Idea Definition and 803 Threads

Hiho, long time since I've posted here. So I've been thinking about 1 or 2 things. Globular clusters are assumed to be the earliest structures formed in the universe because they are roughly the size of the Jeans length. But I'm thinking that if the universe was very nearly isotropic the...

A 'friend' of mine has proposed an idea on how to achieve energy, to me it kinda sounds like perpetual motion but not too sure. Anyways here it goes; Instead of damming up a river to create a resevoir we would use a recirculating system of water. There would be a resevoir of water but it...

Problem: (y-yx^2)\frac{dy}{dx} = (y+1)^2 So, the first thing I tried was just dividing the whole equation by (y-yx^2) and then factored out the y to get \frac{dy}{dx} = \frac{(y+1)^2}{y(1-x^2)}. Next I expanded the numerator on the right side of the equation and then split them all into...

i'll have to remember this trick if i ever fart on an airplane: http://www.cbc.ca/world/story/2006/12/06/airline-fart.html

Preface:The best way I've been taught how to prove that a force is conservative is to take the curl of the force and show that it is equal to zero. That's pretty quick, but after studying for a complex analysis midterm this idea struck my mind. I'm not a master of complex analysis, so there...

I'm asking you guys for serious help in these homework for Engineering physics. 1) Protons having a kinetic energy of 5.00 Me are moving in the positive x direction and enter a magnetic field B = 0.050k (T) directed out of the plane of the page and extending from x=0 to x=1.0 m . Calculate...

Can someone point me in the right direction for this problem. I have no idea how to start on this. I know the linearization formula but i don't know if that's what i have to use here. can someone please help problem: You want a linearization that will replace the function over an interval...

Galileos idea of a fixed value for the gravitational acceleration on the Earth iss now accepted for most pratical calulations allthough variations in the Earth's crust mean that this value is not precisely uniform. However there is another phenomenon that will affected the decent of the cannon...

Would it be possible to tune commercial jet engines to emit ozone and replenish the ozone layer?

Hello, I am not an student, engineer or businessman, just a digital video hobbyist/wannabe filmmaker with an idea for a digital video product, that in my uneducated opinion, would be easy to engineer. I am looking for a person (student or otherwise) with decent knowledge of the U.S. version...

edible paper. sounds cool?

This may not be a new idea, I haven't read it anywhere else. Imagine the big bang scenario. Imagine an expanding sphere, like a bubble. Imagine that the "skin" of the sphere is thick, say thirty billion lightyears and as the sphere expands, the "skin" gets thinner. Imagine a coordinate system...

I would like to start my own electronics engineering company in the future but have no idea what it will make :smile: . If you were to start your own electronics engineering company, what would your company be about?

((If this has already been thought or won't work of please tell me so I won't pursue the idea any longer))Is it really dark matter that is causing our universe to accelerate and not slow down? What if it was that our universe was being pulled towards another universe/universes to a colision...

http://www.physorg.com/news77190620.html

A vessel has the height of 20 meters. Calculate the pressure at the bottom of the tank if it is only 50% full. take the density of water is 1000 kg per meters cubed and gravity as 10m/s squared. neglect atmospheric pressure as this will be negligable in comparison. can anybody work this...

I am taking a control class right now, which I find quite interesting. I had an idea for a senior project where I'd design and build a machine that allows one to hook up a motor and it will compute the torque/voltage transfer function or the angular speed/voltage transfer function of an...

Hello..compared to most people of this forum I'm just a "newbie"...:redface: but once i read (or i think) that to deal with perturbation theory it would be a good idea if the divergences of the type: I(m)= \int_{0}^{\infty}dpp^{n} n>1,n=0 or n<0 could be expressed in a "recursive" form for...

I've been doing a lot of thinking lately in the regards to the nature of consciousness, sentience, thought, all that great stuff that is beining investigated by neuroscience. Now my current understanding of physics may be lacking, so forgive me if some of these ideas are not accurate in...

Spinfoam idea for energy source (Louis Crane--FQXi) FQXi recently announced the award of research grants to investigate especially interesting ideas bearing on profound questions. for instance Garrett got one (a model putting matter and spacetime together in a different way that might work)...

http://alt-e.blogspot.com/2004/11/solar-chimney-for-california.html Anybody have some idea of the calculations that go into designing something like this? I'm kinda wondering how big it would need to be to get 2KW a day out of it.

Anybody body know how to do this problem or have an idea what the problem is about. See attached for diagram and question. I would like to understand and possible solve the problem if anyone can help. https://www.physicsforums.com/attachment.php?attachmentid=7406&stc=1&d=1154053940...

Hello, i have another question, sorry i didn't post them together. But I'm stuck again ... and this time i have no idea how to solve... Question: Jane wishes to quicky scale a slender vine to vist Tarzan in his treetop hut. The wine is known to safely support the combined wieght of Tarzan...

Not so sure on hwere to post this but here it is, Im sitting here doing math homework and thinking abuot how much i hate having to bust out graph paper when i want to make a graph, i also hate normal college rule paper because of the line so i normally just use an spiral art pad for math...

hello anyone i am new here and i will admit to no credentials of any kind on any physics subject now i don't know if it was Newton or einstein but whoeveres law it is that states that for every action there is an equal and opposite reaction seems? to have something very wrong with it.to me it...

