Search found 54 matches

by mikau16
Fri Jan 22, 2016 7:55 pm UTC
Forum: Science
Topic: electromagnets motors and resistance question
Replies: 3
Views: 1999

electromagnets motors and resistance question

I used to experiment with electromagnets as a kid using the classic "coil a wire around a nail and attach it to a battery" experiment. What always confused me was that the wire would get ridiculously hot - sometimes enough to melt the rubber coating on the wires. But if ran a current throu...
by mikau16
Wed Apr 09, 2014 9:42 pm UTC
Forum: Science
Topic: Non-circular gear creation and uses (software now published)
Replies: 24
Views: 13931

Re: Non-circular gear creation and uses (software now publis

Hey guys! I just wanted to let you all know that I did end up publishing this software (with a ton of new features). As it turns out a lot of people seem to be interested in these gears merely for their artistic value. They seem to be good attention getters. It has a fancy new design feature that le...
by mikau16
Thu Feb 07, 2013 4:46 am UTC
Forum: Science
Topic: Non-circular gear creation and uses (software now published)
Replies: 24
Views: 13931

Re: Non-circular gear creation and uses

Hey guys! While I'm still not sure how I want to officially release this software, I have decided to give out an evaluation version. This version allows you to design and view gears graphically, but not export or save the results. Unfortunately this is Windows only. You can find an installer plus a ...
by mikau16
Sat Sep 15, 2012 4:30 pm UTC
Forum: Science
Topic: Non-circular gear creation and uses (software now published)
Replies: 24
Views: 13931

Re: Non-circular gear creation and uses

Here are a couple more, fairly ridiculous gear creations produced by my software (and loaded into a 2d Physics Simulator called 'Working Model 2D') http://www.youtube.com/watch?v=sSjmGc3xRi8 and http://www.youtube.com/watch?v=nIuRqrGTTlM&feature=plcp Sorry, the later video is choppy due to a suc...
by mikau16
Wed Sep 12, 2012 2:57 am UTC
Forum: Science
Topic: Non-circular gear creation and uses (software now published)
Replies: 24
Views: 13931

Re: Non-circular gear creation and uses

Does this allow you to make a, I dunno the right term for it, but a threshold output? Like, a gearbox that takes constant input, and produces what amounts to a sine wave or square wave output of RPM? Am I looking at that right? I'm not sure what you mean by 'constant input' but... I'm assuming by R...
by mikau16
Tue Sep 11, 2012 10:50 pm UTC
Forum: Science
Topic: Non-circular gear creation and uses (software now published)
Replies: 24
Views: 13931

Re: Non-circular gear creation and uses

Thanks for the feedback, guys! :) That was really cool! What sort of mechanical applications do you envision for these? Does the fact that they're not circular impart differential wear and tear on them? Well thinking up useful applications was part of the reason I posted this. I can't think of too m...
by mikau16
Tue Sep 11, 2012 8:07 pm UTC
Forum: Science
Topic: Non-circular gear creation and uses (software now published)
Replies: 24
Views: 13931

Non-circular gear creation and uses (software now published)

Edit. This software has been completed and published. You can get a demo at http://www.gearifysoftware.com see my latest reply for more details. Hey guys! So, midway through obtaining my math degree in college, my father was working on an engineering problem involving elliptical shaped gears. For h...
by mikau16
Wed May 18, 2011 5:15 pm UTC
Forum: Serious Business
Topic: Incorruptible Saints prove God exists - help debunking?
Replies: 28
Views: 7254

Re: Incorruptible Saints prove God exists - help debunking?

Right, and there's something to be said for the fact that many of these so called incorruptibles are corrupting very slowly. Not sure why God's grace would be an imperfect preservative! :P Meanwhile, I did just come accross this article http://skeptoid.com/episodes/4126 The best examples of natural ...
by mikau16
Wed May 18, 2011 9:25 am UTC
Forum: Serious Business
Topic: Incorruptible Saints prove God exists - help debunking?
Replies: 28
Views: 7254

Re: Incorruptible Saints prove God exists - help debunking?

