Recent content by philip porhammer

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    Undergrad How far away can 1KW of RF energy be detected?

    I'm thinking in Light years...like what SETI is looking for RF signals
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    Undergrad How far away can 1KW of RF energy be detected?

    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...
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    High School Acceleration of a pumpkin from an air cannon

    I just looking to make a t-shirt for my daughter and I with some equations and an air cannon, thantks
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    High School Acceleration of a pumpkin from an air cannon

    air cannon theory has good equations! thanks!
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    High School Acceleration of a pumpkin from an air cannon

    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...
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    Undergrad Heating of elements with laser light

    thanks, P
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    Undergrad Heating of elements with laser light

    ok thanks
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    Can Ion Thrusters with Continuous Iron Expulsion Power Interplanetary Probes?

    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.
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    Undergrad Heating of elements with laser light

    so, the valance electrons in a lattice of Iron would change the frequency or bandwidth of an absorption line?
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    Undergrad Heating of elements with laser light

    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
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    Undergrad Atomic Electron Jump Wavelengths

    thanks, I have been wondering about this for awhile
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    Undergrad Atomic Electron Jump Wavelengths

    what is the process that creates Gama rays? or, is a photon considered to have a wave length range?
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    Undergrad Atomic Electron Jump Wavelengths

    what is the shortest wavelength of light that an atom can radiate by electrons jumping shells, and longest wave length
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    Perigee & Apogee: How Earth's Orbit Impacts Summer Temperatures

    does the Perigee and Apogee of the Earth's orbit relative to the seasons affect the temperature of our summers?
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    Undergrad Equation for falling objects that includes terminal velocity

    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...