Search found 289 matches

by danpilon54
Wed Oct 29, 2008 6:38 pm UTC
Forum: Science
Topic: If life were to evolve on Earth again
Replies: 42
Views: 4544

Re: If life were to evolve on Earth again

You make a good point. Just thought Id throw it out there.
by danpilon54
Wed Oct 29, 2008 5:34 pm UTC
Forum: Science
Topic: If life were to evolve on Earth again
Replies: 42
Views: 4544

Re: If life were to evolve on Earth again

You are certainly correct here. We are most certainly not in anything like a 'stable' point. Along those lines, is stability even possible ? Natural selection rewards species that can cause an instability that's beneficial to themselves. If mice became poisonous, there's nothing in the system that ...
by danpilon54
Sat Oct 25, 2008 11:23 pm UTC
Forum: Science
Topic: Finding motivation
Replies: 4
Views: 1087

Re: Finding motivation

confirmed, at least in my opinion.
by danpilon54
Sat Oct 25, 2008 2:39 am UTC
Forum: Science
Topic: Finding motivation
Replies: 4
Views: 1087

Re: Finding motivation

Well unless you want to do theory, physics isn't about doing problems. Try to get into some research and you'll get to see what physicists actually do. I wouldn't worry. I don't think anyone is really into doing homework, but I love my research and it confirms that I want to do physics for my career.
by danpilon54
Fri Oct 24, 2008 2:53 pm UTC
Forum: Science
Topic: You might be a physics major if...
Replies: 540
Views: 62641

Re: You might be a physics major if...

KyleOwens wrote:You are constantly hatting your i's and crossing your h's


So true. I was recently doing an E&M problem that involved a height h. When I was done I realized I had crossed every h...
by danpilon54
Fri Oct 24, 2008 5:19 am UTC
Forum: Science
Topic: You might be a physics major if...
Replies: 540
Views: 62641

Re: You might be a physics major if...

roundedge wrote:An assignment with 4 questions is more than an evening's worth of homework.


Oh me yarm this atm. I just spent from 6 to midnight doing 1 problem. 1 problem!
by danpilon54
Thu Oct 23, 2008 7:31 pm UTC
Forum: Science
Topic: You might be a physics major if...
Replies: 540
Views: 62641

Re: You might be a physics major if...

Ratio wrote:You know you're a Physics Major if you punch anyone who says the LHC could end the world.


fix'd
by danpilon54
Thu Oct 23, 2008 1:43 am UTC
Forum: Science
Topic: Gravitational potential energy (wtf?)
Replies: 18
Views: 2274

Re: Gravitational potential energy (wtf?)

I almost always think about potential energy in terms of a hill (even now as a senior physics major). Since PE=mgh, PE is proportional to h, so the hill is the same shape as PE. You have to work with a frictionless hill though.
by danpilon54
Thu Oct 23, 2008 1:38 am UTC
Forum: Science
Topic: You might be a physics major if...
Replies: 540
Views: 62641

Re: You might be a physics major if...

I now find it mystifying that people think it's okay to just come up with stuff and, like, believe it, without at least doing an order-of-magnitude calculation. You might be a physics major if you evaluate your test scores in terms of "orders of magnitude". (Doubly directed at Physics III...
by danpilon54
Wed Oct 22, 2008 3:07 pm UTC
Forum: Science
Topic: You might be a physics major if...
Replies: 540
Views: 62641

Re: You might be a physics major if...

[anal retentiveness] Of course a true physicist knows that a person not getting thrown off their feet by a shotgun blast is not in fact due to newton's laws, but rather impulse, the density of the human body, and the time it takes the bullet to be accelerated in the gun. If you had an immensely long...
by danpilon54
Wed Oct 22, 2008 3:03 pm UTC
Forum: Science
Topic: Gravitational potential energy (wtf?)
Replies: 18
Views: 2274

Re: Gravitational potential energy (wtf?)

