Search found 353 matches

Fri Aug 19, 2011 9:32 am UTC
Forum: School
Replies: 16
Views: 4000

If you want to be an engineer, come to Waterloo. The co-op opportunities are unbeatable.

If you want to be a Doctor and take science, go to Toronto or Mcgill. However, as a heads up it's not easy to get into med school. And honestly a bachelors in science won't net you much.
Sat Jul 30, 2011 7:56 am UTC
Forum: Science
Topic: Teller-Ulam fusion generator
Replies: 25
Views: 3468

Re: Teller-Ulam fusion generator

>> (like, nothing interresting happens under nuclear weapon-level energies, which would blow the power plant) That should be the main problem. There is a good reason why all fusion bombs are quite large - you need a lot of energy to compress the material, and that is just impossible with some small...
Tue Jul 12, 2011 8:56 am UTC
Forum: Science
Topic: Schrodinger's Cat was just to illustrate a point, right?
Replies: 153
Views: 19327

Re: Schrodinger's Cat was just to illustrate a point, right?

An interesting question. Suppose we have 2 systems. Each system is wavelike in nature. Now we make the two systems interact. Does this interaction cause the wavefunctions to collapse and for distinct interactions to happen between the two systems? Or does the interaction cause the two systems to bec...
Sun Jul 03, 2011 5:46 pm UTC
Forum: Mathematics
Topic: Example of a non-surjective function
Replies: 7
Views: 8239

Re: Example of a non-surjective function

Also from wikipedia: The function g : R → R defined by g(x) = x^2 is not surjective, because there is no real number x such that x^2 = −1. However, the function g : R → R+ defined by g(x) = x^2 (with restricted codomain) is surjective because for every y in the positive real codomain Y there is at l...
Mon Jun 20, 2011 10:45 pm UTC
Forum: School
Topic: College Application Essay
Replies: 7
Views: 3409

Re: College Application Essay

Write about what you really care about. You'll write much better that way. If you can't think of something you really care about, you may wish to reevaluate why you are going to college (at least in that field).
Mon Jun 20, 2011 10:43 pm UTC
Forum: School
Topic: Working for a department head as a Ph.D. student?
Replies: 5
Views: 2381

Re: Working for a department head as a Ph.D. student?

This is the general consensus. It can really depend on what you want to do and how you work. If you need more guidance, then don't work for a department head because obviously they will have less time to spend with you (unless your group size is really small). I had the option of working with a grou...
Thu Jun 16, 2011 3:51 am UTC
Forum: School
Topic: Problem-solving techniques for core engineering courses
Replies: 5
Views: 2325

Re: Problem-solving techniques for core engineering courses

Does anyone have any to share? I'm on the schedule to retake Mechanics of Materials next semester, and I'm not too thrilled about it. The issue last semester wasn't with the material in the course -- very little of it even demanded a second read-through -- but in working the problems themselves. I ...
Wed Jun 15, 2011 8:17 pm UTC
Forum: Science
Topic: Entropy?
Replies: 16
Views: 4886

Re: Entropy?

Entropy is basically how organized something is. Lets say I have the following numbers: 1, 2, 3, 4, 5 I can arrange them 12345 which is an ordered arrangement. Imagine that this is "useful" to me. Now imagine that I arrange them 54213 or 32541 or 14325. These are "random" arrange...
Wed Jun 15, 2011 6:42 pm UTC
Forum: Science
Topic: Variation of Cathodic rust prevention
Replies: 18
Views: 2709

Re: Variation of Cathodic rust prevention

I would have to agree that using a dessicator would be your best bet. You could also simply coat the surface in an oil (you should be able to find this at a general or hardware store), but if you are going to be using a metal mesh and have to clean the oil off every time it will become very time con...
Tue Jun 14, 2011 6:44 am UTC
Forum: Science
Topic: Variation of Cathodic rust prevention
Replies: 18
Views: 2709

Re: Variation of Cathodic rust prevention

Can you elaborate abit more on exactly what you hope is going to happen?
Tue Jun 14, 2011 6:42 am UTC
Forum: Science
Topic: MCAT Solubility Question
Replies: 3
Views: 2305

Re: MCAT Solubility Question

You are just overthinking the question. The concentration of NiSO4 is important because what if both MgF2 and NiSO4 percipitate out? In order to see if that happens you would have to know the concentration of the original salts. The answer they gave did not consider higher order interactions, which ...
Tue Jun 14, 2011 6:34 am UTC
Forum: Science
Topic: Wait, can free will exist?
Replies: 247
Views: 27706

Re: Wait, can free will exist?

