Search found 21 matches

by ChicagoPianoTuner
Wed Jul 06, 2011 10:48 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0921: "Delivery Notification"
Replies: 93
Views: 20125

Re: 0921: "Delivery Notification"

LTK wrote:Let me be the first to ask.... What?

Main character doesn't receive laptop delivery despite being home, plans to set out on quest to find package, asks for elves to make sword, sits at home and misses delivery of elven sword despite being home.
by ChicagoPianoTuner
Fri Feb 04, 2011 2:18 pm UTC
Forum: Science
Topic: Being a Physics Major
Replies: 12
Views: 2980

Re: Being a Physics Major

I'm currently doing Physics but I'm concerned that a) it's going to get far too hard. I'm already lost in some of the lectures intended to be school revision, in the first year and b) there's no job opportunities compared to something like Engineering. Research doesn't pay anything (in the UK at le...
by ChicagoPianoTuner
Sat Jan 29, 2011 7:53 pm UTC
Forum: Science
Topic: Being a Physics Major
Replies: 12
Views: 2980

Re: Being a Physics Major

OP, your post doesn't have any questions. Was there anything in particular you were curious about? Being a physics major was a great decision for me. My recommendations would be this: -Try to make friends with people in your course as soon as possible. You can, of course, do everything in all four y...
by ChicagoPianoTuner
Wed Jan 26, 2011 2:13 pm UTC
Forum: Science
Topic: Thermodynamics Questions
Replies: 13
Views: 2470

Re: Thermodynamics Questions

I agree with you that the problem does not explicitly state that the expansion/compression is adiabatic, but my point was that it is not unreasonable to make the assumption that it is, given a small change in volume. I believe it is unsolvable otherwise (in closed form), though I would love to be pr...
by ChicagoPianoTuner
Tue Jan 25, 2011 1:42 pm UTC
Forum: Science
Topic: Thermodynamics Questions
Replies: 13
Views: 2470

Re: Thermodynamics Questions

PV^gamma=constant holds for adiabatic compression or expansion of ideal gases. Adiabatic means no energy enters or leaves the system by heat (Q=0). At least I'm pretty sure that's accurate. I'm also pretty sure it describes this problem.
by ChicagoPianoTuner
Tue Jan 25, 2011 4:09 am UTC
Forum: Science
Topic: Thermodynamics Questions
Replies: 13
Views: 2470

Re: Thermodynamics Questions

Just figured it out. Need to use PV^gamma=constant. Taylor expand and then use N2L. Post again if you're still having trouble. Tricky problem!
by ChicagoPianoTuner
Mon Jan 24, 2011 11:35 pm UTC
Forum: Science
Topic: Thermodynamics Questions
Replies: 13
Views: 2470

Re: Thermodynamics Questions

To find the frequency, try to use Newton's second law, where the force due to the pressure of the gas in the cylinder depends on how far it is depressed. When you do, you'll be left with a familiar differential equation that you can solve to find the frequency. Edited to say that this method should ...
by ChicagoPianoTuner
Mon Jan 24, 2011 11:28 pm UTC
Forum: Science
Topic: Thermodynamics Questions
Replies: 13
Views: 2470

Re: Thermodynamics Questions

Just write the volume in each case as cross-sectional area (A) times the relevant height. Work through the problem symbolically, and the area should cancel out. Pretty sure the area doesn't cancel out, but you can indeed solve for it given the initial conditions: you know the moles of gas at STP, h...
by ChicagoPianoTuner
Tue Jan 11, 2011 2:26 pm UTC
Forum: Science
Topic: Completely elastic collision
Replies: 4
Views: 887

Re: Completely elastic collision

One more thing: the equation your professor derived (the one I just showed above) is not, on its own, sufficient to solve the question posed to you since you only have two of the four terms. It's likely that you professor intended for you to solve the problem by "traditional" conservation ...
by ChicagoPianoTuner
Tue Jan 11, 2011 2:23 pm UTC
Forum: Science
Topic: Completely elastic collision
Replies: 4
Views: 887

Re: Completely elastic collision

The Wikipedia page, while trying to make things easier mathematically, makes them more confusing conceptually by changing the reference frame. I'll give you the basic steps to showing how your professor got that equation. First, realize that the kinetic energy of the two masses is conserved in a com...
by ChicagoPianoTuner
Thu Dec 16, 2010 8:16 pm UTC
Forum: Science
Topic: Atomic radius of ions vs elements
Replies: 16
Views: 2536

