Lost Definition and 564 Threads

Hello, I've been running into some frustrating issues with my MCNP deck. Photons are getting lost which is terminating the run file prematurely. When consulting the output file there seems to be some sort of geometry issue, but there are no fatal errors that I can see so I'm lost on how to...

In my intro class, I am trying to design for radiation sources. Currently, I am trying to plot the flux from neutron and photon source locations progressively moving further and further away, however the code is not running and it says "geometry error: no cell found run terminated because 10...

I recently went to look for a conversation I had a while ago and found that all my conversations had vanished. Any hopes of getting these back?

I keep getting particle lost error even though there were no hole in the lattice. Can someone identify any mistake in my code?

Even after I had moved, I still felt like I didn't really have a purpose in my life. I was just fooling myself into thinking that moving away from my previous living arrangement would enable me to figure out what it is that I want. In truth, when I moved away almost a year ago, all I did was...

Are lost volts the difference between EMF and terminal pd?

"Heat is the transfer of kinetic energy between molecules. If the velocity is more, the kinetic energy will be more so that the heat is more." "As an object's speed increases, the drag force from the fluid increases exponentially. For example, when you drive at high speeds, the frictional force...

Was it that they were lost at sea for 91 days? Did they have lemons? From what I understand, (1) people do not die of hunger, but (2) they will die without water, even though (3) they cannot survive on water alone in the long run because, (4) at the very least, scurvy will kick in. I think...

Hi there! Me again. I am doing my research about converting HEU research reactor to LEU. I made FA and core finally and started using the burnup card to check changing of Keff and fission products. Well, the thing was only with one-month burnup my Keff was decreased drastically from 1.118 to...

Hi Pfs, When Stephen Hawking proposed the idea of black hole information it appeared that information could be lost. it was a problem in GR which is a dererminitic theory. Knowing initial data and Hamiltonian tells you what was and will be. It is not the case in quantum physics. things evolve...

We lost another great icon of the 1960's: Judith Durham of The Seekers https://www.rollingstone.com/music/music-news/judith-durham-the-seekers-australia-singer-dead-obit-1393839/ https://en.wikipedia.org/wiki/Judith_Durham Most famous song was Georgy Girl: and my two favorites: It Doesn't...

I don't know how much this relates to this subreddit. But I feel I have lost my peak learning form. I used to get dissolved in studies. And I used to love whatever I am studying. I used to understand everything. Nowadays my problems-: 1) I simply can't focus properly. I need to study in laptop...

I'm about 25,000 words into my latest novel and the story arc is coming together nicely, but one aspect I need thoughts on please is what would happen inside a spaceship that has been grievously damaged in battle to the point that it has been abandoned by the fleet as a 500m long wreck...

Hi all, I was interested in ideal shapes for lenses and Google popped up this very old thread: "Mathematical shape for a lens with no spherical aberration"A member named Redbelly98 replied (<link>) with a now-broken link to a Thorlabs page that gave an aspheric lens equation. Took a minute...

Problem: "There are 40 yellow, green and red candies in the basket. If all the yellow candies were replaced with green candies, there would be 7 times more green than red candies in the basket. If we replaced red candies with green candies, there would be 4 times more green candies in the basket...

Let's imagine for a moment that the universe stopped expanding somehow (even though the evidence we have suggests this is not going to happen) and gravity made it contract until reaching a Big Crunch state. According to our actual understanding of physics and our current working models, Is it...

MCNP6 gives me a "10 particles got lost" error when I try to run the attached input file modeling a 3x3 fuel lattice surrounded in coolant. As I understand it, this error is usually related to the geometry/surface definitions of each component, but I'm unsure of what the source of the error is...

We know that the Ug is converted to KE and Us. I thought that since the system loses energy after the collision that we shouldn't use the equation hnew= delta x + h. I thought instead that maybe the h we should use is xmax, because that's when there is maximum Ug and there is no other energy...

Hi All, Can anyone recommend a free/cheap app to track lost Android phones? Did a search and saw a few sources but wanted to see if someone here can personally recommend. In case it helps, its an LG K8.

Imagine the two terminal of a *parallel-plate capacitor* are connected to the two terminal of a battery with electric potential difference #V#. If the capacitance of the capacitor is #C#, and the area of each plate is $A$. In this process would the energy lost by the battery and the stored...

The current in transmission cables = 20 MW / 240 kV = 250 / 3 A Power loss in cables =(250/3)2 x 20 x 103 = 139 MW , which is not possible Where is my mistake? Thanks

Hello, I am remembering that I started a bachelor in physics from 2005/6, 15/16 years ago but I feel I got stuck in that, I graduated in 2012 after many personal struggles to cope with. I loved physics and the idea to find something new and it was hard to cope with the reality that there is a...

I tried finding the distance but I later on got confused.

Inertia I = 2/5 mr² m=5.98* 10^24 kg. r=6.38* 10^6 kg. I= 9,736 * 10^37 kg. Earth rotation is V= (2 * pi* R)/T = (2*pi*6.38*10^6m)/(24*3600s)=463 m/s angular velocity w= V/r =463m/s/(6.38*10^6m)=7.27*10^-5 rad/s Enerrgy, E= 0.5* I*w²=2.57*10^29 j I get the...

