I've seen derivations where both methods are used in FEM packages. My question is what are the benefits of one over the other? From what I can see is that virtual work would be more broad since it can handle nonlinearities (minimum of potential energy derivation assumes geometrical and material linearity), so why bother with minimum of potential energy?
If I have a monochromatic laser that gives off short pluses in femtosecond range, I can calculate the uncertainty of my energy calculation. That is the spread of the energies emitted by the laser. How do I find the minimum and maximum energy? For a massive particle you can find the minimum energy with basically KE(min)=p^2/2m. How do you do this for a photon? Is it even possible? would it just be your calculated avg energy plus or minus the uncertainty? I am not even sure if what I am asking makes sense.
Thanks
We end up with a total arrangement of nuclei & bound elctrons that's 'lower in the potential well' than it was when those same charged bodies were arranged in the form of the precursors of the chemical reaction; and much, or maybe all, of that energy ends-up as heat - ie extra kinetic energy of the new molecules. So the question is: as the reaction is in-progress, do the rearranging electrons perform their 'motions' in such a way as directly to exert the force on the atoms & fragments of molecules necessary to accelerate them to their new higher speeds?
As far as I can figure, the only alternative would be for the energy to appear in the very first instance as photons, which then are absorbed by the new molecules, which receive the energy of those photons. But I can't really see it working like that, because each photon would, through necessity of conserving momentum, only be able to impart a miniscule amount of kinetic energy to the molecule or fragment of molecule, so that an excessively large № of these photons would have to be generated - over-&-over again, with the molecule getting a tiny boost (about ½Q^(2)/mc^(2) ) each time it absorbs one ... with some of them escaping & being easily detected as bright light of specific wavelengths, which doesn't happen in the case of combustion of such things as petrochemical fuels, although it does happen in the case of combustion of metals.
So if the chemical energy is directly converted into kinetic energy of the products, where would I find account of how it occurs? - ie the quantum mechanics of how the rearranging of a bunch of electrons & more massive positively charged bodies directly translates into relative motion of the finally-formed parts.
Or, to put it more crudely, does the settling of the electrons into their new places constitute a kind of tiny 'railgun' that 'launches the more massive parts off' as they are in the process of constituting themselves, & therefore whilst their own electronic configuration is in a more excited state that the rapidly-changing electric & magnetic fields due to that 'settling' of the electrons can get 'a handle' on?
It probably does translate directly into kinetic energy, doesn't it. We can imagine two bodies, each of which can store energy by internal vibration, colliding, & the energy of the collision going-into exciting the vibrational modes of the two objects that have just collided. Now fo
... keep reading on reddit ➡I have been working on a first-principles argument for a minimum ETH price based on projected increases in total transaction fees paid. These transaction fees become ETH holder revenue in Eth2's proof of stake model.
In Eth2, we can think of the financial "income statement" for "Ethereum, Inc." as being the revenue of transaction fees minus the operating cost of the network. This would provide a minimum price for ETH based on the free cash flow generated by transaction fees.
If anyone has experience in this kind of financial modeling and also understands Eth2 well enough to hypothesize about future transaction fees, please DM me.
EDIT: See link to spreadsheet in comments, which suggests $760 ETH as the hypothetical minimum ETH price as the present value of a perpetuity based on the last 90 days of transaction fees and assuming 100x growth in total transaction fees on Eth2 at maturity (USD). Also assumes $0 operating cost for the network.
EDIT2: the spreadsheet shows a strong correlation between the price of ETH in USD and the total tx fees paid over last 90 days in USD. This makes sense anecdotally because people say things like "gas prices go up if ETH price goes up!" But in theory a transactor's willingness to buy gas should be independent of the current price of ETH. The worrisome implication is that gas consumers may be massively overpaying by sticking to wallet defaults which are expressed in gwei and not USD. If the gas market was more efficient then we might see much lower total tx fee spend overall, which means that hypothesized future Eth2 total tx fees might have to see more like 1,000x growth (or more) to equal a good future ETH price of $700+. These are the kinds of questions I'd love to get help with.
A sphere of radius R carries a volume charge density of p(r) = k r^2 , where k is constant. I am asked to calculate:
a) the electric field everywhere
b) the electric potential everywhere
c) the total electrostatic energy
Any help would be greatly appreciated!
If I make only minimum payment son my BofA card that has 0% APR for 12 months, do the minimum payments reduce the principle amount that was loaned to me via credit line?
I am not looking for ("debt is bad" or "don't do that"), I would just like some clarification as I may be making several purchases for a business. Thank you very much!
Since Work-energy principle is expressed in terms of kinetic energy and electrical energy is only expressed in terms of potential energy, can this principle ever be used to solve circuit related energy problems?
