Recent content by philip porhammer

I'm thinking in Light years...like what SETI is looking for RF signals

Summary: If you put a parabolic antenna in space, haw far away could a signal be detected? If the size of an antenna and frequency were not limited, how far could a 1KW RFsignal be detected? Would it be under the -120dBm noise floor? In space does the noise floor go down? assuming also that...

I just looking to make a t-shirt for my daughter and I with some equations and an air cannon, thantks

air cannon theory has good equations! thanks!

Summary: what is the equation for a pumkin's acceleration when the air pressure in not constant. My Daughter and I are going to Pumpkin chunkin for the first time. I would like to get two orange shirts and scribble: what part of this don't you understand: (DifEq?) acceleration of a pumpkin...

thanks, P

ok thanks

if one once of Iron was accelerated to 80% of the speed of light, could this be use of as a means of thrust for an interplanetary probe? where the probe has a continuous expulsion of Iron. and ignoring the need massive amount of power.

so, the valance electrons in a lattice of Iron would change the frequency or bandwidth of an absorption line?

One of the emission lines of iron is 404nm, would iron absorb the heat from a blue laser and not copper? Not a student, just an old curious guy. Thanks, Philip

thanks, I have been wondering about this for awhile

what is the process that creates Gama rays? or, is a photon considered to have a wave length range?

what is the shortest wavelength of light that an atom can radiate by electrons jumping shells, and longest wave length

does the Perigee and Apogee of the Earth's orbit relative to the seasons affect the temperature of our summers?

The cantaloupe is on a rope, from a pole sticking out of the window and if the terminal velocity is 18m/s, when the car is going 18m/s, the anel of the rope will be 45 degrees. Vt= G. i am getting closer, from this page:http://www.sciencebits.com/MR_Stokes_Drag I get this: I need to figure out...