Concept Definition and 1000 Threads

Ok, Suppose I have two balls that come into contact to make their charges say q1=q2. Would the charges be equal if the balls were of different size? I'd say yes, because mass is not relevant in Coulomb's law.

hi there, just some questions to stimulate answers, looking for allll different types of responses, so- go ahead and answer! Does sin exist? What is your understanding of sin? Is sin the same as the concept of wrong? Where did your understanding of right and wrong come from? Are the seven...

the questioon is this: A balloon of radius 34.5 cm is sprayed with a metallic coating so that the surface is conducting. A charge of 1.05 × 10-08 C is placed on the surface. What is the potential on the balloon's surface? how i solved it: -apply the guass law, which gives me the Electrical...

Another view of the concept of "time." Dear Friends, I am new to these most interesting forums. I am very pleased to have discovered them. Perhaps I can add a subject that might also be of interest? Some philosophers, theologians and even some scientists seem to feel that "time"...

Hello all I was just wondering if an object is stationary, how can it still possesses kinetic energy? Is it due to the reference frame? Does everything possesses kinetic energy? Thanks

Alright, I absolutly do not understand this concept. I missed the lecture and the textbook does not seem to explain it very well. Here is a sample question: Two particles, each with mass m = 1.10 kg, are fastened to each other, and to a rotation axis at O, by two thin rods, each with...

I have always thought of the cocept of probability as a bit weird and thought I could post up a few questions to do with the basic concepts of probability and see how they can be mathematically proved. Here goes: 1) The method of measuring probabability we use, with 0< or = P < or = 1; is...

Consider two situations: 1) You are driving 50 mph and crash head on into an identical car also going 50 mph. 2) You are driving 50 mph and crash head on into a stationary brick wall. In neither case does your car bounce off the thing it hits, and the collision time is the same in...

A ball of mass m is being pushed off the top of a frionctless semi dome by a small negligible force. Find the angle where the ball left the surface. I know how to solve this problem, but I don't understand the concept behind it. Why does the normal force have to equal the centripeal force...

I had a conceptual question. Say I have a ball and I throw it against the wall and it bounces back. I have initial values for its velocity but not for the final velocity using the \vec{P}=m\vec{v} I noticed that momentum is not conserved. Well if momentum is not conserved then that means it is...

I have a question which puzzles me since the day my tutor pointed out to me. A uniform solid disk is set into rotation with an angular speed wi about an axis through its center. While still rotating at this speed, the disk is placed into contact with a horizontal surface and released as...

would someone explain to me the concept of space time? i know what it is but am having problems understanding it

We did a lab to illustrate this concept in class. The problem is I have no idea what this concept is trying to show. Basically the length of a string was altered from 30 cm to 80 cm. Then, at a 90 degree angle from the vertical of the pole housing the meter stick and the attached string, it was...

I'm a high school student and am a junior right now. I like physics, and quantum theory, perhaps because it will be our future. Therefore, in order to understand it, I need to know calculus. Since I don't have homework, I don't work out the problems. I try to understand the critical...

Im having trouble grapshing this concept. Can anyone please explain what voltage across two points means. Does it mean that one point is at a higher potential energy than the other point? Does it mean that the charges present are closer to the point a, and thus produce a stronger net force when...

I have one (hopefully) quick question for anyone out there willing to help. What's the difference between putting a pair of coordinate points, for example (3,4) in parentheses () and putting the between a bracket and a parenthesis like [3,4). Please respond soon because I need to know for...

lets say a structure has 3 resonance structures, i konw that the atoms don't move, but i read somewhere that the electrons do...hmmm and that the resonance hybrid is most stable ofthe resonance forms?? I am confused, what exactly is resonance? in actuallity, isn't there no resonance , just...

Which uses classic generators with a lot of friction. Also friction is the result of gravitation. An electronic engineer told me a classic generator uses about 30 to 35% of it's power to create the rotation against the electro-magnetic field. He told me that he never saw something similar to my...

here is the question: The density of gasoline is 730 kg/m^3 at 0 degree celsius. Its average coefficient of volume expansion is 9.6e-4. If 1.00 gallon of gasoline occupies .00380 m^3, how many extra kilograms of gasoline would you get if you bought 15.0 gal of gasoline at 0 degrees celsuis...

ok i got back my test today and its some basic stuff, but i don't get the difference between AVG speed and AVG velocity. One of my problems was 'The length of the barrel of a blowgun is 1.2 meters. Upon leaving the barrel, a dart has a speed of 14 m/s. Assmuing that the dart was uniformly...

hi, i'm reading brian greene's "the fabric of the cosmos" and in it he explains what a higgs field is. he says the potential energy of the field is shaped like a bowl with a raised peak at the center of the bowl. further he says the vertical height above the bottom of the bowl represents...

Recently, the Biology section of PF got a new thread, Cranial Size and Intelligence. One exchange in that thread concerned the 'intelligence' of species other than Homo sap. Clearly, not wearing a biologist's hat, each of us may be able to give a description of what we think the intelligence of...

Can someone put into plain english the following points: 1. What is the concept of Gauss' physical law. 2. Why is the rotation of an electric field zero. Cheers

What is "quasi particles"? Any ways to visualize this concept? I have so many troubles with this . Need your help, guys. :blush:

I think mass is attracted to the center of a 4th dimensional hypersphere (time neglected). Where there is a 4th spatial dimension. If by some craziness there was both an attraction betweent objects and the center of this 4D sphere, and objects to other objects(in the 4D) then you in theory could...