Thanks for the quick response, julesIt! I hadn't heard about this "Adipocere" stuff, but I did read about the physical causes which can naturally slow decomposition, but it seems weird considering many of them had no special embalming treatment, and are kept on display in conditions which,...
by mikau16
Wed May 18, 2011 8:58 am UTC
Forum: Serious Business
Topic: Incorruptible Saints prove God exists - help debunking?
Replies: 28
Views: 7254

Incorruptible Saints prove God exists - help debunking?

I'm a self proclaimed athiest, but was raised in a (very) religious, roman catholic family. And one thing my parents, and siblings always point to, when arguing with me over the existance of God are the so called "incorruptible" saints, who's bodies do not decompose, and are said to be spa...
by mikau16
Tue Jul 14, 2009 6:38 am UTC
Forum: Science
Topic: looking for a good Physics simulation program
Replies: 5
Views: 1479

looking for a good Physics simulation program

my father is not an engineer or a scientist but he likes to build various devices or contraptions that he hopes he will be able to market some day. His designs are often quite nice, but building prototypes to test them is usually where the trouble starts for him. Many of his designs are difficult an...
by mikau16
Thu Apr 16, 2009 5:24 am UTC
Forum: Science
Topic: inductors, alternating current, transformers
Replies: 3
Views: 852

Re: inductors, alternating current, transformers

thank you for your helpful response!

so what about the second question,
(current in primary)x(voltage in primary) = (current in secondary)x(voltage in secondary)
by mikau16
Thu Apr 16, 2009 4:13 am UTC
Forum: Science
Topic: inductors, alternating current, transformers
Replies: 3
Views: 852

inductors, alternating current, transformers

okay, so we make a transformer by wrapping a (primary) coil of wire N1 times around an iron core (shaped like a square hoop), and the core loops around and passes through a (secondary) coil of N2 turns. so suppose we connect the secondary coil in series with a switch (so we can open and close the ci...
by mikau16
Sun Apr 05, 2009 5:44 pm UTC
Forum: Science
Topic: inductors and magnetic flux
Replies: 8
Views: 2005

Re: inductors and magnetic flux

don't you mean 5 ideal cents? and sure, pnyxt, but that is a computer simulation so i assume it treats all the components as ideal. What I'm wondering is why the current is moving faster through one inductor than another as if there was some resistance. But i think i get it now... the current throug...
by mikau16
Sun Apr 05, 2009 12:05 am UTC
Forum: Science
Topic: inductors and magnetic flux
Replies: 8
Views: 2005

Re: inductors and magnetic flux

thank you again, Avian, for the quick and helpful response! :] I agree the idea of equivalent flux made me uncomfortable, using the relationship: V induced = -Ldi/dt i was able to derive that relationship and solve the problem. :) I guess my only remaining question is, does an inductor necessarily h...
by mikau16
Sat Apr 04, 2009 10:22 pm UTC
Forum: Science
Topic: inductors and magnetic flux
Replies: 8
Views: 2005

Re: inductors and magnetic flux

thank you! I understand it now.. I guess i just misunderstood the question. But unfortunately i have a new problem! So my book asks me to show that the equivalent inductance between two inductors connected in parallel is given by: 1/L eq = 1/L 1 + 1/L 2 I am confounded.. we have the relationship: L=...
by mikau16
Thu Apr 02, 2009 10:19 pm UTC
Forum: Science
Topic: inductors and magnetic flux
Replies: 8
Views: 2005

inductors and magnetic flux

Okay, so my physics book tells me: An inductor can be used to produce a desired magnetic field. We shall consider a long solonoid as our basic type of inductor. If we establish a current i in the N windings (turns) of the solenoid we are taking as our inductor, the current produces a magnetic flux f...
by mikau16
Thu Feb 19, 2009 9:36 pm UTC
Forum: Science
Topic: batteries, electric potential and current
Replies: 9
Views: 1123

Re: batteries, electric potential and current

Ahhh! Now I see! The flaw in my reasoning was I assumed the electric field inside the battery was the same as that in the wire outside the battery. You'd think it would be the case, since charge is flowing through it.. hinky! But reversing the direction of the electric field inside the battery fixes...
by mikau16
Thu Feb 19, 2009 8:19 pm UTC
Forum: Science
Topic: batteries, electric potential and current
Replies: 9
Views: 1123