All of this is true. The 0 point is arbitrary, but is generally taken (for potentials and fields) to be at infinite distance away. This makes gravitational potential always negative for simplicity. Of course if you're not worrying about anything bigger than a few meters, it helps to make the 0 point...
by danpilon54
Wed Oct 22, 2008 12:01 pm UTC
Forum: Science
Topic: Gravitational potential energy (wtf?)
Replies: 18
Views: 2274

Re: Gravitational potential energy (wtf?)

Gravitational potential energy is the energy you would need (kinetic energy) to escape the gravitational pull of an object. To answer your specific questions: When doing problems using potential energy, only the relative difference in potential energy between two points is important. If you are fall...
by danpilon54
Mon Oct 20, 2008 10:44 pm UTC
Forum: Food
Topic: from the makers of THE CEREAL POLL: The PB&? Poll
Replies: 38
Views: 3437

Re: from the makers of THE CEREAL POLL and other fine products

My usual is jelly, as Im sure is the case for most, but I LOVE peanutbutter and honey. I might even take it over chocolate chips.
by danpilon54
Fri Oct 17, 2008 4:57 am UTC
Forum: Science
Topic: MassCar (Gr. 11 physics)
Replies: 16
Views: 1967

Re: MassCar (Gr. 11 physics)

You are basically right so far. What limits the amount of work done in the problem?

Have you learned about torque? If yes you might want to think about wheel design.
by danpilon54
Fri Oct 17, 2008 4:52 am UTC
Forum: Science
Topic: Magnetic Field by Rotating Sphere
Replies: 5
Views: 7969

Re: Magnetic Field by Rotating Sphere

I don't have time to do it out myself, but the current density is the charge density times the velocity, not the angular velocity. That might be your problem.
by danpilon54
Fri Oct 17, 2008 4:46 am UTC
Forum: Science
Topic: Linear algebra
Replies: 14
Views: 2125

Re: Linear algebra

keep an eye out for eigenvalues and eigenvectors. Those are key.
by danpilon54
Fri Oct 17, 2008 1:53 am UTC
Forum: Science
Topic: MassCar (Gr. 11 physics)
Replies: 16
Views: 1967

Re: MassCar (Gr. 11 physics)

Here are some hints.

What force is applied to the car?
How can you relate force and work?
How can you relate work and the mass that drops?

If you can answer these questions you can answer the question.
by danpilon54
Fri Oct 17, 2008 1:51 am UTC
Forum: Science
Topic: Speed of light visual warping question
Replies: 4
Views: 1090

Re: Speed of light visual warping question

2 things 1. you can't actually hit the speed of light. You can only limit towards it as you gain more and more energy. Traveling at the speed of light means you have infinite energy. 2. You can't outrun light. Light goes the speed of light no matter how fast you go. This is the foundation of special...
by danpilon54
Wed Oct 15, 2008 12:49 pm UTC
Forum: General
Topic: High and low point of your day
Replies: 3315
Views: 246910

Re: High and low point of your day

Slompstain wrote:'just find your best friend'


Been there. Done that. Turned out she was just my best friend. Key is to find someone who could become your best friend.

on topic:
High: I slept last night
Low: Other than last night I havent slept at all for a few days.
by danpilon54
Wed Oct 15, 2008 5:51 am UTC
Forum: Science
Topic: Linear algebra
Replies: 14
Views: 2125

Re: Linear algebra

*cough* quantum mechanics *cough*. All will be clear when you take quantum (unless you have already). Basically the entire process of doing quantum mechanics involves finding eigenstates and eigenvalues for different hamiltonian operators. All of this is purely linear algebra. I think just about all...
by danpilon54
Tue Oct 14, 2008 4:45 am UTC
Forum: Food
Topic: It's Soooo Coooold...But Soooo Gooood
Replies: 14
Views: 1642

Re: It's Soooo Coooold...But Soooo Gooood

in an attempt not to repeat what others have already said, peas.

