Search found 289 matches

by danpilon54
Thu Sep 04, 2008 7:33 pm UTC
Forum: Science
Topic: Relativity: Length Contraction
Replies: 9
Views: 1268

Re: Relativity: Length Contraction

I'm sure there is a better explanation for why there is length contraction, but I always liked how simple this one is:

If you accept time dilation, you must have length contraction because the speed of light must remain c. Speed is m/s so if seconds change so much meters.
by danpilon54
Thu Sep 04, 2008 4:51 pm UTC
Forum: Science
Topic: Should You Patent Science Projects?
Replies: 7
Views: 1409

Re: Should You Patent Science Projects?

^what they said I currently have a patent pending on a material I designed during my research. We are publishing the findings, but wish to patent the material itself before somebody else does, and we can't do anything with it anymore. Definitely don't go into too much detail about a serious science ...
by danpilon54
Thu Sep 04, 2008 4:48 pm UTC
Forum: Science
Topic: do electron orbitals have finite volume?
Replies: 12
Views: 1719

Re: do electron orbitals have finite volume?

I wouldn't be surprised if it was less likely. O and the earth can't just cease to exist (unless you annihilate it with antimatter), but all of the particles that make up the earth could just go to different spots. [/technicality]
by danpilon54
Thu Sep 04, 2008 4:45 pm UTC
Forum: Science
Topic: [Physics] Time Travel
Replies: 70
Views: 7783

Re: [Physics] Time Travel

probably because its far enough back in time to be a cool form of time travel, but not so far so that killing the person would have definite effects on your existence.
by danpilon54
Thu Sep 04, 2008 4:43 pm UTC
Forum: Science
Topic: Invisibilty "Cloaks"
Replies: 14
Views: 1617

Re: Invisibilty "Cloaks"

yea the main problem right now is size limitations on engineering the materials. We have fairly good accuracy to about 1um but smaller than that (like for visible light) is currently not possible. Therefore, a visible light cloak is not currently possible, even though one could be designed.
by danpilon54
Wed Sep 03, 2008 10:26 pm UTC
Forum: Science
Topic: Invisibilty "Cloaks"
Replies: 14
Views: 1617

Re: Invisibilty "Cloaks"

My group is using them to create optics designed for the terahertz regime. Basically, there is a terahertz gap in normal materials where they simply do not optically react very well to terahertz frequencies. So far we have made absorbers and birefringent materials along with other kinds of optics. I...
by danpilon54
Wed Sep 03, 2008 10:23 pm UTC
Forum: Science
Topic: What does the Atom look like?
Replies: 32
Views: 7246

Re: What does the Atom look like?

the speed of light isn't a "speed limit" in this case. People have "teleported" electrons "faster" than light before using tunneling. Its not that the electron moves faster than light, its that you measure it in one spot at time t1 and another at time t < t1+x/c where x...
by danpilon54
Wed Sep 03, 2008 3:14 pm UTC
Forum: Food
Topic: Hummus + x = delicious. Solve for x.
Replies: 96
Views: 10419

Re: Hummus + x = delicious. Solve for x.

I sometimes just replace mustard/mayo on a sandwich with hummus. Its amazing especially if its garlic hummus.

Eating chipotle hummus with crackers right now actually.
by danpilon54
Wed Sep 03, 2008 3:07 pm UTC
Forum: Science
Topic: What does the Atom look like?
Replies: 32
Views: 7246

Re: What does the Atom look like?

It is meaningless to talk about the transition time between energy levels. Basically you can measure the electron and find it in 1 energy level. You can measure it later and find it in a different one. You can't watch in between measurements. Before your measurement the electron doesnt really exist ...
by danpilon54
Wed Sep 03, 2008 3:03 pm UTC
Forum: Science
Topic: do electron orbitals have finite volume?
Replies: 12
Views: 1719

Re: do electron orbitals have finite volume?

as in would not happen in the age of the universe small.
by danpilon54
Wed Sep 03, 2008 2:59 pm UTC
Forum: Science
Topic: Invisibilty "Cloaks"
Replies: 14
Views: 1617

Re: Invisibilty "Cloaks"

I do research in metamaterials and a negative index is most certainly possible. It makes the light left-handed and the phase velocity is negative, but the light still travels at speed c/|n|. A negative index is achieved by tuning the electric and magnetic response of a material such that epsilon and...
by danpilon54
Tue Sep 02, 2008 5:57 pm UTC
Forum: Forum Games
Topic: Six-word Acronym Game
Replies: 27
Views: 2192

Re: Six-word Acronym Game

Right now seven orange gorillas mate

T W N E S E
by danpilon54
Wed Aug 27, 2008 3:03 am UTC
Forum: Science
Topic: HS chem question: Velocity and wavelength w.r.t. photons
Replies: 30
Views: 5052

Re: HS chem question: Velocity and wavelength w.r.t. photons

photons can travel at .01c if they are in a material with refractive index 100, but the question cannot be answered. The frequency of a photon is not determined by its velocity. E=mc^2 only applies to objects with rest mass. Basically your chem teacher has a very limited understanding of physics.
by danpilon54
Sun Aug 24, 2008 1:32 am UTC
Forum: Science
Topic: Graduate Program help!
Replies: 39
Views: 4227

Re: Graduate Program help!

is that half right half wrong or half right half blank?

if its the latter I was misinformed.
by danpilon54
Sat Aug 23, 2008 11:04 pm UTC
Forum: Science
Topic: Graduate Program help!
Replies: 39
Views: 4227

Re: Graduate Program help!

