Recent content by lzkelley

  1. L

    Temperature due to resistance calculator?

    Unfortunately I think your best (if not only) bet is to measure some values at known temperatures and fit those to the equation. You have 3 constants, so you need at least 3 measurements, more would be better. The boiling and freezing points of water would be the easiest to do. If you don't...
  2. L

    How Accurate Is Our Estimation of the World’s Ocean Mass?

    Very sorry! I took, "Two-thirds of the Earth is sea" to mean that you thought that 'two-thirds of the Earth was sea.' I clearly should have known you meant something completely different. Your numbers look good; your radius is a little big, but your density a little small (for sea-water)...
  3. L

    How to Choose the Right Research Project as an Undergraduate?

    Hi Liszt, I'd suggest you first decide what your primary goal is of this experience. Clearly its going to be some balance of learning/experience and building up your CV/applications, but which is there one or the other that is at present more important? If that doesn't help, you might...
  4. L

    Would a knot in a falling chain make a difference?

    Can you provide some more information about the problem you're looking at, and what exactly you're wondering will happen... I'm not following you so far.
  5. L

    Angular momentum in planetary/satellite orbital systems

    Cool question. I don't think the moon's rotation would change in the way you're thinking. To conserve the angular momentum of the moon around the planet, its speeds up when its closer to the planet (Kepler's law... etc). The ROTATION of the moon has no angular momentum with regard to the...
  6. L

    Compton vs. Raman vs. Thomson Scattering

    Turin and Bob S; thank you both--you're responses have been very helpful!
  7. L

    Compton vs. Raman vs. Thomson Scattering

    I'm reviewing my scattering processes and can't quite pin down the difference between raman and compton... It sounds like Compton scattering is exactly the same as Raman scattering (with inverse-compton = raman stokes scattering; and normal compton = raman anti-stokes scattering). Also, just...
  8. L

    Einstein's The Field Equations of Gravitation Paper

    Einstein's "The Field Equations of Gravitation" Paper I'm trying to find a translated copy of this paper - but i can't find one anywhere! The 1905 papers are all over the place; i thought the this would be similar. Does anyone have a copy, or recommendations on where to look? Thanks...
  9. L

    Can a black hole predict its own growth before it happens?

    Thanks everybody for your posts; all quite insightful. I think xantox's above post is getting there--but what metric can be used to show the anticipatory, absolute horizon growth?
  10. L

    Can a black hole predict its own growth before it happens?

    I'm reading Hartle's "Gravity," for the general relativity class I'm taking; chapter 12-Gravitational Collapse and Black Holes says, "A horizon's locaton at anyone moment depends on the geometry of spacetime to the future of that moment." (pg. 168) That statement is vague and prozaic -- but a...
  11. L

    Image Processing Software; suggestions?

    Hi, I'm in an astrophysics lab course - and the CCD image processing software on the physics department computers are .. frustrating to say the least. I was wondering if anyone had any suggestions for something i could download and run on my mac; preferably free. Thanks,
  12. L

    Probability of consecutive elements in set

    Lets say i have some number 'N' of numbers - in a particular order. I then remove some fraction 'F' of those numbers. I want to know the probability of there being (some number) 'Y' consecutive initial-numbers remaining. Any ideas? Would it just be F^Y ?
  13. L

    Difference between Mixed State and Superposition

    From my modest experience, there is no real technical difference. Perhaps when you're talking about the net effects / measurables etc - you refer to it as a superposition; while you're talking about the constituent states etc - you refer to it as a mixed state?
  14. L

    Digestion Qs: Humans, Plants, Stomach & Intestine

    For your first question; even though we can't fully digest the cellulose (note that complete digestion is breaking things down to almost the individual molecular level to be absorbed), we can still mash it up/break it apart -> to get to the sweet sweet innards of plant material. Similarly, a...
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