Search found 17 matches

Mon Nov 17, 2008 9:13 pm UTC
Forum: Science
Replies: 39
Views: 4301

The moral of the story: It doesn't matter what your project is. It doesn't matter what school you go to. It doesn't matter what your data is, and it doesn't matter who opposes you. All that matters is who your advisor is. Find a lab with scads of money and you've found a lion. Money doesn't make a ...
Mon Nov 17, 2008 8:19 pm UTC
Forum: Science
Topic: Leonid meteor shower
Replies: 0
Views: 601

Leonid meteor shower

Anyone catch this year's Leonid meteor shower? And if you did, was it good or not? Apparently the peak was this morning, and I, of course, forgot about it. I'm debating whether or not its worth the effort tonight to stay up late and drive far from the city's lights. We have a bright moon so I'm just...
Fri Nov 07, 2008 8:16 pm UTC
Forum: Science
Topic: Flying Flowerpot Problem
Replies: 7
Views: 1150

Re: Flying Flowerpot Problem

I'm not sure why this would take you 25 minutes, as it's basic algebra, or why you need the third equation you posted. Formula 1: Find the velocity of the flower pot at the bottom of the window. We know it took 0.25s to cross the window on the way up. s = V_0*t + 1/2*a*t^2 s = 1m, t = 0.25s, a = -9...
Fri Nov 07, 2008 7:39 pm UTC
Forum: Gaming
Topic: Unknown Armies
Replies: 4
Views: 1109

Re: Unknown Armies

Many years ago, my friends and I played some 1st edition Unknown Armies. It was easily one of the best campaigns we've done. The setting and system are great. Its a great system if you like a bit of laughing and silliness along with your gaming. I bought the 2nd edition book and am dying to try it o...
Fri Nov 07, 2008 7:13 pm UTC
Forum: Music
Replies: 29
Views: 2838

Slightly off-topic: I've heard that Death Magnetic, because of the way it was mastered, sounds like shit; but the Guitar Hero version of the album is mastered perfectly. Anyone know anything about this? Yes! I have not heard the album, and not being a Metallica fan (beyond a few songs) I don't have...
Wed Nov 05, 2008 8:52 pm UTC
Forum: Science
Topic: Actual Physics Research
Replies: 31
Views: 4104

Re: Actual Physics Research

Conducting research often just has you learning a bunch of things you just don't, and can't, learn in the classroom. I do Raman spectroscopy, and I basically built my system from the ground up. We had a microscope, a spectrometer, a CCD detector, and a laser that I needed to get working together to ...
Wed Oct 22, 2008 11:28 pm UTC
Forum: Science
Topic: changing acceleration
Replies: 27
Views: 2718

Re: changing acceleration

Your integration gives us the potential energy, well the potential, V, but U = mV. This is why we also use energy to solve problems. :) Conservation of energy. E = KE + PE = 1/2 m v^2 - GMm/r lets say starts at rest and at some r = a. Ei = -GMm/a Ef = 1/2 m v^2 - GMm/r Ei = Ef. Solve for v! Simple m...
Wed Oct 22, 2008 9:18 pm UTC
Forum: Food
Topic: The Xkcd Cookbook (with an unfinished index in the OP)
Replies: 686
Views: 282487

Re: The Xkcd Cookbook

Super Easy Brats and Sauerkraut Ingredients: 1 beer, 2 brats, sauerkraut, cheese, hot dog buns Pour beer in small saucepan, and put in brats and sauerkraut. Cook over medium heat until beer boils away. This takes a while, though you could probably speed it up by drinking some of the beer beforehand...
Wed Oct 22, 2008 8:06 pm UTC
Forum: Science
Topic: Magnifying red dot sight (optics)
Replies: 14
Views: 2284

Re: Magnifying red dot sight (optics)

Use a beamsplitter in place of L1. Set it at 45 degrees and mount the LED above the beamsplitter. T light goes straight through the beamsplitter to your eyes. And LED light reflects off the beamsplitter and also goes to your eyes. I'm not sure how well this would work as a "laser sight." I...
Wed Oct 22, 2008 7:52 pm UTC
Forum: Science
Topic: Gravitational potential energy (wtf?)
Replies: 18
Views: 2336

Re: Gravitational potential energy (wtf?)

Now, as to your question: If you say, have a ball suspended between two planets such that the gravitational fields from each of the planets cancelled out so the ball experienced no net force, then yes, the ball would have a gravitational potential energy. It _always_ has one. It may be convenient t...
Wed Oct 22, 2008 7:05 pm UTC
Forum: Science
Topic: What is the difference between momentum and kinetic energy?
Replies: 11
Views: 7327

Re: What is the difference between momentum and kinetic energy?

We're learning about hese in class, and the truth is I have no idea why they should be differen. Shouldn't two colliding objects ansfer energy? Yes, but momentum is not energy. One of the things to remember about physics is that we are defining terms, such as momentum and energy, to be very specifi...
Thu Oct 16, 2008 12:07 am UTC
Forum: Science
Topic: Physics vs. Comp Sci -- Help
Replies: 15
Views: 2101

Re: Physics vs. Comp Sci -- Help

Quantum Cryptography. :) Just saw an article on dailytech the other day about Quantum Encryption http://www.dailytech.com/Working+Quantum+Encryption+System+Hailed+as+Unbreakable/article13164.htm Computational methods in physics are huge. Just do a search on sciencedirect for papers on computational,...
Wed Oct 15, 2008 6:05 pm UTC
Forum: Music
Topic: Guitar Tunings
Replies: 35
Views: 3463

Re: Guitar Tunings

I have one of my guitars tuned down 2 steps to C, and it's become my favorite tuning. I use some heavy gauge strings (13-56) on it, and had the guitar professionally intonated at the tuning, as it was slightly off on the higher frets. It's popular among melodic death metal. Many metal bands even use...
Wed Oct 15, 2008 4:58 pm UTC
Forum: Science
Topic: Linear algebra
Replies: 14
Views: 2212

Re: Linear algebra

Crystallography... Group theory, Matrices, transformations, representations, and characters galore!
Wed Oct 15, 2008 4:45 pm UTC
Forum: Science
Topic: Temperature of beer in freezer as a function of time
Replies: 16
Views: 9975

Re: Temperature of beer in freezer as a function of time

Well that would be similar to the hand, so conductive heat flow would be predominant. So yes, the Aluminum would cool down faster.
Tue Oct 14, 2008 9:15 pm UTC
Forum: Science
Topic: Temperature of beer in freezer as a function of time
Replies: 16
Views: 9975

Re: Temperature of beer in freezer as a function of time

Sorry to bump an old post, but for some reason I was googling the aluminum versus glass bottle subject today, and I just found this paper. These guys did a formal experiment. http://www.informaworld.com/index/791665935.pdf (sorry, breaking the 5 posts till link postage rule, be kind on me) Similar t...
Tue Oct 14, 2008 8:55 pm UTC
Forum: Science
Topic: Physics Work
Replies: 6
Views: 1401

Re: Physics Work

Is that exactly how the question is worded? Because to me, it sounds like the 500m is the hypotenuse of your hill, which would then be your usual 3,4,5 triangle. So then your angle should be arcsin(3/5). Other than that, everything looks correct.