I think, therefore I am. I do not know that my experiences are actually real, that my memories are real or that anyone else exists with certainty. Infact, given that my body changes from moment to moment at an atomic and molecular level, I am never the same person as I was a moment ago. Yet I observ...
Sat Jun 11, 2011 5:57 am UTC
Forum: Science
Topic: joining theoretical physics research group?
Replies: 10
Views: 2167

Re: joining theoretical physics research group?

Based on the fact that you have none of these courses or experience... can I ask you why you actually want to do theoretical physics? Do you know what kind of work is involved?
Fri Jun 10, 2011 7:13 am UTC
Forum: General
Topic: Actual Engineers - What is it really like?
Replies: 20
Views: 5430

Re: Actual Engineers - What is it really like?

It depends where you work. I've worked for alot of companies doing co-op and some places were great and some places were boring. As an excellent contrast example I've had friends who have worked for both Ford and Toyota. They said that working at Ford was basically working in a place where nobody ga...
Fri Jun 10, 2011 7:09 am UTC
Forum: Science
Topic: Getting publications or improving GREs?
Replies: 8
Views: 1705

Re: Getting publications or improving GREs?

Research is much, much more important than GRE scores. That being said, a 400 is pretty low for a too 10 physics school. A fellowship shouldn't care. I'm aware the research counts for more. But in my case, its not about getting a very high verbal GRE score. Its just a matter of trying to get above ...
Fri Jun 10, 2011 3:32 am UTC
Forum: Science
Topic: Metals don't reflect UV?
Replies: 24
Views: 8413

Re: Metals don't reflect UV?

The plasmon energy depends on the electron density in the conduction band Okay, I didn't know that. Theorically, it's not that difficult to change the elctron density, and it's done commonly with semiconductors, although the initial density is much lower. It might still be doable with thin sheets o...
Fri May 27, 2011 8:26 pm UTC
Forum: Science
Topic: No such thing as velocity?
Replies: 6
Views: 1634

Re: No such thing as velocity?

phase velocity (momentum) and group velocity (complicated) Are you sure it's not the opposite? In electromagnetism, (so with huge wavelength photons), we can get phase velocity higher than c, or negative. I always thought of the group velocity as the speed at which energy and information travel, so...
Thu May 26, 2011 1:05 am UTC
Forum: Science
Topic: Getting publications or improving GREs?
Replies: 8
Views: 1705

Re: Getting publications or improving GREs?

The verbal section, if I recall correctly is pretty tough. I think the Harvard average is somewhere in the low to mid 500's (tried to look it up but couldn't find it easily). I didn't think grad schools even cared about the normal GRE, they only cared about the subject ones. They don't really care ...
Tue May 24, 2011 5:18 am UTC
Forum: Science
Topic: colour of the sky
Replies: 28
Views: 9851

Re: colour of the sky

That's not right at all. When you say an object is blue, you are saying that the object will absorb all light except blue light, which is reflected. This is the opposite of what happens in the atmosphere. Specifically because the atmosphere is relatively transparent to non blue light does the atmos...
Mon May 23, 2011 2:32 am UTC
Forum: Science
Topic: colour of the sky
Replies: 28
Views: 9851

Re: colour of the sky

The sky is blue because air is very faintly blue. Understanding that Rayleigh scattering explains why collections of particles scatter blue light is nice- but the short explanation is simply that air is blue. That's not right at all. When you say an object is blue, you are saying that the object wi...
Mon May 23, 2011 2:27 am UTC
Forum: Science
Topic: Getting publications or improving GREs?
Replies: 8
Views: 1705

Re: Getting publications or improving GREs?