Any ideas how to use tuning forks in a science fair *high school science fair*

This past semester I've been working in a group of 4 to look at a certain ketone found in hazelnuts, and it is by far the most frustrating experience I've ever had; every single problem is because people are expected to work together. The project was 8 weeks of lab, 4 hours per week. First...

would this work? first of all, i need to know if my reasons for glass being transparent are correct. glass is a crystal, therefore, when the outermost atoms are hit by lthe first photons, the energy, by way of phonons is transferred to the inner atoms as well. when the second photons come...

Under what general formal mathematical conditions does an analogous idea of energy exist and satisfy conservation? In a gradient vector field, energy as force times distance exists and is conserved in some sense. What is a more general idea? What, conceptually, makes energy "energy"? Is...

My school having a physics project competion and I don't know what to do ,can anyone give me some idea or tell me where can i find the physics project tutorial at the internet . I am a pre-U students(similar to A-level) ,I want to do a more interesting project .please elp me .

is the idea that collapse cannot be defined as something that occurs, generally known and accepted? thx

so i was in the Dining Commons today, and they had some corn bread squares at the dessert station. at first glance, they looked a bit like rice crispies treats, and i got all excited. upon further inspection, i realized what they really were and became thoroughly dissapointed. then i looked...

My god, is it just me or has every single episode of this guys show lately been about child predators?!? Kinda scary to think there's so many perverts out there... or well, am i allowed to call them perverts? Not "misunderstood"?

So I was enjoying breakfast this morning, very early like (at seven or so), and I was looking at my coffee mug, and also at a glass of grapefruit juice. So I thought, why not? and toppled the contents of one into the other. And the result was suprisingly sweet-tasting, lemony, coffee-ish, in a...

I was thinking about perpetual motion and perpetual energy generation when I got to thinking about magnets. Now, for the record, I don't think this would really work, but I can't think of why not, so maybe you guys can educate me on this. Open the attached image to look at while you read...

What's going on here? It doesn't seem like it would work well at all. I remember popular science said something about how little power it produced. Reminds me of a Carnot engine. http://en.wikipedia.org/wiki/Carnot_cycle Is this a good idea, or should I stick with nuclear fusion reactors?

Hey, would it be possible to attach hydrofoils onto a kayak---to have the padder row about a foot or more above the water level? Or have the entire kayak elevated above the water level? Then again, would the weight of the kayak and the paddler be too difficult to offset? (Though, I currently...

Can someone please explain the idea of emergence when compared to the reductionist point of view? What is the value of this idea?

i have a flat box in which i put a spinning beam hold by the center i putweights on the beam that can run longitudinally on the beam so when the beam spins the centrifugal force send them away from the center i tight a cable to a corner of the box and the weights in such a way that when...

Hi all So-called "free trade" is one of the holy grails of capitalism, is it not? And the USA takes the lead in creating and defending free markets? How, then, does one explain this? Just one example of 'capitalist freedom':rolleyes: This is just the tip of the iceberg, of course - if...

Hello! What is the real idea behind -kx? is X really the displacement of "relaxed" state and "compressed" state? or is something else!?

So I got my calc 2 final this week, and I'm doing it in leau of doing a calculus project. In case I fail the test too hard, I'd like to see if I can get a project done before the semester ends. The project involves going out and finding a business that could use calculus to make something...

For my Anatomy class, we are requiered to do a science fair project. I am having trouble coming up with an idea but I think I want to do something involving acid-base reactions. I would appreciate any ideas on this topic. Thanks.

I'll be starting grad school next year, and I'm already starting to worry about the qualifier ;) While poking around on Barnes & Noble's site I noticed that there are whole books which are just collections of problems in physics, with and without solutions. I thought that these might be a...

Hey guys. I have a lens problem: A lens has a power of 300 dipoters, and a radius a of 2 mm. An object is located just beyond the focal length to get high magnification. The space between the object is filled oil with an index of refraction 1.4. Estimate the resolution for 500 nm light...

A stuntman whose mass is 70 kg swings from the end of a 4.0-m-long rope along the arc of a vertical circle. Assuming he starts from rest when the rope is horizontal, find the tensions on the rope that are required to make him follow his circular path,(a) at the beginning of his motion, (b) at a...

I've had this idea for a while. I can't see anything wrong with it. Maybe someone here can tell me if it's unsound. The idea is based on the dimpling of a golf ball. To my knowledge the dimpling of a golf ball reduces air friction and let's it go farther. I even heard of someone dimpling a...

I've got an idea for a science project that I thought I'd run by you. I was walking home one day in the rain and I thought to myself, would I get more wet if I walk or run? At least initially I plan on ommiting wind... if I can get a handle on it then I'll add this to the mix. There are some...

In Goldbarz thread, CarlB voiced this idea: this is a possible response to Fermi's question "where are they" or to the apparent Silence. what's your reaction? BTW it is not as optimistic as it sounds right off because he just says "be able" and we might have the potential but fail to do...

how do i get to solve this integral,i have no idea whatsoever so no one should expect what i have done.it was presented to me by a colleague [x^(1/x)]^[x^(1/x)]^[x^(1/x)]^[x^(1/x)]^[x^(1/x)]^[x^(1/x)]^[x^(1/x)]...