Edge Definition and 253 Threads

Homework Statement To remove a bottle cap, a student exerts a force of 40 N on the opener. What is the force on the exerted edge of the cap by the opener? http://img225.imageshack.us/my.php?image=22965751hd6.png Homework Equations sigma(Tccw) = sigma(Tcw) t=r*d The Attempt at a...

1. The slant edge of a right circular cone is 6 cm in length. Find the height of the cone when the volume is a maximum. 2. Find the maximum volume of a right circular cone whose slant edge has a constant length measure a.

Hello, recently I was listening to a radio talk given by Professor Brian Greene. I have always been able to understand him in his books, but on this particular occasion, he said something that I couldn't quite understand. He said that there is no edge to space, only an edge to time. If the...

or are they 1/8 of a sphere at the corners and 1/4 of a sphere at the edge?

The answer, I am told, is 'No'. But I do not understand why. Assume: (1) The Universe is spatially flat. It will one day stop expanding. (2) There is no weird dark energy. These are, I think, plausible assumptions. Then: What evidence is there to weigh against the conclusion that...

Urgent ...please Help! I have to make test corrections in my physics class and i leftmy book at school and i don't know how to do 5 problems and my grade is basically dependig on this...ill gie one of them and if anyone can help thatd be great! thanks! a model rocket flies horizontally off...

I was just wondering, how long would it take to travel from Earth to the edge of our solor system if we were traveling at the speed of light? and how long would it take to get from Earth to the furthest we can see into space at the moment?

Does anyone have an idea as to the relative abundance of each of these types? Why will one type occur over the other in a given situation? Thanks, -Scott

Can anyone give me some examples of some of the most cutting-edge/futuristic/"we're not there yet" applications for semiconductors? You know... the "exciting" stuff. :biggrin: I'm doing an informal presentation for my solid state class, and wanted to get some ideas of what I should research...

I found an interesting explanation for rotational speed of the galaxies in the below link at section 7.1 http://www.ag-physics.org/gravity/ Can anyone comment on this ?

Since the outer boundry(s) of our expanding universe are moving at a less than the speed of light rate there must be light waves generated in our universe that travel to the limits of our expanding universe and reach the "edge" of it. What takes place when they reach this edge? Can they "bust...

The mathematics passes me by, so please be patient. I have an idea that may have been posited before, but I've not seen it. Could it be that the expansion of the universe as we see it is only a relatively minescule fraction of the whole expansion? I have a mental image of the gaseous...

Homework Statement I am unable to understand the working of a positive edge triggered JK flip flop. In the figure, there are 2 AND gates on the left (one over the other) and there are 2 NOR gates on the right (one over the other). I have used an RS flip flop to construct the JK flip flop. The...

Homework Statement I have 2 blocks of mass M one on a frictionless horizontal surface the other hanging over the edge of the surface connected by a string of length l. The string goes over a pulley of mass m. Find the acceleration. Homework Equations PE = mgh KE = 1/2mv^2 The...

Homework Statement A 17N spool has an outside radius of 20 cm and an inside radius of 6.4cm as shown. What horizontal force on the rope(wrapped around the inside radius) will be required to pull the spool over an 11cm edge? http://img299.imageshack.us/img299/6105/27kl1.png Homework...

Does anyone have a problem with order at the edge of chaos being the explanation regarding the way the universe operates if yes then why? The reason i am asking this question has to do with a philosophical debate i am having with a group of people.

I am trying to calculate the energy at which the Compton edge occurs for a sample of Cs137 using a NaI(Tl) scintillator. I know the original energy of the gamma ray was 661.6keV. and that for the Compton edge the angle between the electron and the line of incident must be 0degrees (for max...

The question is "Two identical uniform bricks of length 18 cm are stacked over the edge of a horizontal surface with the maximum overhand possible without falling." |<-- 18 cm -->| +-------------+ | block 1 | +-------------+ +-------------+ | block 2 |...

http://www.space.com/scienceastronomy/060523_heliosphere_shape.html So if it does get will we still have contact with it

I am having trouble finding the surface area of a cube with the length of each edge equal to x+1. can some one help?

This might belong in Cosmology, but I'd thought I'd start it here. Astronomers Find Molecular Hydrogen At Edge Of Universe http://www.sciencedaily.com/releases/2006/05/060508112217.htm Well OK, but . . . No $#!t ! Thoughts?

Kaku's 'Hyperspace' is currently inspiring my higher-dimensional imaginings. I'm trying to imagine what one would see in a closed, unbounded hyperspherical universe. I know of the conceot that, if you look far enough, your image can wrap around the universe so you're looking at the back of your...

Everywhere I've looked, it says that the universe is at, getting to, or already past the speed of light and quickly accelerating. Can we ever get to see the edge of the universe? Could we see it as it was in the past, because it seems we will never see it in the present?

Hello, Here is my what am trying to solve. Express the edge length of a cube as a function of the cubes diagonal. Then express the area as a function of diagonal length if the side is x. This is what i know. The area of a cube is 6x^2 where x is the length. But in the problem i have...

http://www.edge.org/q2006/q06_print.html#greene Brian Greene writes, "If true, the idea of a multiverse would be a Copernican revolution realized on a cosmic scale. It would be a rich and astounding upheaval, but one with potentially hazardous consequences. Beyond the inherent difficulty in...

http://www.edge.org/q2006/q06_4.html#smolin every year Edge magazine chooses the Question of the Year and asks 100-some smart original-minded people and they get all different answers this year the question is what do you think is a dangerous idea? this is Smolin's answer...

