Feb
14
Lec 28 | 8.01 Physics I: Classical Mechanics, Fall 1999
By
Hydrostatics – Archimedes’ Principle – Fluid Dynamics – What Makes Your Boat Float? – Bernoulli’s Equation
View the complete course: http://ocw.mit.edu/8-01F99
License: Creative Commons BY-NC-SA
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Duration : 0:49:0
25 Comments
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
February 14th, 2010 at 12:06 pm
this is why im not …
this is why im not in college
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
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!
February 14th, 2010 at 12:06 pm
Amazing Guy!
Amazing Guy!
February 14th, 2010 at 12:06 pm
This guy is …
This guy is actually a genius.He is very logic.
February 14th, 2010 at 12:06 pm
Captain Calculus @ …
Captain Calculus @ 1:05
February 14th, 2010 at 12:06 pm
this was the best …
this was the best lecture so far, AWESOME.
February 14th, 2010 at 12:06 pm
how come your vid …
how come your vid is 49 mins long when max is 10?
February 14th, 2010 at 12:06 pm
Isn’t it …
Isn’t it astrophysicist?
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)
February 14th, 2010 at 12:06 pm
Professor Lewin is …
Professor Lewin is awesome. He uses calculus like most people breathe.
February 14th, 2010 at 12:06 pm
there there good …
there there good chap, what does jesus have with this class
February 14th, 2010 at 12:06 pm
jesus is boring
jesus is boring
February 14th, 2010 at 12:06 pm
lol!
“and that’s …
lol!
“and that’s why she couldn’t get it up”
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
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
February 14th, 2010 at 12:06 pm
Yes youtube is very …
Yes youtube is very very costly for me
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?
February 14th, 2010 at 12:06 pm
id hate to be one …
id hate to be one of the kids in that class!!!!!!!! bbbbbbbbbbbbbbbboooooooooooorrrrrrrrrrrrrrrrrrriiiiiiiiiiiiiiinnnnnnnnnnnnnngggggggggggggg
February 14th, 2010 at 12:06 pm
whats the answer …
whats the answer for the cranberry juice and the glass and the cardboard stuff?
February 14th, 2010 at 12:06 pm
Yes, thank you, …
Yes, thank you, that is indeed much easier to understand. Very cute problem anyway.
February 14th, 2010 at 12:06 pm
edit: gah typos
… 
that’s m(rock)/rho(water)…not minus
edit: gah typos
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.
February 14th, 2010 at 12:06 pm
edit: sorry, it is …
edit: sorry, it is not Pascal`s, but Archimedes` principle.