The Questions thread

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Re: The Questions thread

Post by cephalopodAscendant on Sat Sep 21, 2013 8:49 pm

Russell's Paradox is basically the question I asked: does the set of all sets that don't contain themselves contain itself? You can put it in different contexts, such as with a barber who shaves everyone that doesn't shave themselves and only people who don't shave themselves, but it all boils down to the same idea. If the set contains itself (the barber shaves himself), then by definition it can't contain itself (he can't shave himself); if it doesn't contain itself (he doesn't shave himself), then by definition it has to contain itself (he has to shave himself). It's only one of the most famous mathematical paradoxes ever. Next you'll be telling me you don't know what Cantor's Diagonal argument for the uncountability of the real numbers is.
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Re: The Questions thread

Post by kotakun on Sat Sep 21, 2013 8:54 pm

the barber is a woman thats the solution to the problem
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Re: The Questions thread

Post by cephalopodAscendant on Sat Sep 21, 2013 8:54 pm

Women shave their legs and armpits, don't they?
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Re: The Questions thread

Post by OverlordJ on Sat Sep 21, 2013 8:55 pm

cephalopodAscendant wrote:Russell's Paradox is basically the question I asked: does the set of all sets that don't contain themselves contain itself? You can put it in different contexts, such as with a barber who shaves everyone that doesn't shave themselves and only people who don't shave themselves, but it all boils down to the same idea. If the set contains itself (the barber shaves himself), then by definition it can't contain itself (he can't shave himself); if it doesn't contain itself (he doesn't shave himself), then by definition it has to contain itself (he has to shave himself). It's only one of the most famous mathematical paradoxes ever. Next you'll be telling me you don't know what Cantor's Diagonal argument for the uncountability of the real numbers is.
Except that wasn't what Nintenerd asked:

NinteNerd wrote:does a set of all sets contain itself?
A set of all sets is not the same as a set of all sets that don't contain themself.

cephalopodAscendant wrote:Women shave their legs and armpits, don't they?
Not all of them, especially here in europe.
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Re: The Questions thread

Post by cephalopodAscendant on Sat Sep 21, 2013 9:03 pm

cephalopodAscendant wrote:Gelatino, I'm ashamed of you. You didn't mention Russell's Paradox at all. I gave you the perfect opening and everything.
That's because I asked Gelatino on his tumblr, because I thought he was cool BUT HE ISN'T. And I know that not all women shave their legs and/or armpits; something about kotakun just makes me not care that much about giving a rigorous, thorough answer. Here's how it works: oversimplified argument goes in, oversimplified rebuttal comes out.
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Re: The Questions thread

Post by Shailsnic on Sun Sep 22, 2013 12:31 pm

Would you rather be forced to wear a full face mask and never take it off if offered a one-time payment of $50,000, or wear shoes on your hands for that same amount of money? No, you are not allowed to take those shoes off.
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Re: The Questions thread

Post by tinning3 on Sun Sep 22, 2013 1:29 pm

Hands are pretty important for day to day activites, which would be hampered by the addition of shoes, while masks can look pretty cool if you choose the right one, if uncomfortable after a while, so the mask would definatly win out.
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Re: The Questions thread

Post by d_what on Sun Sep 22, 2013 1:57 pm

50 grand? Hell naw. You'd be unemployable.

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Re: The Questions thread

Post by cephalopodAscendant on Thu Nov 07, 2013 9:52 pm

Okay serious question time, because I think the website my Chemistry class uses for homework is being brain-dead again. WHEN WILL THEY LEARN TO DOUBLE-CHECK THE WORK THEIR UNPAID INTERNS DO OH RIGHT I HAD AN ACTUAL QUESTION. So, given 372.0g of tea at 74.0°C with Cs = 4.18 J/(g*°C), how much ice (in grams) at 0°C is needed to cool the tea to 12.0°C, given ΔHfusion = 6.01 kJ/mol?
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Re: The Questions thread

Post by kotakun on Thu Nov 07, 2013 10:20 pm

mass of tea times change in temperature times specific heat of water
equals
mass of ice times quantity
enthalpy of fusion per gram plus change in temperature times specific heat of water
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Re: The Questions thread

Post by cephalopodAscendant on Thu Nov 07, 2013 10:50 pm

Oh derp. I forgot to factor in the melted ice. Okay, so it wasn't the site being stupid this time.
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Re: The Questions thread

Post by Gelatino on Sat Nov 09, 2013 4:35 pm

thermodynamics is cool

but physics is cooler and that's why i take physics instead of chem
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Re: The Questions thread

Post by Dregadude on Sat Nov 09, 2013 6:05 pm

Taking physics for the first time next quarter, not sure how much I'm going to understand. Hopefully my math and chemistry background will carry me through.
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Re: The Questions thread

Post by Gelatino on Sat Nov 09, 2013 6:18 pm

physics is basically just a lot of calculus

i hope you like differentials
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Re: The Questions thread

Post by Dregadude on Sat Nov 09, 2013 6:26 pm

...i don't remember any of the differential rules :c

all we're doing in calculus is power series and parametrics, we're supposed to remember derivatives and integrals from high school

which i don't
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Re: The Questions thread

Post by Gelatino on Sat Nov 09, 2013 6:50 pm

i don't think you need to know necessarily all the rules to taking derivatives and integrals.  my class uses a chart showing the antiderivatives of any difficult functions so we don't have to do the work.

however, there is a lot of definite integration and you'll probably need to play with differentials a lot.  for example, when a problem gives you velocity in terms of displacement so you have to turn dv/dx into dv/dt.  it's kind of hard to remember how to do stuff like that.

yesterday, i had an extra credit problem on a test which asked for the center of mass of a disc with a smaller circle cut out of it.  i didn't finish, but i think i was on the right track.
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