I have read from Universe by Freedman, Kaufmann that our universe is largly flat so it would mean there are edges in our universe. Our universe would be like a flat piece of paper that is continually expanding. A more realistic picture might be a diagram of Einstien's fabric of space time which...

If the universe is expanding, meaning that space-time itself is expanding, what would you see if you were at the edge of space-time looking out? Would it just be blackness? Would there even be a boundary from our perspective? And if you were at the edge, what would happen if you tried to move...

I know I'm reposting this... but no one seems interested in my thread.. maybe becuase it already has replies (which doesn't mean its been solved!) but whatever cube is placed with its edge at (0,0,0) as in the diagram. The sides of the cube are1 .4m. Find the electric flux and the charge...

Hi there, I am currently learning about the quantum hall effect and am a bit confused about the edge states picture and how this fits in with the rest of the theory. In most books/review texts the theory is dicussed from the point of view of an infinite 2D system the magneteic field collapses...

My son has asked me a question I cannot answer. Can someone help? Does any given point on the outer edge of a CD (or any spinning object, like a record album), turn at a faster speed than a given point on the inside edge, because it is going a farther distance in the same amount of time...

Please help me answer my son's question: It seems as though the outside edge of a spinning CD is moving faster than the middle of a CD. This can't be true, right? Why is it not true mathematically speaking? Thank you. Donna

OK, for once, *I* don't quite know where to put this (since it covers almost the whole gamut of issues). I'll move it if I find a good suggestion on where it should go. In any case, if you are in the US, or any vested interest in how poorly civilian scientific endeavor is being supported, you...

This one's just cute, but it's pretty easy (did it on a napkin at McDonald's when I was bored :rolleyes: ). We all know that given a line segment, we can easily construct a perpendicular bisector with a straight edge and a compass. The challenge is to construct a perpendicular bisector to a...

I know that because of the rolling constraint, V(cm)=R*w [w=omega]. Also, if I want to find the velocity of particle i, i can sum V(cm) and V(i, relative to the center of mass). But how do I determine V(i, rel)? For example, if I am given the speed and radius of a wheel, how fast is a point...

I'm requesting help for a physics problem I have made up. Let's say we put a ball on the edge of a table, with the center of the ball being a teeny weeny bit outside the edge of the table. In other words, if we have a coordinate system, the edge of the table is at 0,0, the center of the ball...

A narrow parallel incident beam of light falls from the left on a solid glass sphere at normal incidence. The radius of the sphere is R and its index of refraction is n = 1.52. Find the distance of the image from the right edge of teh sphere Hint was to treat the sphere like a thin lens Since...

first of all I would like to say that this is a question to which I do not have the answer... imagine that you are building a set of stairs for an ant out of a deck of n cards... what is the greatest horizontal distance from a table out over an abyss that can be covered over by the cards...

Question about the "edge of the universe" Okay, the farthter away you look, the farther back in time you are seeing, right? When you talk about seeing some object 11 billion light years away, you are seeing something as it existed a long time ago. So, since the universe is expanding, that...

There was a great one by D. Williamson near the bottom of this page http://www.edge.org/q2005/q05_3.html http://www.edge.org/q2005/q05_3.html#williamson And another great one by J. McWhorter, the third from the top of this page http://www.edge.org/q2005/q05_9.html...

"Computer simulations show a close encounter with a passing star about 4 billion years ago may have given our solar system its abrupt edge and put small, alien worlds into distant orbits around our sun." http://www.astrobio.net/news/modules.php?op=modload&name=News&file=article&sid=1330...

http://www.timesdispatch.com/servlet/Satellite?pagename=RTD%2FMGArticle%2FRTD_BasicArticle&c=MGArticle&cid=1031779515094

And what will we find there? Maybe us. What would be wrong with considering that we ARE on the edge of the universe! After all every where we look we can only see into the past where thinks get smaller and older the further away they are until reaches the very small BIG BANG space. The...

A uniform chain of length 8.00m initially lies stretched out on a horizontal table. a) If the coefficient of static friction between the chain and the table is 0.600, show that the chain will begin to slide off the table if at least 3.00m of it hangs over the edge of the table. b)...

"Review of Cosmic Vision 2015-2025" begins: "The Cosmic Vision workshop at UNESCO on 15-16 September 2004 showed that Europe is richer than ever in ideas for what should be done in space science in the coming years. This workshop brought us a major step forward in developing the vision of the...

How would you describe the limits of physics?

Does anyone know what would be in a field that would have a light on it, except its a structure and not a house, it had 3 lights on it in odd places.I couldn't tell what it was.I don't know much about farming or anything like that but the fields on the edge of my town are growing crops and...

I know that there is a way to bisect an angle using that equipment, but is there a way to trisect it. I have heard it is possible to do it by constructing a regular polygon with sides of a multiple of 3 around the angle. Does any1 have anything?

What happens to light when it reaches the edge of the universe? it couldn't keep on traveling into nothingingness could it? becuase that nothingness would be space. it couldn't reflect off something unless there was matter at the edge to reflect off. the light must do something, it...

Would you want to see cutting edge theoretical debates? Howdy everyone, I am doing a little bit of 'research' for a website idea of mine and I am very very eager for some feedback on it. Essentially I want to know if you, the people of our world who are interested in...