Are the social sciences unbound by the physical sciences? Take the laws of Thermodynamics that breaks the universe down to matter and energy. Those laws are predicated upon a closed or virtual closed system. Thus, how can these physical laws not ultimately affect human social existence? I...

1.) SYMMETRY (think a arm or leg extention) + REACTION (think a cupboard) = proportion 2.) Question: Water (action) + a Cup's Rim (reaction) = what Proportion ? Answer: A plural format. 3.) Symmetry is a case of action and reaction = proportion. 4.) Merriam-Webster Online...

Interesting new concept car-runs on compressed "air" link here : http://www.theaircar.com/ thoughts ?

http://en.wikipedia.org/wiki/Hyperspace Are there any mathematical explanations to this sci-fi concept of hyperspace? Can there be? What do you think?

Okay here's the problem: A picture hangs on a wall suspended by two strings. The tension in string 1 is 1.7 N and is at an angle of 65 degrees above horizontal (from left). String 2 is at an angle of 32 degrees above horizontal (from right). The strings connect to the same point that holds...

I've posted a lot here in the past on the concept of mass in relativity. All of my posts were neccesarily inadequate to due justice to the concept. I've put off being precise on the concept until I as finsished with a manuscript I wanted to write on this subject. I completed it and have put it...

Hi All, question: A wire of length 1 m has a resistance of 0.3 ohm. it is uniformly stretched to length of 2 m. what is the new resistanct? I'm not sure how to express the concept / equation? pls guide me... Cseet

Earthman: x stands for an actual thing; therefore x cannot be used together with {} if we mean that {} is the notation of the empty set. Shortly speaking, {} is our notation of the empty set and {x} is a general notation for a non-empty set. Martian: x stands for general notation of any...

Martian mathematician visiting Earth, and he wishes to know how an Earthman mathematician understanding the limit concept. After couple of hours of communication we get this situation: 1) a not= b Earthman: By my way (1) is a hypothesis. Martian: By my way (1) is an invariant...

Hi. I recently started learning physics on my own, and I'm having a bit of a problem with the concept of tension. That is, I'm not exactly sure what it is. In the textbook I bought, tension is defined a bit hastility in a section entitled "Applications of Newton's Laws." I grasped the...

The federal government will create a Health Care Oversight Agency with 1 representative from each state and employees with all necessary skills. The president will appoint the director after the first year following a presidential election if a 9-year tenure has transpired. The appointment will...

"Frege's main goal was to improve the foundations of mathematics and scientific work in general. In attaining this goal he invented a artificial language (Begriffsschrift), which were itself a milestone in human intellectual history. The Begriffsschrift makes use of a logical notation that...

Two keys that will help anybody seeking TOE. 1. The key of complete understanding the concept of electric charge. 2. The key of complete understanding the concept of mass. The 1st key does have a lot of supporting direct evidence for its existence. The evidence for the second are mostly...

Hi everyone! Time has come for my first thread in this nice forum: I wonder if someone could explain the concept of virtual photons (and virtual particles in general)? Have I understood it right that they are just a mathematical construction and are not in any way "real"? I have a lack of...

Hello, I am taking a Natural and Physical Sciences course. As math and sciences aren't my strongest subjects, I am really struggling, reading things over and over again, and they are just not sinking in. For example, I understand the acceleration of gravity - g. I think that something can...

Hi. I have always always been intrigued by the concept of teleportation and with the recent advances in quantum teleportation at the University of Innsbruck the results are encouraging. However, it should be noted that this form of teleportation doesn't allow physicists to teleport the photon...

As theories go, here's something new. A very simple foundation theory based on Energy, with free software to back it up. http://www.gamert.co.uk

Ok, just something that sort of bothers me... Everyone says the past is like... concrete, we know what happened and blah... and the future is unknown... well unless we get into predestination of something... but usually past known, future unknown. And to me... past and future... really its...

So here is the problem Two cylindrical rods, one copper and the other iron, are identical in lengths and cross-sectional areas. They are joined, end-to-end, to form one long rod. A 12-V battery is connected across the free ends of the copper-iron rod. What is the voltage between the ends of...

What is the simplist concept in mathematics?

i'm jux wondering would a laser mounted on a spaceship traveling at half the speed of light... wouldn't this make the speed of the laser on the ship change to 1.5c?? thx

hmmm, here is a very elementary concept to most of you. The situation is that a live wire comes into contact with the metal casing of a fan which is earthed. Connected to the live wire is a fuse of rating 5A. Since it is earthed, the excess charges will be conducted away. This will pose no...

For the past few thousand years or so, the philosophy of space has occupied a lot of time among philosophers. There is really no argument as to the traditional definition of "space" as it usually relates to volume, being length width and breadth. But the big debate has typically been over the...

I've been trying to do these concept-based questions, (but I think my concept isn't that sound). "Suppose f'(2)=4, g'(2)=3, f(2)=-1 and g(2)=1. Find the derivative at 2 of each of the following functions a. s(x)=f(x)+g(x) b. p(x)=f(x)g(x) c. q(x)=f(x)/g(x)" I began doing this, without...

Since I defend the concept of mass when it comes up I thought it might be of interest to others to note something very interesting. In Einstein's paper "On the Electrodynamics of Moving Bodies," of 1905 (http://www.fourmilab.ch/etexts/einstein/specrel/www/) he made an error on the value of...