I love frozen peas way more than raw or cooked peas. Never tried frozen cooked peas tho...
by danpilon54
Mon Oct 13, 2008 4:34 pm UTC
Forum: Science
Topic: Flight on Mars
Replies: 11
Views: 2011

Re: Flight on Mars

It's kind of complicated I would think. I'd guess that with Earth's gravity and Mars' atmosphere, it would not work, but approaching Mars' gravity it gets more and more likely to work. Where is the cutoff point? I don't know. You would have to do some simulations with different plane designs to real...
by danpilon54
Mon Oct 13, 2008 12:09 am UTC
Forum: Science
Topic: Favorite phenomenon
Replies: 23
Views: 2447

Re: Favorite phenomenon

I don't know if you consider this a phenomenon, but we just learned about hyperfine splitting in quantum mechanics, and I found it amazing that by doing degenerate quantum perturbation theory you can predict you will see 21cm wavelength light coming from all over space (wherever there is hydrogen), ...
by danpilon54
Sun Oct 12, 2008 12:11 am UTC
Forum: Food
Topic: Trifle
Replies: 12
Views: 1299

Re: Trifle

Ive only had americanized trifle. It was possibly the greatest achievement man has every made. It was chocolate and vanilla pudding, cake, cherries, fudge bits, whipped cream, and caramel. O MY GOD.
by danpilon54
Sun Oct 12, 2008 12:07 am UTC
Forum: Food
Topic: How do you like your eggs?
Replies: 76
Views: 7599

Re: How do you like your eggs?

scrambled, but fried and omeletted are close seconds.

scrambled plus cheese wins over all though.
by danpilon54
Thu Oct 02, 2008 6:47 pm UTC
Forum: Science
Topic: The Most Sciencey-Sounding Word/Phrase You've Heard
Replies: 176
Views: 34398

Re: The Most Sciencey-Sounding Word/Phrase You've Heard

Micro-electrical-mechanical systems (MEMS) technology. Gotta love that mouthful.
by danpilon54
Fri Sep 26, 2008 5:18 pm UTC
Forum: General
Topic: High and low point of your day
Replies: 3315
Views: 246910

Re: High and low point of your day

Hi: Watching old boy with friends tonight and playing the presidential debate drinking game.
Low: I got sick last night and Im not feeling excellent right now.
Low: I might not be well enough to enjoy tonight very much.
by danpilon54
Tue Sep 23, 2008 8:14 pm UTC
Forum: Science
Topic: String Theory?
Replies: 35
Views: 3769

Re: String Theory?

I think we're arguing over different things. Its not that all theories have to be verifiable immediately, its that so many people accept it as fact before any verifying evidence has been shown. If it was just some other theory I wouldn't have a problem with it, but the fact that it's so publicized a...
by danpilon54
Tue Sep 23, 2008 3:11 pm UTC
Forum: Science
Topic: String Theory?
Replies: 35
Views: 3769

Re: String Theory?

But at least theories like GR make predictions that the old theory did not make that could be tested. String theory might make new predictions (I really don't know too many details about it), but currently they are untestable. I just think that something that is untestable is pointless. Its more phi...
by danpilon54
Wed Sep 17, 2008 1:24 am UTC
Forum: Science
Topic: Hawking radiation?
Replies: 2
Views: 873

Re: Hawking radiation?