Re: batteries, electric potential and current

*spits up breakfast* hold on a second! does the electric field inside a battery look something like this? let | | be the battery and >> denote the direction of the electric field: >> | >> | >> (my original assumption) or this: << | >> | << (my new suspicion)
by mikau16
Thu Feb 19, 2009 7:49 pm UTC
Forum: Science
Topic: batteries, electric potential and current
Replies: 9
Views: 1123

Re: batteries, electric potential and current

unless i am horrribly sleep deprived, what you just said implies electrons flow from positive to negative.
by mikau16
Thu Feb 19, 2009 7:17 pm UTC
Forum: Science
Topic: batteries, electric potential and current
Replies: 9
Views: 1123

Re: batteries, electric potential and current

My thanks to both of you for the quick and helpful response. I understood you both completely. but something's screwy.. my book claims that when you connect a capacitor consisting of two parallel plates, to either ends of a battery, with plate H connected to the positive terminal, and plate L connec...
by mikau16
Thu Feb 19, 2009 5:59 pm UTC
Forum: Science
Topic: batteries, electric potential and current
Replies: 9
Views: 1123

batteries, electric potential and current

So I understand that the purpose of a battery is to set up an electric potential difference between its terminals, and the end with higher potential is marked + and lower potential is marked -, thus the electric potential energy increases as a positive test charge is moved from - to +, and thus nega...
by mikau16
Sat Feb 14, 2009 10:10 pm UTC
Forum: Mathematics
Topic: best excuse for being fat!
Replies: 17
Views: 2781

Re: best excuse for being fat!

*gazes with satisfaction upon what he has started*
by mikau16
Fri Feb 13, 2009 2:47 am UTC
Forum: Mathematics
Topic: best excuse for being fat!
Replies: 17
Views: 2781

Re: best excuse for being fat!

you may be right! :]
by mikau16
Fri Feb 13, 2009 2:37 am UTC
Forum: Mathematics
Topic: best excuse for being fat!
Replies: 17
Views: 2781

best excuse for being fat!

point to a slim guy and state that the two of you are topologically equivalent! one can be obtained from the other by stretching or shrinking, and you both contain the same number of holes!
by mikau16
Wed Jan 14, 2009 4:15 am UTC
Forum: Mathematics
Topic: Project Euler Problem 44 (my solution)
Replies: 0
Views: 3194

Project Euler Problem 44 (my solution)

Okay, i got stuck on this problem for weeks, it was somewhat akin to that 'infinite grid of nodes' problem Randall was obsessed with. After solving it,I scoured the solution thread, and other internet sites to find what others had done, and was disgusted to find dozens and dozens of incorrect algori...
by mikau16
Fri Aug 15, 2008 7:43 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0463: "Voting Machines"
Replies: 108
Views: 33057

Re: "Voting Machines" discussion

This was a pretty good comic. I kind of disliked the use of "you're doing it wrong". It sounded kind of awkward and forced, and made the protagonist seem like someone who talks in internet memes. Someone I don't really care about. you mean T-rex? http://www.qwantz.com/archive/001127.html ...
by mikau16
Mon May 05, 2008 5:30 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0419: "Forks and Spoons"
Replies: 146
Views: 30716

Re: "Forks and Spoons" Discussion

"you're toying with powerful forces here"

honestly, this really sounds like something Ian Malcolm (Jeff Goldblum) would say in Jurassic Park, but I can't seem to find it anywhere.
by mikau16
Sat Apr 19, 2008 5:17 am UTC
Forum: Science
Topic: work done by a pump
Replies: 11
Views: 3691

Re: work done by a pump

you're right! That does give 66.

now i want to know.. why does that give us the power?
by mikau16
Sat Apr 19, 2008 5:07 am UTC
Forum: Science
Topic: work done by a pump
Replies: 11
Views: 3691

