14 February

Lec 28 | 8.01 Physics I: Classical Mechanics, Fall 1999

Hydrostatics – Archimedes’ Principle – Fluid Dynamics – What Makes Your Boat Float? – Bernoulli’s Equation

View the complete course: http://ocw.mit.edu/8-01F99

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Duration : 0:49:0


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25 Responses to “Lec 28 | 8.01 Physics I: Classical Mechanics, Fall 1999”

  1. tremer88 Says:
    February 14th, 2010 at 12:06 pm

    the rock is more …
    the rock is more dense than water. took me a minute to get it

  2. tremer88 Says:
    February 14th, 2010 at 12:06 pm

    this is why im not …
    this is why im not in college

  3. wis2k Says:
    February 14th, 2010 at 12:06 pm

    @rusnacko
    …
    @rusnacko
    initially we have:
    m(rock)*g + M (boat)*g = V1 (initial displaced water) *rho(water) *g
    after throwing out the rock IN THE WATER :M(boat) * g = Vb (water displaced by the boat only) * rho(water)*g
    and V2(total displaced water with rock in the water) = Vb + V(rock)
    finally we have :
    V1 – V2 = m(rock)/rho(water) – V(rock)
    V1-V2 = V(rock)*[rho(rock)-rho(water)]/rho(water) since rho(rock)-rho(water) > 0 => V1>V2 => the waterline goes down

  4. JeanEmanuel Says:
    February 14th, 2010 at 12:06 pm

    They’ll get some of …
    They’ll get some of their 25000 U$S comission back AHAHA just by showing that the balloon goes forward when you accelerate your car! I don’t think that it would be enough satisfy my parents, profesor!

    You’re great!!! I ve learned so much because of you. Thank you, Walter! Thank you, MIT! =)

    Greetings from Argentina!

  5. aschrits Says:
    February 14th, 2010 at 12:06 pm

    Amazing Guy!
    Amazing Guy!

  6. Naam19 Says:
    February 14th, 2010 at 12:06 pm

    This guy is …
    This guy is actually a genius.He is very logic.

  7. thesethreekings Says:
    February 14th, 2010 at 12:06 pm

    Captain Calculus @ …
    Captain Calculus @ 1:05

  8. davideugene Says:
    February 14th, 2010 at 12:06 pm

    this was the best …
    this was the best lecture so far, AWESOME.

  9. lbowden123 Says:
    February 14th, 2010 at 12:06 pm

    how come your vid …
    how come your vid is 49 mins long when max is 10?

  10. emyr999 Says:
    February 14th, 2010 at 12:06 pm

    Isn’t it …
    Isn’t it astrophysicist?

  11. Vorbis5 Says:
    February 14th, 2010 at 12:06 pm

    I’m in 8th grade …
    I’m in 8th grade and this is so inspiring. I’m motavated to get good grades now and become an astrophysist! (no sarcasm)

  12. coolestdude80 Says:
    February 14th, 2010 at 12:06 pm

    Professor Lewin is …
    Professor Lewin is awesome. He uses calculus like most people breathe.

  13. goodluckpeace44 Says:
    February 14th, 2010 at 12:06 pm

    there there good …
    there there good chap, what does jesus have with this class

  14. jonjagp Says:
    February 14th, 2010 at 12:06 pm

    jesus is boring
    jesus is boring

  15. azt129 Says:
    February 14th, 2010 at 12:06 pm

    lol!

    “and that’s …
    lol!

    “and that’s why she couldn’t get it up”

  16. goodluckpeace44 Says:
    February 14th, 2010 at 12:06 pm

    actualy in a ship …
    actualy in a ship how ever center of mass is higher than boulian center. it has to have a nice metacenter, having too long will be too shaky and too low will be dangerous

  17. goodluckpeace44 Says:
    February 14th, 2010 at 12:06 pm

    good job i couldmnt …
    good job i couldmnt figure that out i like to be your good friend

    good luck
    peace

  18. thiswasatest Says:
    February 14th, 2010 at 12:06 pm

    Yes youtube is very …
    Yes youtube is very very costly for me

  19. Stantje Says:
    February 14th, 2010 at 12:06 pm

    its interresting! …
    its interresting! But the calculations are easy to solve. The teacher looks like a Dutchmen who is speaking english, isnt he?

  20. houseofjesus Says:
    February 14th, 2010 at 12:06 pm

    id hate to be one …
    id hate to be one of the kids in that class!!!!!!!! bbbbbbbbbbbbbbbboooooooooooorrrrrrrrrrrrrrrrrrriiiiiiiiiiiiiiinnnnnnnnnnnnnngggggggggggggg

  21. X3QT0R Says:
    February 14th, 2010 at 12:06 pm

    whats the answer …
    whats the answer for the cranberry juice and the glass and the cardboard stuff?

  22. rusnacko Says:
    February 14th, 2010 at 12:06 pm

    Yes, thank you, …
    Yes, thank you, that is indeed much easier to understand. Very cute problem anyway.

  23. OJReadMore Says:
    February 14th, 2010 at 12:06 pm

    edit: gah typos :D …
    edit: gah typos :D that’s m(rock)/rho(water)…not minus

  24. OJReadMore Says:
    February 14th, 2010 at 12:06 pm

    I can also confirm …
    I can also confirm your calculation is correct for the boat problem. Thank you so much rusnacko! I’d like to manipulate one of your equations to make it look easier to understand:

    V(after) = V(before) – m(rock)/rho(water)

    You can see here rusnacko was right, the term m(rock)-rho(water) will lower the inital volume.

  25. rusnacko Says:
    February 14th, 2010 at 12:06 pm

    edit: sorry, it is …
    edit: sorry, it is not Pascal`s, but Archimedes` principle. :)

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