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cool thing i learned in physics today...

Discussion in 'The Lounge' started by colbystephens, Apr 19, 2007.

  1. colbystephens

    colbystephens 1 ton status GMOTM Winner

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    well, we were talking about light waves and discussing how electromagnetic waves (light) carry energy. well, in the diagram that follows is an instrument that, when placed in a vaccuum, when you shine light on the white faces (these have black faces on the opposing side) of the pieces which are attatched to the disk, it will rotate around the axis (shown as the triangle). this is because momentum is associated with light waves and, long story short, because black absorbes light and white reflects it, the momentum of the light waves pushes on the white faces causing the toy (such as in the figure) to rotate counterclockwise.

    if it is not in a vacuum, the black absorbs the waves and the air molecules heat up infront of the black faces. this causes those molecules to bounce into the black faces and the toy would rotate clockwise instead of counterclockwise because the bouncing air molecules have more momentum than simply the light... interesting! :)

    rotational machine.JPG
     
  2. TSGB

    TSGB 1 ton status

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    I'm strange. I've had a grasp of odd and end things like this since Jr. High. :doah: But put an algebra problem in front of me, and I'll pull my damn hair out.
     
  3. colbystephens

    colbystephens 1 ton status GMOTM Winner

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    then it's good that i left all the calculus/algebra out of the description - or we'd have a dedicated CK5 anti-hawk in the crowd... :D
     
  4. TSGB

    TSGB 1 ton status

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    More like a drooling mental health patient... :haha:
     
  5. Jagged

    Jagged 1 ton status

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    Speak for yourself bud.
     
  6. broncoman6524

    broncoman6524 1/2 ton status

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    i sleep in physics...lol. hte only reason i stay awake someitmes....is that one girl:rolleyes: :haha: right now its not too bad though...were learning about electicity and wirign and ****. (EASY) LOL its like another auto class but just elec.
     
  7. kgillyk5

    kgillyk5 1/2 ton status

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    So???...What way does it turn if you flush it down a toilet in Belgium?
     
  8. colbystephens

    colbystephens 1 ton status GMOTM Winner

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    don't sleep too long - that subject takes off and goes crazy w/ gaussian surfaces, integrals and derivatives beware!
     
  9. broncoman6524

    broncoman6524 1/2 ton status

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    yeah i know...i try not too. lol. my teacher sux ass. we basically teach ourselves. its the end of the year ive learned about force, work etc etcetc, and now electiricy that is ALL weve learned:rolleyes:
     
  10. colbystephens

    colbystephens 1 ton status GMOTM Winner

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    i know what you mean - i've had a few instructors like that.
     
  11. Russell

    Russell LB7 Tahoe Status Premium Member GMOTM Winner

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    When I wind up with an instructor like that, I pair up with the hot, but dumb, blonde in the class, and teach her whats going on -- Not only does it majorly re-affirm it in my mind by explaining it to someone else 30+ times in a row, it also gets you major browny points with the hottie when she eventually gets it!
     
  12. broncoman6524

    broncoman6524 1/2 ton status

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    haha i never thought of it like that! LOL!:haha:
     
  13. XHitman396

    XHitman396 1/2 ton status

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    yeah, to hell with all that crap. flux, induced magnetic and electrical currents, fields, inducers, light refraction (mildly interesting) and everything else involving physics II. but then again i, too, have a case of the professor who should be a wal-mart greeter. oh, and in a class with over 150 students, there's only one hot chick. damn engineering college...
     
  14. colbystephens

    colbystephens 1 ton status GMOTM Winner

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    i don't know man, maybe you shouldn't be blaming the engineering school but perhaps be blaming oklahoma... :wink1: j/k
     
  15. XHitman396

    XHitman396 1/2 ton status

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    haha, we may not be California, but we've got plenty of eye-candy on the campus.. plus all them texas wimmen come up here for reasons i neither understand nor question...
     

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