Re: work done by a pump

Hey! I think I got the idea, though i still haven't found the right answer. One of the ways work is defined is as the change in kinetic energy. In each second, the pump is taking stationary water in the basement below, and setting it in motion, thus producing a change in kinetic energy. Thus the kin...
by mikau16
Sat Apr 19, 2008 4:51 am UTC
Forum: Science
Topic: work done by a pump
Replies: 11
Views: 3691

Re: work done by a pump

well my computations give 1.54 kg of water per second. The weight is therefore 1.55g, and this is being lifted 4.9 meters in each second. All together this results in 4.9*1.55*9.8 which is about 73.95, which also misses the mark.
by mikau16
Sat Apr 19, 2008 3:52 am UTC
Forum: Science
Topic: work done by a pump
Replies: 11
Views: 3691

Re: work done by a pump

I doubt it. If it did, we would probably be given more information.

Actually the book has not discussed viscosity and friction in fluids at this point, so the answer is definitely no.
by mikau16
Sat Apr 19, 2008 3:39 am UTC
Forum: Science
Topic: work done by a pump
Replies: 11
Views: 3691

work done by a pump

can't figure this one out. Water is pumped steadily out of a flooded basement at a speed of 4.9 m/s through a uniform hose of radius 1.0 cm. The hose passes out through a window to a street ditch 3.2 m above the waterline. What is the power of the pump? Okay, this was given as a problem in the secti...
by mikau16
Fri Apr 18, 2008 5:33 am UTC
Forum: Science
Topic: tricky physics problem involving pressure
Replies: 5
Views: 5089

Re: tricky physics problem involving pressure

Okay, I THINK i can guess what we're supposed to do. If you consider the cross sectional area of the sphere, and use the relationship Pressure = Force/Area, we should get the force on the entire sphere. BUT! who says we can just take the cross sectional area and ignore the shape? My book specificall...
by mikau16
Fri Apr 18, 2008 5:04 am UTC
Forum: Science
Topic: tricky physics problem involving pressure
Replies: 5
Views: 5089

tricky physics problem involving pressure

so we just started talking about fluids in my physics course. The first section of the chapter just defines pressure and density, and the pressure of the atmosphere. They then give a homework problem on this section which baffles me: In 1654 Otto Von Guericke, inventor of the air pump, gave a demons...
by mikau16
Thu Apr 10, 2008 10:28 pm UTC
Forum: Science
Topic: Impossible physics problem- SOLVED
Replies: 36
Views: 6258

Re: Impossible physics problem- SOLVED

yeah, I wouldn't have asked for help had I realized thats what they wanted.

Still it produced an interesting discussion, and I'm liking that plotter Strilanc made.
by mikau16
Thu Apr 10, 2008 10:04 pm UTC
Forum: Science
Topic: Impossible physics problem- SOLVED
Replies: 36
Views: 6258

Re: Impossible physics problem

I am terribly sorry, guys. I made a horrible mistake. :oops: I must have read the problem too fast and did not pay close enough attention. Here is the actual problem: Three point particles are fixed in place in an xyz coordinate system. Particle A, at the origin, has mass mA. Particle B, at xyz coor...
by mikau16
Thu Apr 10, 2008 6:17 am UTC
Forum: Science
Topic: Impossible physics problem- SOLVED
Replies: 36
Views: 6258

Re: Impossible physics problem

sweet program!

but yeah, you'll need to try it with unequal masses. In this particular problem, the masses happen to be 3m, 2m, and 1m, with m given.
by mikau16
Thu Apr 10, 2008 5:26 am UTC
Forum: Science
Topic: Impossible physics problem- SOLVED
Replies: 36
Views: 6258

Re: Impossible physics problem

Not to be bitchy, Feynman, but would you mind posting that elsewhere? Its just that kind of thing can distract people who might be able to solve this and lead the discussion away from figuring out this problem, which is the sole purpose of this thread (at least until its solved). I hope I don't soun...
by mikau16
Thu Apr 10, 2008 4:30 am UTC
Forum: Science
Topic: Impossible physics problem- SOLVED
Replies: 36
Views: 6258

Re: Impossible physics problem

Yeah, I understand that. Maybe General Relativity can swoop in with an elegant solution?


NOOOOOOOOOOO!!! :|

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