Sorry if this question is sketchy. I recall reading a long while ago, on a reputable forum about physics, about something to this effect: that there is an alternative way of conceptualizing basic physical principles, such that one can essentially derive a Newtonian physics framework using something other than the standard textbook set of foundational principles and ways of thinking about physics. If I am not mistaken, the core set of principles for this alternative framework involved something to effect of minimizing energy usage along certain "paths" (sorry, I know that's very vague). I have a vague notion that this might have involved something about calculating line integrals, and used a notation where the letter "s" was a commonly used variable, although I might be mistaken about that.
Can anyone clue me in to what I might be thinking about here?
Nets have played 42 games of which KD has played 36. Until the 17th of February, which is a month from now, the Nets will have played 17 games which he will also miss.
That's a total of 6+17 = 23 missed games out of 57 games played for the Nets up to that point, so 34/57 played.
Considering he will definitely also rest for at least a couple more games after that, he will have missed 25 games total at the end of the season and will have played 57.
That's IF he returns in 4 weeks and not 5 or 6, and if he only misses 2 games after that.
Is KD out of the MVP race?
I know the quantized energy solution for the infinite square well are given as a function of (n^2 /(2m*L^2 ). I am looking to solve for the lowest possible potential energy in a half infinite potential well that will yield a bound state inside the well. What I was considering is using the heisenberg uncertainty principle, setting the uncertainty of the position to L (we want the particle to be bound inside the well, so can we consider the well to be the position uncertainty?) and from there we gain the upper bound of the momentum, which we can use to solve for energy through Vmin=p^2 /2m. Is this a valid approach? Can it be applied like this? Let me know if any more information is needed! Thanks in advance.
Legitimately a question I have that seems to counteract the "but if we don't pay [insert said slavewage like tipped wages] we won't be able to stay afloat" argument
Of course this is only applicable in countries with tipping but by doing this you acknowledge the kind gesture. Some restaurant managers know that certain guests will tip their service staff well and therefore allow them comp dishes or drinks. Don't expect it or ask for anything free but when you do receive a free item tip accordingly and don't bring it up in a review or to anyone else (sometimes this gets people in trouble). Above all else be kind, forgiving, and that will make you memorable to your beloved bars and restaurants.
Edit: many people are complaining about if you tip it's not really free but the tip is really paying for service and not the food. For those who don't understand the benefit of doing that should consider tipping on what the check would have been you are still getting an 80% discount and will probably receive more food at this price in the future but that's if you plan on returning to this establishment and continuing to receive a discounted check. It's a classic case of what you want now versus what you want most.
Edit 2: I'm not rich. I save money by tipping my people well. I only posted this because I know people that frequent restaurants and have wondered why they aren't getting gifted dishes anymore. There's no easy way to tell people they are bad tippers and you can see that by the way people reacted to this post. Non Americans we get it, I can't change the system I'm trapped in we get it your country is so much more civilized. I have no healthcare and work for tips but when you go out to eat in the US you are also participating in that system and hope you can treat people humanely and not be belittling.
Just in case you didn't read the fine print/TOS like me.
Edit: it looks like the fee is whatever you have left of the 3-month commitment. So if you cancel after 2 months, the fee would likely be $23.95. It'd be in your best interest to just cancel after the 3 months have passed, unless you really want to avoid paying taxes on the subscription cost.
Just updating this week numbers, 24 BTC traded (around 1millon USD). Remember only measured with LocalBitcoin. There you can go BTC > Bs. (Bolivares, national currency) and Bs. > BTC. I'm a Venezuelan living in the country.
The week before was 25 BTC, almost the same.
Binance is king, the P2P option to go:
From Bs. to USDT, BTC, BUSD, BNB, ETH, SLP (yep, you can go direcly from SLP to Bs), DAI and DASH and from these coins to Bs.
Sadly, Binance doesn't offer the stats of the amound traded. But it is safe to assume Binance has absorbed all the amount that LocalBitcoin used to trade (In 2019 beween 5-10 millon USD were traded weekly, now it is around 1million).
Some remarks:
- Four months ago, goverment removed six zeroes from the currency, meaning 1,000,000 "old" Bs. are now 1 "new" Bs. Today 1 BTC is around 220,000 "new" Bs. months ago it would have been 220,000,000,000 "old" Bs.
- Monthly minimum wage is 2 USD that is for public workers and they receive some kind of incentives (a monthly box of food that is around 20 USD), you cannot live with that.
- If that is you only income, you died years ago starving or your family is helping inside Venezuela or from abroad or you have another job or you left the country (even walking).
- I would say it is hard to find someone that would work for less than 50 USD monthly. Average monthly wage is around 80 USD.
- Some NGO say around 500 USD monthly are needed for a 5 members family to "live".
- There are in fact so many places (department stores, big ones like Traki, Biomercados) where you can pay directly with crypto. People always use stablecoins like "USDT" (what a fear), USDC, BUSD, AirUSD and so on.
- 2021 inflation was around 700%.
Any question, feel free to ask.
Some sources:
https://coin.dance/volume/localbitcoins/VED/BTC
https://coin.dance/volume/localbitcoins/VED
https://localbitcoins.com/country/VE
https://www.bloomberg.com/features/2016-venezuela-cafe-con-leche-index/
