Re: The Questions thread

[cephalopodAscendant]

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.

[kotakun]

the barber is a woman thats the solution to the problem

[cephalopodAscendant]

Women shave their legs and armpits, don't they?

[OverlordJ]

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:

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.

Women shave their legs and armpits, don't they?

Not all of them, especially here in europe.

[cephalopodAscendant]

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.

[Shailsnic]

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.

[tinning3]

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.

[d_what]

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

[cephalopodAscendant]

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 C_s = 4.18 J/(g*°C), how much ice (in grams) at 0°C is needed to cool the tea to 12.0°C, given ΔH_fusion = 6.01 kJ/mol?

[kotakun]

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

[cephalopodAscendant]

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

[Gelatino]

thermodynamics is cool

but physics is cooler and that's why i take physics instead of chem

[Dregadude]

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.

[Gelatino]

physics is basically just a lot of calculus

i hope you like differentials

[Dregadude]

...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

[Gelatino]

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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