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[Physics]What's the colour of the bear?

Discussion in 'General Chat' started by orlando2008, Oct 23, 2008.

  1. #1
    A bear falls down to a hole. It falls down to 20m deep after 2s.

    What's the colour of the bear?


    From: Chinese Advance Level Examination
    SEMrush
     
    orlando2008, Oct 23, 2008 IP
    SEMrush
  2. DaveMM

    DaveMM Peon

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    #2
    The bear is White...





    A hunter walked one kilometer south from his camp. Then he walked one kilometer west. There he shot a bear. Then he walked one kilometer north, and found that he was back at his camp.

    What color was the bear?
     
    DaveMM, Oct 23, 2008 IP
  3. orlando2008

    orlando2008 Peon

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    #3
    That's white:eek:
    but how can you guess it?
     
    orlando2008, Oct 23, 2008 IP
  4. DaveMM

    DaveMM Peon

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    #4
    I am a physics teacher.

    Only in the polar regions does A = 10m/s^2, hence the bear must be a white polar bear :)
     
    DaveMM, Oct 23, 2008 IP
  5. milamber

    milamber Banned

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    #5
    Wowowowowowww wait a minute.. BRAVO DaveMM I like you LOL! Can you explain more how was that white?
     
    milamber, Oct 23, 2008 IP
  6. orlando2008

    orlando2008 Peon

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    #6
    Adoring!!!!!!
     
    orlando2008, Oct 23, 2008 IP
  7. DaveMM

    DaveMM Peon

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    #7
    The bear fell 20m in 2secs…

    The average acceleration due to gravity is 9.8ms^2

    However this is an average. You will get a different acceleration at different points on the earths surface because the earth is not a perfect sphere in fact it is more like a squashed orange. At the equator acceleration is lower than the average because the earth is wider at this point and at the poles the distance from the centre of the earth is less and so the acceleration due to gravity is higher in this region…
     
    DaveMM, Oct 23, 2008 IP
  8. RightMan

    RightMan Notable Member

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    #8
    Too much shooting of the bear is going on here......

    Financial markets world over can perhaps take help of this shooter to shoot down the bears who are on wild rampage.... :rolleyes:

    Regards,

    RightMan
     
    RightMan, Oct 23, 2008 IP
  9. pachecus

    pachecus Well-Known Member

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    #9
    WHITE....!!!!

    01. The bear has fallen from a height of 10 m

    02. It took square root(2) sec for it to fall.

    03. Obviously it's initial velocity is zero (since it's a freely falling body).

    04. Let's assume the acceleration due to gravity is: 'a' meters/seconds square at that place.

    05. So applying the formula.. S = ut + (1/2*a*t^2) we know... u = 0, S =10, t = square root(2) secs Hence, 10 = 0*sqroot(2) + {(1/2) * a * 2 }

    06. Solving the above equation gives a = 10 meters/seconds square

    07. For a free falling body 'a' is the gravitational pull which is g=9.8m/s^2

    08. Hence at that place where the bear fell, the acceleration due togravity is the highest (its greater than 9.8 and since wkt a)

    09. This can happen only at the poles .. (North or South)

    10. And we know that only polar bears can survive in the sub zero temperatures of the poles

    11. And no points for guessing that the colour of a Polar bear is WHITE!!!
     
    pachecus, Oct 23, 2008 IP
  10. 1prox.r

    1prox.r Active Member

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    #10
    The bear should be red in color as it would definitely "CRASH" after a 20 M fall, thus bleeding badly.
     
    1prox.r, Oct 23, 2008 IP
  11. kodut

    kodut Well-Known Member

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    #11
    :rolleyes: the color before he had fallen was asked
     
    kodut, Oct 23, 2008 IP
  12. DaveMM

    DaveMM Peon

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    #12
    White!! with red spots then...
     
    DaveMM, Oct 23, 2008 IP
  13. Kerosene

    Kerosene Alpha & Omega™ Staff

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    #13
    What if a polar explorer's teddy bear falls down the hole?

    [​IMG]
     
    Kerosene, Oct 23, 2008 IP
  14. l3fty

    l3fty Well-Known Member

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    #14
    hm... down a 20m hole with no lights?

    the bear is black.

    unless the hole is in a glacier or something, in which case

    the bear is blue.
     
    l3fty, Oct 23, 2008 IP
  15. dx.revolution

    dx.revolution Banned

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    #15
    what the hell are you guys talking about anyways
     
    dx.revolution, Oct 23, 2008 IP
  16. ellie.beans

    ellie.beans Peon

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    #16
    Wow! I'm very much amazed! haha, very nice one. I didn't get it at first:)
     
    ellie.beans, Oct 23, 2008 IP
  17. Stroh

    Stroh Notable Member

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    #17
    1 KM south + 1KM west + 1KM north != Complete square.

    Thus by proof of contradiction he did not land at his camp, unless his camp is a KM long at which who the hell would have that.

    Diagonals are also longer than 1 KM thus your theory is false.

    Also, if it even was remotely close, the bear would be either Brown or black.
     
    Stroh, Oct 23, 2008 IP
  18. blackflagwtf

    blackflagwtf Peon

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    #18
    Dave, nice work!
     
    blackflagwtf, Oct 23, 2008 IP
  19. beacon.seo

    beacon.seo Well-Known Member

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    #19
    nice work!!!
     
    beacon.seo, Oct 23, 2008 IP
  20. zyan_08

    zyan_08 Peon

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    #20
    OMG.. i NEVER PASS for my physic test :( im impressed with you DaveMM
     
    zyan_08, Oct 23, 2008 IP