# Search results for query: *

1. ### Hole edge stess area

I have a tube with a rod inserted into it at a set depth. The rod is held in place by a round pin that passes through a hole in the side of the tube and into the rod. Assuming the pin and hole are the same diameter or very close, I'd like to know how to calculate the stress area on the edge of...
2. ### Wavelenghs of oxygen

Thanks again Bill, I really haven't made myself clear. Here's where I am: Referring to the chart you referenced, I don't know what the cm^-1 values mean. I don't know why there are two values per energy level. I searched and found a number of values for Planck's Constant. I am assuming I should...
3. ### Wavelenghs of oxygen

Thanks Bill, I found those energy levels earlier in my searching. The problem is I don't know how to get the photon wave lengths associated with them. That was what I was hoping to find out from someone more knowlegeable than me. Where or how to get that info would be more helpful.
4. ### Wavelenghs of oxygen

Hi, I'm not a physicist. but I'm looking for the wavelengths of oxygen. I want to pump the electrons up to n=3 and I need to know what wavelengths given off from n=3 to n=2 and n=2 to n=1. I plan to use leds at those values to excite the electrons. If I had the books, I could calculate the...
5. ### Forces on a spinning disk

Thanks much. I'll try that.
6. ### Forces on a spinning disk

I would like to be able to calculate the forces on a spinning disk to determine the rpm it will fly apart given its dimensions and the mechanical properties of the material it's made of. I understand centripital and centrifugal forces. However, I'm not understanding how I to set up the problem...