Re: Atomic radius of ions vs elements

I wasn't exactly talking about up and down in the literal sense but to get you thinking that the poles are oriented and located opposite each other in electrons according to the uncertainty principle (since we can't even pin-point electrons at any certain space at a given time but approximate where...
by ChicagoPianoTuner
Thu Dec 16, 2010 4:50 pm UTC
Forum: Science
Topic: Atomic radius of ions vs elements
Replies: 16
Views: 2536

Re: Atomic radius of ions vs elements

The Pauli Exclusion principle talks about different quantum energy levels of electrons, I am talking more about electron spins of individual electrons and how one is up and the other is down. I am taking it a step further into discussing why the spins are the opposite ways. Have you considered how ...
by ChicagoPianoTuner
Fri Dec 10, 2010 3:55 am UTC
Forum: Science
Topic: Rotation on a ramp: find my mistake!
Replies: 4
Views: 1116

Re: Rotation on a ramp: find my mistake!

Yes, that's true. I though about the same thing on my drive home from work. I haven't thought about the parallel axis theorem in a while.
by ChicagoPianoTuner
Thu Dec 09, 2010 10:35 pm UTC
Forum: Science
Topic: Rotation on a ramp: find my mistake!
Replies: 4
Views: 1116

Re: Rotation on a ramp: find my mistake!

Wow, you're absolutely right. I didn't verify your integral, but that is indeed the error in my logic. I'll check it when I get home from work. Thanks!
by ChicagoPianoTuner
Thu Dec 09, 2010 8:33 pm UTC
Forum: Science
Topic: Rotation on a ramp: find my mistake!
Replies: 4
Views: 1116

Rotation on a ramp: find my mistake!

http://www.batesville.k12.in.us/physics/phynet/mechanics/RotMechanics/images/roll_1.gif A pretty common physics problem is finding the speed of a rigid body as it travels down a ramp of height "h" (not labeled in the drawing, sorry). The easiest way to find the velocity at, say, the botto...
by ChicagoPianoTuner
Thu Dec 09, 2010 2:36 pm UTC
Forum: Science
Topic: Can someone explain the joke?
Replies: 16
Views: 3036

Re: Can someone explain the joke?

"Theorists are strange" is what you'd get if you replaced every small Greek letter with the first letter of the English word for the Greek letter. "O" for "omega," "S" for "sigma," and so on. It has nothing to do with a mapping of one alphabet to the...
by ChicagoPianoTuner
Tue Nov 23, 2010 12:40 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0823: "Guest Week: David Troupes (Buttercup Festival)"
Replies: 26
Views: 14431

Re: 0823: "Guest Week: David Troupes (Buttercup Festival)"

LET'S RIOT BECAUSE THE HAIR IS DIFFERENT.

I liked this one a lot.
by ChicagoPianoTuner
Sat Jun 19, 2010 1:10 pm UTC
Forum: Mathematics
Topic: Fun math questions for (relative) beginners
Replies: 9
Views: 1884

Re: Fun math questions for (relative) beginners

Thanks for the suggestions, team. I like the game theory approach, and it seems like something that's pretty graspable. If anyone has any other puzzle-type things, I'd be very interested to hear them.
by ChicagoPianoTuner
Fri Jun 18, 2010 1:32 am UTC
Forum: Mathematics
Topic: Fun math questions for (relative) beginners
Replies: 9
Views: 1884

Re: Fun math questions for (relative) beginners

orangeperson, thanks very much. The second problem is EXACTLY like what I'm looking for. It doesn't have to be algebra based; just some sort of basic logical reasoning. Thanks for the link too, those are neat, though we're not quite to that point. I might cut out some cardboard for the pythagorean t...
by ChicagoPianoTuner
Thu Jun 17, 2010 10:50 pm UTC
Forum: Mathematics
Topic: Fun math questions for (relative) beginners
Replies: 9
Views: 1884

Re: Fun math questions for (relative) beginners

Tiran, thanks for the suggestions. I like those, but they sound pretty similar to a lot of standard word problems. I do appreciate the approach you took, especially with the first problem. Talith, while that's a neat problem, I would wager it's unlikely to be solved (or even seriously pursued) by st...
by ChicagoPianoTuner
Thu Jun 17, 2010 8:09 pm UTC
Forum: Mathematics
Topic: Fun math questions for (relative) beginners
Replies: 9
Views: 1884

Fun math questions for (relative) beginners

Hello math fans, I tutor math and physics for a living, and all too often I encounter students who are jaded by the traditional curriculum. As a tutor, I am often put in a difficult spot between wanting to show students the beauty in the math/science and helping them with their homework (which is us...

Go to advanced search