Recent content by Tclack

Bill, since you're so helpful, in a kind of related question. I'm reading about all of those transitions, lymann, balmer, paschen, and more. Everytime I look it up it always begins with: "in the hydrogen emmison spectrum..." Are these names only for hydrogen? What about the other elements? Do...

Further research (numbers obtained from wiki, take that as you wish) Mass of a Proton 1.67262178 × 10-27 kg Planck mass 2.17651(13)×10−8 kg Clearly, the proton is much less massive than the Planck mass... Thank you Bill for clarifying this for me. Too bad, it was a cool idea...

I don't quite understand the paper about the renormalization problem. From the wiki article, I've arrived at the following: 1. These Planck units are just units that are physically derived from small natural hapenstances. i.e. are not plagued by earthly or human units, like the light-year, kg...

So, the three very small quantities: Planck length Planck mass Planck time Does the physical interpretation actually mean for example that when something moves, the smallest distance it can move is one Planck length, that there's no such thing as moving half a Planck length? And further...

I FOUND SOMETHING! It's on wikipedia and it's not sourced, but... http://en.wikipedia.org/wiki/Oxyanion#Naming Does this make any sense? Sulfate is SO4^2− But, let's assume we don't know that charge, and someone told us to write sulfate. So, it's not in group 7, so the central atom of S will...

Does there exist a fool-proof way of doing it? I've scoured the forums, and I've already found this question, but the answers are not satisfying. Here for example is exactly my question: https://www.physicsforums.com/showthread.php?t=525291&highlight=polyatomic+ions I've already...

Thanks for catching that! MY MISTAKE: After eliminating 0,1,2, etc. candidates, I choose the next best one and considered it a WIN if that number was better than all the previous. It should have only been a WIN if that number (their absolute rank) was a 1. I ran through it again and got the...

So, I'm trying to understand how to derive 1/e (~37%) If you are unfamiliar with the secretary problem watch this short uninformative (as far as proof goes) video: Note: the video focuses on getting a wife, but it's the same concept as choosing a secretary Now, I searched for a proof...

Yeah, that's it the "change in pressure" vs. the "absolute Pressure" is what got me. I suppose I could say that there's 25.7 psi on the drydock wall, but then there's 14.7 psi pushing back, and hence a net average of 11 psi felt along the drydock's Seawater side. Thank's for the input everyone!

I'm sorry to keep returning to the atmospheric pressure thing, but. If one square foot was submerged 1 foot underwater (horizontally for simplicity's sake) that would be 1*64/144 = .444... psi. When just before being submerged, the atmosphere was applying 14.7 psi. Would I add the atmospheric...

oh yeah, the 1/4 was in my original paperwork, I just missed copying it down. nice catch. I guess I'm just confused about this fluid force thing. What is causing the fluid force anyway? If it's just the random movement of the fluid molecules, then the higher the temperature, the more motion...

So I'm in the Navy. I work on an aircraft carrier that just went into drydock. The drydock has a large trapezoid door keeping the water out on one side. Our captain wants to know how much force is being held back on that door. I found the dimensions of it and calculated it, but now I'm having...

I hate memorization, but everywhere I look for the exceptions to Madelung's rule, you must memorize the exceptions. I can't see any patterns, I've tried looking at the standard periodic table and the circular table. Does anyone have any good insight into the exceptions? If I DO have to...

How do you figure out what the shape of molecules are. For example, Water. 1 part oxygen and 2 parts hydrogen with 104.45 degrees between the two hydrogen. That's what I want to figure out. I imagine it has something to do with the electrostatic force.

How do you determine the shape of molecules. water, as an example, the 2 hydrogen atoms are at a 104.45 Degree angle from each other. But how is that calculated? I'm assuming it has something to do with the ratios of the electrostatic forces between the 2 hydrogen and the oxygen.