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Thread: 1 potato, 2 potato,3 potato, 4....5 potato, 6 potato, 7 potato, more

  1. #1
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    Talking 1 potato, 2 potato,3 potato, 4....5 potato, 6 potato, 7 potato, more

    What could be better for an Irishman (I'm mongrel Irish/Swedish/German), than a physics paper about potatoes? This guy gives a size limit for small asteroids to convert from roughly potato-shape to spherical with a new limit. neat. SEE:http://arxiv.org/ftp/arxiv/papers/1004/1004.1091.pdf pete
    Last edited by grapes; 2010-Apr-11 at 12:08 PM. Reason: fixed url, left in celebration

  2. #2
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    Pete, you might like to clean up the link.

    http://arxiv.org/ftp/arxiv/papers/1004/1004.1091.pdf

  3. #3
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    Abstract: The Potato Radius: a Lower Minimum Size for Dwarf Planets; Charles H. Lineweaver, Marc Norman

    Summary: Gravitational and electronic forces produce a correlation between the mass and
    shape of objects in the universe. For example, at an average radius of ~ 200 km – 300 km, the
    icy moons and rocky asteroids of our Solar System transition from a rounded potato shape to
    a sphere. We derive this potato-to-sphere transition radius -- or “potato radius” -- from first
    principles. Using the empirical potato radii of asteroids and icy moons, we derive a constraint
    on the yield strength of these bodies during their formative years when their shapes were
    determined. Our proposed ~200 km potato radius for icy moons would substantially increase
    the number of trans-Neptunian objects classified as “dwarf planets”.
    0 1 1 0 1 0 0 1 1 0 0 1 0 1 1 0 1 0 0 1 0 1 1 0 0 1 1 0 1 0 0 1 1 0 0 1 0 1 1 0 0 1 1 0 1 0 0 1 0 1 1 0 1 0 0 1 1 0 0 1 0 1 1 0 ...
    Skepticism enables us to distinguish fancy from fact, to test our speculations. --Carl Sagan

  4. #4
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    Boil 'em, mash 'em, stick 'em in 'n orbit! (annoying flash. I warned.)

    Interesting (from the discussion section)

    Our derivation of the ~ 200 km – 300 km potato radius is related to the fact that on Earth,
    earthquakes away from subduction zones are confined to depths less than ~ 30 km. This is
    because plastic or ductile deformation of the rocks below 30 km is enough to relieve the
    deviatoric stress, or pressure differences – the same ductile deformation that allow potatoes,
    as they increase in mass, to become spheres.
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  5. #5
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    Does it really talk about electronic forces?

    ETA: I see their reference is Thompson's 1917 On Growth and Form, maybe that's where they get it. I have my copy around here somewhere...

  6. #6
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    I think in this case, the 'electronic' is in reference to all physical forces other than gravity.
    “It is a capital mistake to theorize before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts.” ― Arthur Conan Doyle, Sherlock Holmes

  7. #7
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    I heard Charlie Lineweaver this morning (about 11:20am local time) on local ABC radio - he's quite a character! Very refreshing to hear someone talk with such enthusiasm on the radio.

    Very interesting stuff!

  8. #8
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    Quote Originally Posted by Spoons View Post
    I heard Charlie Lineweaver this morning (about 11:20am local time) on local ABC radio - he's quite a character! Very refreshing to hear someone talk with such enthusiasm on the radio.

    Very interesting stuff!
    Spoons. Agreed. I've read a number of his papers. He's good. pete

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