Research is much, much more important than GRE scores.

That being said, a 400 is pretty low for a too 10 physics school. A fellowship shouldn't care.
Sun May 01, 2011 4:19 pm UTC
Forum: Science
Topic: A solar cell experiment with unfathomable results
Replies: 19
Views: 3946

Re: A solar cell experiment with unfathomable results

Assuming the two ends of your cell have a resistor or something between them, then a lower current (less photocarriers from dye absorption) provides higher operational voltage due to lower resistive drops. If your cell is operating in hot injection mode initially, then it may have a high operational...
Sat Apr 23, 2011 3:12 am UTC
Forum: Science
Topic: Is this even possible? my polymer did the impossible???
Replies: 36
Views: 6512

Re: Is this even possible? my polymer did the impossible???

The rate of temperature decrease itself is due to an increase in the heat capacity of the sample. It just takes more and more heat energy to increase the temperature. Only if the temperature actually drops can it be an endothermic reaction. the rate of temperature decrease is important, because the...
Fri Apr 22, 2011 5:22 am UTC
Forum: Science
Topic: Magnetic graphite
Replies: 6
Views: 5056

Re: Magnetic graphite

But what about the attraction? I could pick up the lead from about half a centimeter away and have it stick there. Like... half the centimeter above the pencil lead? Ie the lead was being pulled upwards? How large was the lead? Are you sure that it was pencil lead, and not bits of the magnet that h...
Thu Apr 21, 2011 10:25 pm UTC
Forum: Science
Topic: Is this even possible? my polymer did the impossible???
Replies: 36
Views: 6512

Re: Is this even possible? my polymer did the impossible???

Ok well honestly there is no way it is actually dropping in temperature Thats what I was thinking, but there are a few issues.... check out the graph below. Its the temperature profile from the DMA, now this machine has an active feedback system between the heating elements and the thermocouple. th...
Thu Apr 21, 2011 10:23 pm UTC
Forum: Science
Topic: Is this even possible? my polymer did the impossible???
Replies: 36
Views: 6512

Re: Is this even possible? my polymer did the impossible???

Ok well honestly there is no way it is actually dropping in temperature Thats what I was thinking, but there are a few issues.... check out the graph below. Its the temperature profile from the DMA, now this machine has an active feedback system between the heating elements and the thermocouple. th...
Thu Apr 21, 2011 6:27 am UTC
Forum: Science
Topic: Is this even possible? my polymer did the impossible???
Replies: 36
Views: 6512

Re: Is this even possible? my polymer did the impossible???

Ok well honestly there is no way it is actually dropping in temperature. Your sample prep method indicates it is unlikely there is some kind of endothermic reaction occuring, since its just gelitan. The issue might be with the temperature measurement from the thermocouple in the TMA. If the thermoco...
Sun Apr 17, 2011 9:31 pm UTC
Forum: Science
Topic: Is this even possible? my polymer did the impossible???
Replies: 36
Views: 6512

Re: Is this even possible? my polymer did the impossible???

There is also no way passing through the Tg could account for an 18 degree drop in sample temperature. The heat capacity (and coefficients of thermal expansion, for that matter) of a substance can change drastically and suddenly on passing through T g , in differential calorimetry for example, the ...
Thu Apr 07, 2011 3:54 pm UTC
Forum: School
Topic: Humanities in STEM Majors
Replies: 40
Views: 5303

Re: Humanities in STEM Majors

I don't mind taking humanities courses at all. It gives you a broader view on life and is important for a better understanding of not just how to create technology, but how to use it as well and what the impacts are. You can be a great technical person but you're not really going to become a great e...
Thu Mar 31, 2011 5:59 pm UTC
Forum: Science
Topic: Ice cooling water
Replies: 14
Views: 2277

Re: Ice cooling water

But how would you figure this out? Empirically. Thor are so many variables and different things going on that the easiest way to do it is really juſt to do it. Have a thermometer and a stopwatch handy. Actually this would be very difficult since different parts of the water would have a different t...
Wed Mar 30, 2011 9:01 pm UTC
Forum: Science
Topic: Lasers, and focusing optics
Replies: 14
Views: 1904