Yea I havent even cared to think about the general gre yet. Apparently on the physics one, you can answer half correct and leave half blank and still do exceptionally well percentage wise.
by danpilon54
Fri Aug 22, 2008 6:16 pm UTC
Forum: Science
Topic: DINOSAURS!
Replies: 31
Views: 4993

Re: DINOSAURS!

Ah sorry gmalivuk I must have missed that.
by danpilon54
Fri Aug 22, 2008 4:15 pm UTC
Forum: Science
Topic: DINOSAURS!
Replies: 31
Views: 4993

Re: DINOSAURS!

about the moon thing. Assuming it was created by a massive collision, a collision that size would have liquefied the entire earth. I dont think any life survived that. Luckily it happened near the creation of the earth so life probably didnt exist yet anyway.
by danpilon54
Fri Aug 22, 2008 4:01 pm UTC
Forum: Science
Topic: Favorite Perpetual Motion Machines
Replies: 105
Views: 12340

Re: Favorite Propetual Motion Machines

I think what's going on is you're assuming only pure water can go through the membrane on the bottom and only salt water on the top. Wouldn't pure water diffuse through the top membrane in the same way as the bottom membrane? Gravity will push water from the salt side through the membrane, and diffu...
by danpilon54
Mon Aug 18, 2008 9:09 pm UTC
Forum: Science
Topic: Childhood (not so) crackpot theories
Replies: 435
Views: 72998

Re: Childhood crackpot theories

I don't know about people, but Im sure the size of an animal has an effect on their experiencing of time. Imagine experience time like a human but living only for a day (fruitfly).
by danpilon54
Mon Aug 18, 2008 4:11 pm UTC
Forum: Food
Topic: How do you take your coffee? (Or tea)
Replies: 106
Views: 8965

Re: How do you take your coffee? (Or tea)

Thanks felstaff I kept having to look back through the post to find those. They are doozies :P
by danpilon54
Fri Aug 15, 2008 6:12 pm UTC
Forum: Science
Topic: Colonization of Mars
Replies: 6
Views: 1267

Re: Colonization of Mars

short answer: Too much trouble to be worth it. Long(er) answer: The gravity on mars is very low so it wouldn't be possible to maintain a dense enough atmosphere without contained environments in bubbles. Another problem is the whole setting up of an ecosystem. There have been experiments done on ear...
by danpilon54
Thu Aug 14, 2008 3:31 am UTC
Forum: Gaming
Topic: How old is your brain OR Is there a subform for flash games?
Replies: 24
Views: 2490

Re: How old is your brain OR Is there a subform for flash games?

22 first try. Didnt try again. Guess it works cuz Im 21.
by danpilon54
Wed Aug 13, 2008 6:00 pm UTC
Forum: Science
Topic: Simple E&M question
Replies: 9
Views: 1469

Re: Simple E&M question

bah youre right sometimes my brain doesn't work.
by danpilon54
Tue Aug 12, 2008 8:00 pm UTC
Forum: Science
Topic: Simple E&M question
Replies: 9
Views: 1469

Re: Simple E&M question

Puck wrote:An electric field has a magnitude and a direction at any point. To find the magnitude of the field at the origin, you need only the distance and charges of the relevant particles. If you also want the direction of the field, you need the charge locations.


yup
by danpilon54
Tue Aug 12, 2008 7:02 pm UTC
Forum: Science
Topic: IB Extended Essay ~ need ideas =P
Replies: 20
Views: 11220

Re: IB Extended Essay ~ need ideas =P

To add to the confusion, assuming a single time-line, even if you went back to correct yourself, you would fail, because history has shown that you did not correct yourself. So try as you might something will stand in your way. This may seem like it violates free will, but its no different than sayi...
by danpilon54
Tue Aug 12, 2008 6:55 pm UTC
Forum: Science
Topic: Simple E&M question
Replies: 9
Views: 1469

Re: Simple E&M question

Possibly the angles are given as part of the question by their representation in the diagram? There is nothing about the system that would make stable positions for the charges, but you do need to know the positions of the charges to find the electric field at the origin.
by danpilon54
Mon Aug 11, 2008 7:37 pm UTC
Forum: Science
Topic: Can light be bent?
Replies: 46
Views: 5753

Re: Can light be bent?

