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Comments:
<0> DanF_DrC: why did you leave?
<0> your university?
<1> irbdavid: i think polylactic acid (PLA) is also really interesting :)
<1> but cant find anything like that inside my house
<2> hehe wow. some story
<3> yo
<2> is there a theoretical limit against a compressor heat transfer being great enough to drive itself?
<4> you mean a like a carnot engine?
<2> not familiar with that
<4> i think wiki's article is pretty good
<4> haven't checked it in a while though
<2> does it answer the question?
<4> i don't really understand the question
<2> seems the carnot is just the one half of the question
<2> you can transfer more heat energy using a compressor than it takes to power it
<2> question is, is it enough to power the process
<4> i'd ***ume not, b/c that would be a perpetual motion machine
<2> yes but ***umption is the mother of all ****ups
<4> so if i understand your system well enough
<4> you have a compressor (let's say a piston), and we are providing work to it
<4> is there enough thermal energy to in effect continue the compression?
<4> is that what you are asking?
<2> like an earth heat system, is the heat transfered enough to power the transfer
<2> for instance in my country such earth heat commercial systems exist for heating houses. drawing from a radiator in the ground where the ground is always 6c yeat heats the house to 20+ while being far more efficient than using the compression energy directly for heating
<2> yet*
<2> essentially free energy. you follow?
<2> off to bed
<4> sounds like a refrigerator
<4> sorry was grabbingf a sandwich
<4> but a carnot engine is the ideal
<2> np. same principle just in reverse. but there is more to it. teh self powering part
<4> you can do what you are talking aboutbut it's efficiency will be less than the carnot's
<2> what I am talking about is perpetual motion
<4> i know
<4> which is why i don't believe it
<4> like the topic says take it up w/ boltzmann
<2> hehe but he's dead
<4> i'm just starting statistical mechanics
<4> so you'll have to wait for me to prove it
<2> it's not about statistics. it's about understanding
<4> what year university are you?
<2> and if you don't dare to think for yourself I wont wait for you to tell me that it works :)
<2> I'm out. degree in comp sci. not physics
<4> ah
<4> what's the interest in physics then?
<5> there is interest in physics ?
<5> we should have it taken out and shot
<2> alunduil, UFOs
<4> lmao
<2> laugh it up fuzzball
<4> i'm trying to connect UFO's and perpetual motion machines is all
<5> well have you ever known stories about ufos to go away ?
<5> that's kinda perpetual :P
<5> i can make a perpetual motion machine easily :P
<2> trying to attack the problem of where current science has overlooked something vital
<2> http://www.df-cad.dk/web/ufo/Clinton95.avi
<5> sorry i do not have the internet here DanF_DrC
<2> I ***ure you it's very real. whether you can handle it or not
<4> i consider UFO's to be moot, sorry
<5> so i cannot view your video
<2> then stay ignorant
<5> pmsl
<4> i shall, but i will learn physics
<6> oh look, a new war
<7> huh
<7> what is it good for?
<6> lol
<8> hello... my beer, which comes in a regular 12 oz beer bottle, is 35 degrees fahrenheit coming out of the fridge, it's 80 degrees in the room, and the beer is best served at 50-54 degrees... how long should i leave it out before pouring?
<6> you want the diff eq or just a number
<8> hondje: i'd like to know the answer and how to figure it out
<6> look up newtons law of cooling
<6> it's a fairly simple ODE
<8> ok
<6> but, to solve it you need to check the temp at both t=0 and t=n, to figure out what t is when the beer is 50F
<8> does the formula take into account the shape of the thing?
<8> oh you're saying i need two data points to figure out the rate
<6> yeah
<8> right?
<6> yep
<8> k
<8> i have to get a thermometer then
<6> The shape is generally irrelevant unless you're obsessive about it
<8> what about if i blow a fan at it?
<8> how much diff does that make
<6> probably get dust in your beer
<6> You can take either a simple ODE, or you can make it a thermo cl*** final problem :-)
<9> come on people!
<9> Temperature change is exponential
<8> hondje: no dust, the caps still on
<8> JohnFlux: how would you solve it then?
<9> well you do indeed need a second data point :)
<6> So, what you do is this
<6> First, you open a beer and drink it to determine the temp
<9> noah: you can imagine that the rate it cools at will be different depending on how fast it cools
<6> then drink the second one, and note the time elapsed
<9> hondje: ;-)
<6> now take two shots of tequila - I prefer Patron, but you can go your own route here - and you won't care
<9> noah: uh
<9> noah: i mean that the rate it cools at will depend on how thick the gl*** is etc
<6> Same thing, really
<9> why 2 shots?
<9> noah: what you can do is find a physics student
<9> and say "here's a free bottle of beer. in return tell me how long it takes to reach 50-54 degrees"
<6> JohnFlux: Because you can't just have one shot of patron :)
<6> oh yeah, that's a good idea
<6> we'll do all sorts of stupid **** for beer
<6> or poon
<8> heh
<8> i doubt i can offer you poon
<8> this is beer you give away by the sip tho
<6> Why, is it special beer?
<8> yeah it's a fancy belgian style
<6> oh yeah? What's it called?
<6> New Belgian Brewery makes a nice one called Abbey, I highly recommend it to anyone west of the mississippi
<8> hondje: it's called hennepin
<8> brewed in cooperstown, ny
<10> humm
<11> yo
<10> anybody know about hovercraft here?
<10> I want to know how changing the area of the base is gonna affect how much weight it can lift.
<10> Would I be right in saying that to calculate velocity pressure in N/m squared you use the formula VP=0.6xV^2? In my case, VP = 0.6x77.7^2 = 3622.37 N/m^2 Is this the right formula to be using for what I'm after?
<12> hey...anyone alive?
<13> mefistofeles: no i died about 2 days ago
<12> ahh damn!
<12> couldn get here 2 days ago
<12> that sux
<12> JabberWalkie: do u know something about qed?
<13> mefistofeles: absoltely
<13> nothing
<12> heh
<12> well Im just starting
<12> with some feynman's lectures
<13> mefistofeles: ahh fun...
<12> JabberWalkie: do u study physics or something related?
<14> man...it's late
<13> genoobie: go to bed!
<14> okay oaky...nite!
<15> morning Jreggelt!
<16> Hi
<17> Hi.
<2> hi
<16> let's talk about neutron stars and their magnetic fields now!
<16> So, the neutron star rotates real fast, got a magnetic field the poles of which are off by some angle to the rotational axis
<16> there's the 'light radius', which is the radius at which an object that moves with the same angular velocity as the star would reach the speed of light
<16> I wonder, what happens to the magnetic field lines if they reach out to the light radius?
<2> there is no such thing as magnetic field lines
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