Exceptions to the conservation of energy, no matter how small, would make all of physics fail. So basically its an assumption, unless Im missing something. We dont know what happens in the singularity of a black hole, so its the only consistent way to think about black holes. I am most certainly not...
by danpilon54
Wed Sep 17, 2008 1:10 am UTC
Forum: General
Topic: High and low point of your day
Replies: 3315
Views: 246910

Re: High and low point of your day

Klapaucius wrote:High point: Realizing there wasn't really a low point to my day
Low point: Realizing that was the high point of my day


*my head asplode*

High point: only 1 class today
Low point: had to write a research grant proposal...
by danpilon54
Tue Sep 16, 2008 8:48 pm UTC
Forum: Science
Topic: Space Exploration Poll
Replies: 13
Views: 1974

Re: Space Exploration Poll

I voted more on us actually doing it rather than the ability to. I am sure the first 2 will definitely be achievable in the next 100 years.
by danpilon54
Tue Sep 16, 2008 6:05 pm UTC
Forum: Science
Topic: Space Exploration Poll
Replies: 13
Views: 1974

Re: Space Exploration Poll

I voted moon base in 100-200, because I know it could be useful and it is on people's minds, but afaik nothing is currently being done in regards to it. I put never for the rest. For the Mars base, it is just inefficient. A moon base is nice because of the low gravity and closeness of the moon. A Ma...
by danpilon54
Tue Sep 16, 2008 6:00 pm UTC
Forum: Science
Topic: Wave propagation: basic physics question - how does it know
Replies: 17
Views: 2244

Re: Wave propagation: basic physics question - how does it know

the wave equation has unique solutions only when given an initial position and velocity. A snapshot gives position. Since velocity matters, you cannot tell where the wave is going or what it will do at all with just a snapshot.
by danpilon54
Mon Sep 15, 2008 12:01 am UTC
Forum: Science
Topic: String Theory?
Replies: 35
Views: 3769

Re: String Theory?

Simpler isn't always better IMO. Just because its simple and makes the same predictions does not mean it is true. Im talking mechanism here. Are there really tiny vibrating strings? Avoiding the philosophy of existence, its a yes or no question. If it is no, I dont care how beautiful it is, its math...
by danpilon54
Sat Sep 13, 2008 2:52 pm UTC
Forum: Science
Topic: Universal Symmetry
Replies: 13
Views: 1904

Re: Universal Symmetry

yea that argument assumes the big bang obeyed classical physics. Not only was it not a classical phenomenon, it wasn't even quantum mechanical (in the sense we know). We dont even have physics that can describe what was going on before some non-zero time after the big bang because so much mass was i...
by danpilon54
Sat Sep 13, 2008 2:43 pm UTC
Forum: Science
Topic: String Theory?
Replies: 35
Views: 3769

Re: String Theory?

I completely agree. I also dont get why string theory, which is purely mathematical and just about the least approachable for the average person, is the most publicized theory out there. IMO it's not physics if the theory is not motivated by observations and cannot predict future observations.
by danpilon54
Wed Sep 10, 2008 8:44 pm UTC
Forum: Science
Topic: What do you think we will see at the LHC?
Replies: 160
Views: 20327

Re: What do you think we will see at the LHC?

So - is the universe still there for you guys? It looks fine here, but I'd like some confirmation. Well yes but as I understand it they haven't "crossed beams" yet. So who knows :roll: No vacuum is perfect, so there is residual gas in the collider's pipes. Proton-nucleus collisions have o...
by danpilon54
Wed Sep 10, 2008 8:38 pm UTC
Forum: Science
Topic: Few Questions - Mainly about LHC
Replies: 43
Views: 4794

Re: Few Questions - Mainly about LHC

Is it just me or does brane collision just seem like, hey what if two extradimenional things collided? You'd get a big bang! Get it? A big bang! And they call it physics.

Show evidence of branes and especially that they existed before the big bang and Ill maybe buy into it.
by danpilon54
Wed Sep 10, 2008 8:26 pm UTC
Forum: General
Topic: High and low point of your day
Replies: 3315
Views: 246910

Re: High and low point of your day

low: spent 5 hours with comcast installation guy and now everyone in my apartment has cable except me... lower: found out that the bank check I mailed for this months rent never got to its destination, and now have to wait 90 days to get the money back while in the mean time have to pay the amount a...

Go to advanced search