I think he did 10->1 instead of 1->10, but this way it shows light bending at an interface and light bending due to an index gradient.
by danpilon54
Mon Aug 11, 2008 4:03 pm UTC
Forum: Science
Topic: Physics Tattoo Ideas
Replies: 63
Views: 17537

Re: Physics Tattoo Ideas

http://farm4.static.flickr.com/3070/2729883411_bb10b8d5ef_o.jpg i keep this one in a special place What is that? The, er, mass of the body at the middle of something's orbit maybe? looks to be a magnetization in statistical mechanics. I always hated stat mech, and even more so because its so damned...
by danpilon54
Fri Aug 08, 2008 2:16 am UTC
Forum: Science
Topic: Desalinization
Replies: 12
Views: 1472

Re: Desalinization

if the sun alone could evaporate water that quickly there wouldnt exactly be a lot of liquid water on the earth.
by danpilon54
Thu Aug 07, 2008 8:53 pm UTC
Forum: Science
Topic: Recent thread re engineers and creationism?
Replies: 76
Views: 6255

Re: Recent thread re engineers and creationism?

physics BA does so count. They don't even offer physics BS at BU (where I go), and I can assure you their BA program is as involved and absurdly difficult as any BS program out there. IMO it's all semantics. Also, Ive had many many grad engineers in my undergrad/grad math courses (they were 500 lev...
by danpilon54
Thu Aug 07, 2008 8:49 pm UTC
Forum: Science
Topic: Desalinization
Replies: 12
Views: 1472

Re: Desalinization

I think the problem is that evaporating a shit ton of water is not that easy without a large heat source, which is by nature pretty inefficient. Not sure of any other methods.
by danpilon54
Thu Aug 07, 2008 8:46 pm UTC
Forum: General
Topic: The 'it hurts my brain' thread
Replies: 81
Views: 7332

Re: The 'it hurts my brain' thread

the onion heals all of my aches and pains
by danpilon54
Thu Aug 07, 2008 3:09 pm UTC
Forum: Science
Topic: Recent thread re engineers and creationism?
Replies: 76
Views: 6255

Re: Recent thread re engineers and creationism?

physics BA does so count. They don't even offer physics BS at BU (where I go), and I can assure you their BA program is as involved and absurdly difficult as any BS program out there. IMO it's all semantics. Also, Ive had many many grad engineers in my undergrad/grad math courses (they were 500 leve...
by danpilon54
Thu Aug 07, 2008 2:08 pm UTC
Forum: General
Topic: The 'it hurts my brain' thread
Replies: 81
Views: 7332

Re: The 'it hurts my brain' thread

bridge wrote:Just an example to give you the idea of what i'm talking about: The Darwin Conspiracy



O god why do I keep going to these websites and ruining my day...
by danpilon54
Thu Aug 07, 2008 1:45 pm UTC
Forum: Science
Topic: What do you think we will see at the LHC?
Replies: 160
Views: 20309

Re: Question about the Large Hadron Collider

B field induced by moving charged particles is inherantly relativistic, so you're probably correct the first time.
by danpilon54
Thu Aug 07, 2008 5:00 am UTC
Forum: Science
Topic: glow in the dark crab claw no joke guys what is this
Replies: 9
Views: 1696

Re: glow in the dark crab claw no joke guys what is this

not sure, but try luminescent?
by danpilon54
Thu Aug 07, 2008 2:46 am UTC
Forum: Science
Topic: Graduate Program help!
Replies: 39
Views: 4227

Re: Graduate Program help!

about the units thing, I've heard that you used to be able to do that, but they've changed it so all the answers have the same units. I confirm this my class did a few practice exams for a baseline analysis of our skills and all the answers had the same units. Most differed by a constant here and th...
by danpilon54
Thu Aug 07, 2008 2:42 am UTC
Forum: Science
Topic: Favorite Scientist?
Replies: 84
Views: 9222

Re: Favorite Scientist?

yea but at least everyone I know who has done statistical mechanics hates it with fiery passion, and they hate it all the more because it's so damn useful :P
by danpilon54
Wed Aug 06, 2008 10:19 pm UTC
Forum: Science
Topic: Favorite Scientist?
Replies: 84
Views: 9222

Re: Favorite Scientist?

I picked maxwell for his contributions to science, rather than base it on personality. Not that the others didn't contribute, but after studying e&m for a full year at the 400 level, I have grown to greatly appreciate maxwell's equations and realise how beautiful they are. Not to mention they ar...
by danpilon54
Wed Aug 06, 2008 10:15 pm UTC
Forum: Science
Topic: Graduate Program help!
Replies: 39
Views: 4227

Re: Graduate Program help!

Im with you hitokiriilh. Im so worried about the physics gre that I couldn't care less about the regular one. How is answering 100 multiple choice physics questions with little more than 1 minute per question a good measure of my physics abilities? You have to memorize formulas just to answer the qu...

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