this as an impossible tasks for today's technology.
I would think an advanced civilisation would be able to determine what the...
Seeing what the CPU is doing in real time is of no use if the commands its running are out of context, you don't know what the high level software is doing with that command, why it's running it, what it intends to do with the data, is it just setting up commands, is it the processing of actual...
CPU's have their own very low level programming language. You can connect to CPU's and run basic commands on them, I did this at College where we got to program the CPU directly using HEX to perform basics function like turning on a set of lights in sequence. This low level stuff you could find...
The explanation I gave is for web links themselves. An e-mail can be made to appear to come from any address very easily. Also there are normally two parts to links, the part which is displayed and the actual URL you will be redirected to. If you hover your mouse over the web link it should tell...
It's a big subject, no one understands it all, which bit do you want to know about?
Lets pretend instead of a computer you are asking how a car works. Do you want to know how the engine works? What it's made of? How we make the seats? How we make the doors? Where did the materials to make the...
The question is too broad, you can learn the basic components that make up a computer from the link posted by the above poster but you really need to be more specific in what you want to understand to a deep level as there are countless different things you could learn.
It's not unusual for antivirus checking programs to block code as they don't know what it is. Antivirus programs can and do check inside zip files for harmful content. There is usually a limit though as to how "deep" into the zip file they can go to check stuff, in my experience it is usually 2...
I know it's not possible to travel at light speed so this is just theoretical. As I understand it at relativistic speeds the distance you need to cover to travel to a destination are length contracted. If you were traveling at light speed is the distance between you and any object ever zero?
I have recommended this forum to someone who appears to be keen to learn Astrophysics as the amazing resource that this forum is. He is having issues signing up though and having issues with the following error:
Your account has been rejected for the following reason: Your registration has been...
Generating solar flares would require whatever you want to hit being stationary I would assume. I'm not aware how we use antimatter to accelerate an object.
Overall I guess I meant what can we possible achieve in the next say 500 years. I'm not convinced anything in post #12 we will ever be...
Not trolling here, just have genuine confusion over CO2 levels comparied to what we believe CO2 levels have been historically and their effect on climate change.
I recently saw some Facebook group infographic posts which claimed that CO2 concentration in the atmosphere is the lowest it has ever...
And what have they gained? An e-mail and a password for web sites where I have no personally identifiable info not even my name.
I have 2 separate e-mail address. My main personal e-mail address using my own domain on a e-mail server I run myself. Any sites with any personally identifiable info...
Why would I not be able to login to these site afterwards? What happens the first time you visit a site? It copies a cookie onto your computer just like any time one is required and not found. Sure it means you have to login to a website each time you visit it but so what, it's a minor...
I'm not the OP ;)
In either case, I do not repeat passwords on anything "important." If my PF account get hacked I have lost nothing, even if it did offer multi factor authentication (MFA) I would not use it as it's mildly annoying. I use separate randomly generated passwords on any sites which...
I've had this before, the password was a generic one I use for multiple sites non important sites (i.e sites like forums which do not have any personal identification / financial details present.) I just assumed at some point one of the web sites had been hacked and they just used this password...