Hi! Basically this is the exercise: Given the covariance of x and y is -12 and the variance of x is 6,5, using the least squares line of best fit connecting x and y yo estimate the value of x when y=15 x 2 5 9 7 9 10 7 y 25 17 11 10 8 7 13 any help would mean everything, I'm desperate :(

This is a question that came up on the, Hiking Camping Forum. If your lost in the wilderness in cold freezing weather and you need to take advantage of anything to stay warm, if you need to pee should you get rid of it because it reduces body mass and your body can keep you warmer with less...

I've never sold anything on ebay.com; only purchased. Now they are requiring my Social Security number evidently as an IRS requirement to make sure the IRS is getting their money from sales. Bye Bye Ebay

Any idea? I am pretty lost

The paper is reasonably old and was written as a phd thesis by (I believe) a man from china. It was basically the first paper on the subject and in it he effectively (from what I understand) dropped particles into a black hole, counting the information added, and saw that the black hole changed...

Hi, I have a simple question that I don't have a fundamental understanding of: do resistors dissipate reactive power (in addition to active power)? For context, when we are looking at a transformer (single phase) equivalent circuit (similar to the one in the image attached), we are asked to...

https://www.yahoo.com/news/mysterious-ancient-kingdom-193441382.html

If we consider quantum wavefunction-collapse, when we end up in a world-thread with a specific value of the measurement outcome, has information got lost?

Opinions on the book? Enjoying it, but I am an non-scientist sympathetic to the notion that we may have reached the practical end of theoretical physics. I wonder what happens to the field as we reach the point where no working theoretical physicist has added anything that expanded our actual...

I came across a significant figures problem today that I need information on. The problem is this: "What volume of water can a cylindrical container hold of it is 13.0 cm tall and 12.0 cm in diameter? Show your work and express the answer in scientific notation using significant figures." Of...

I don’t even know where to start. I especially don’t know how I would find the energy inside of the pump that would then be released to shoot a T-shirt.

My apologies if I'm doing this wrong, or posting this in the wrong place. Very new here. So anyway, I'm a sophomore physics major at tOSU and BOY OH BOY am I lost. I'm a high school drop out, and when I dropped out, I realized I liked physics and needed to know math to get to physics. I spent...

Suppose I fire a photon with an upward spin towards a hydrogen atom. It is absorbed by the hydrogen atom's electron which subsequently emits a photon when it returns to its ground state. I then fire another photon with a downward spin towards the same hydrogen atom and the same thing happens...

I have calculated the diffraction part for each one of the slits but I am not getting any lost order.

Since solar and wind power are fluctuating energy sources not all of it goes into the grid when the consumer power demand is lower than that actually produced. This is a well-known drawback of solar and wind energy that everyone talks about. What I never found is an assessment of how much of the...

I have a DrayTek Vigor 2926AC router that has an Ethernet feed as it's primary WAN and a 4G router (factory default settings + APN) as the Failover WAN. I also have Port Redirection set up in the DrayTek 2926AC. When I disable the primary WAN, the failover WAN activates and the internet is...

Hey guys, new here. Here is my first question for the forums: Let's say that I have a controlled environment for an experiment whereby I want to heat, say, one cubic centimeter of steel until it is white hot. Assuming that I have perfect containment set up for it such that no energy can be...

After I read Martin_K's post of 4:14 Oct. 30 on the frozen image of an object just before it fell through a black hole's event horizon, the next few minutes I was jumped by a handful of related ideas. First, the frozen image scenario is illustrative because when photons are frozen in place...

In Wikipedia's outline of the Many Worlds Interpretation of quantum physics https://en.wikipedia.org/wiki/Many-worlds_interpretation, it states "In many-worlds, the subjective appearance of wavefunction collapse is explained by the mechanism of quantum decoherence,...", yet I thought decoherence...

Hello, so I'm rather new here and I was wondering when I plug a USB device into an AC adapter, such as a phone how does it output exactly 5.2V and 2A? I'm aware that it goes through a transformer and rectifier but I heard somewhere that when the voltage is reduced the current is increased? Does...

Hi there, I am new in here, thanks for any reply. I took same title of a previous closed 3D by pranj5. As understood main part of the energy absorbed by PV panels goes in reflection and heat. The heat origins mainly in electrons that are excited but not enough to jump or they jump but they...

Having in mind the idea that "information is not lost" (referring to the black hole information paradox), is not the same rule violated in the wave function collapse? I.e. during the decoherence process information is not lost as this process of entanglement of some object with its environment...

I'm curious about how the math comes out when you apply conservation of momentum to the theoretical problem of a moving object having a purely inelastic collision with another stationary object in a single dimension. Since the velocity of the combined object is entirely determined by the...

In Total Internal Reflection, the beam can still lose some energy as it reflects off the boundary of the medium it is within. This isn't covered under the Fresnel equations. The energy loss is probably lost in the form of evanescent waves. I tried searching for the formulae describing the...

Hi All, I somehow cannot see the content of an Excel data file; please see bottom of document listing average of 34133, count of 11199, etc. Yet the data is for some reason I can't figure out, not visible/available. This Excel 2010. EDIT: The saved file has 329KB of data. But only that which...

Homework Statement Two circular plates, as indicated in the figure, slide one over the other. Calculate the torque lost in this situation. The rotation w of the internal radius of the plates R1, the outer radius of the plates R2, the absolute viscosity of the lubricant between the plates (η)...