Re: Lasers, and focusing optics

You can indeed focus a laser beam with a lens. I am not sure about the detector problem - typically you will have a problem with so much ambient light noise, it may saturate your detector (even if you can block out other frequencies all wavelengths are present atmospherically). This may be the bigge...
Wed Mar 30, 2011 8:54 pm UTC
Forum: Science
Topic: Glass fragments reassembling themselves by chance
Replies: 17
Views: 2559

Re: Glass fragments reassembling themselves by chance

Comparable. I would even go so far as to say that event 3 is more likely, given that a whole glass is at a more energetically favorable state than a shattered glass (less surface energy).
Fri Mar 18, 2011 4:03 pm UTC
Forum: Fictional Science
Topic: Favourite faster than light technology
Replies: 92
Views: 21122

Re: Favourite faster than light technology

First you shrink the distance between you and your destination. The expansion and contraction of space is not limited to the speed of light, only movement through space is. So you find a way to locally shrink space between you and your destination, move to it and rexpand the space. Anything that get...
Fri Mar 18, 2011 3:53 pm UTC
Forum: Science
Topic: Anyone know where I can buy a solenoid?
Replies: 6
Views: 1587

Re: Anyone know where I can buy a solenoid?

Just as an update, incase anyone was wondering, I wrapped one to my own specifications. 30 gauge copper magnet wire, wrapped around a vial about 6 cm long, 2 cm in diameter, using double sided tape to hold it down. Took me about 7 or 8 hours to wrap the entire thing, which came out at 12 layers of w...
Thu Mar 17, 2011 5:41 am UTC
Forum: Science
Topic: How come axioms (assumptions) aren't used in science?
Replies: 30
Views: 3486

Re: How come axioms (assumptions) aren't used in science?

One of the fundamental assumptions of science is that science works, ie experiments are invariant in their results. Even if you could disprove translational equivilence (laws of physics do not depend on your location in space or time, which is a testable theorm that is possible to disprove) you woul...
Mon Mar 14, 2011 2:13 am UTC
Forum: Science
Topic: The problem with curing cancer.
Replies: 112
Views: 33686

Re: The problem with curing cancer.

Here's the thing though; who can come up with a bona fide cure for cancer? You? Me? Your doctor? A highly decorated professor of some sort? Perhaps; but it's incredibly unlikely. Most likely, if cancer can be cured, the cure will be discovered by a medical megaconglomerate, like GlaxoSmithKline or ...
Fri Mar 11, 2011 1:51 pm UTC
Forum: Science
Topic: Anyone know where I can buy a solenoid?
Replies: 6
Views: 1587

Re: Anyone know where I can buy a solenoid?

An air core solenoid is just insulated wire wrapped around a plastic tube. You can buy reels of thin electrical wire coated with some very thin, high breakdown voltage insulator at electrical parts suppliers. There are also many small businesses than make custom solenoids and transformers if you do...
Thu Mar 10, 2011 8:01 pm UTC
Forum: Science
Topic: Anyone know where I can buy a solenoid?
Replies: 6
Views: 1587

Anyone know where I can buy a solenoid?

So I'm working on a project right now and I need an air core solenoid. Basically I'm going to be sticking a sample in it with magnetic nanoparticles and trying to measure the heating of the particles. To do this I have to run an AC current through the solenoid. Right now I'm stuck using a ftp://ftp....
Sat Feb 26, 2011 6:04 pm UTC
Forum: Science
Topic: Depressing Physics test
Replies: 21
Views: 3354

Re: Depressing Physics test

Yambert wrote: how am I going to be cut out for graduate level classes/research?

To be honest if you want to go to grad school your interest is more important.
Tue Feb 15, 2011 6:58 pm UTC
Forum: School
Topic: TI-89 for Physics Major?
Replies: 14
Views: 2893

Re: TI-89 for Physics Major?

After 5 years in engineering I only use my graphing calculator for 2 things: 1) having a much bigger, wider and brighter screen than my standard calculator (more ergonomic) 2) being able to graph intercepts, every few months. That's it. If you sold me a calculator with the big screen, big buttons an...