Concepts Definition and 403 Threads

Hi All, From electromagnetic theories, with the Lorentz gauge condition for the magnetic vector potential, I get the following wave equation: 1/csquared * d2A/dt2 + del2 A= u0 j. in some literatures, they ignored the d2A/dt2 term and I don't know why they can do that...

Maybe I'm just really dense here but can someone please explain to me all these offset concepts like what does it mean to add a DC offset and what does adding a DC offset do to an AC signal? For instance, adding it to a sine wave or whatever other waveforms and decreasing it. Can someone...

Hello I'm stuck on two momentum concept problems and can't figure them out, I was hoping someone could provide help. 1.A small truck and a large truck have the same kinetic energies, which truck has the greater momentum? Justify your answer. Well i know Ek=.5mv^2 and that momentum p=mv...

I needed to ask a range of questions about gtr without resorting to the complexity of trying to learn about the formalism on a forum. Many good responses were given to other questions on this forum but the inherit complexity of the situation still left room for misconceptions. Consider a...

Here they are... (1) A hand exerts a constant horizontial force on a block that is free to slide on a frictionless surface. The block starts from rest at point A, and by the time it has traveled a distance d to point B it is traveling with speed vB. When the block has traveled another...

Hiya, Ok I have several concepts I've tried to undestand but still can't seem to get how it works... :confused: 1) In sports, you see people "hang" in the air? What exactly is the mechanism behind this...All I can understand is that say a basketball player is jumping and his legs are bent...

Again, these concepts we discussed in class, but I still do not get them. Can anyone explain why they are true? 1) Will the acceleration of a car be the same when the car travels around a sharp curve at a constant 60 km/hr as when it travels around a gentle curve at the same speed? Explain...

A car of mass 1348kg moving with a velocity of 26m/s collides with a car os mass 674kg moving with a velocity of 21m/s in the same direction. after they collide the 674kg car moves with a velocity of 5.25m/s What is the velocity of the 1348kg object? M1 = 1348kg M2 = 674kg V1 =...

I am not sure how to do this problem without using netF=ma. Three objects with masses, m1 = 5 kg, m2 = 10 kg, and m3 = 15kg, are attached by strings over frictionless pulleys. The horizontal surface is frictionless, and the system is released from rest. Using energy concepts, find the speed...

This journal is the journal that will record my progress through the text: Basic Concepts of Mathematics by Elias Zakon It can be downloaded off the internet with a simple search on Google. I spent the entire summer doing no mathematics, and I lost my drive to doing higher mathematics...

the velocity of light is actually the velocity of free space. 186,283 mps was attributed to light instead of non-dimension space. Space dragging was attributed to mass instead of to non-dimension space, Space twisting was attributed to mass instead of to non-dimension space, Geodetic...

After being surveying a bit I have found some other concepts of shuttle proposed by ESA-EADS and Russia. Some time ago I heard that ESA was testing a new unmanned RLV called Phoenix, which was an small scale model of Hopper. This model comes to substitute the Hermes, which was never built. It is...

has anyone ever seen or heard of these concepts? the velocity of light is actually the velocity of free space. 186,283 mps was attributed to light instead of non-dimension space. Space dragging was attributed to mass instead of to non-dimension space, Space twisting was attributed to...

Is this book by Stewert good as a first calculus book?

Hi everyone, I just thought that it might be useful for everyone if we go through the concepts from the book of mechanics by Mr. Timoshenko. Its a great book. Some people from this forum advised me to refer this book for mechanics. I find it very useful. But I would like to write about the...

I need help coming up with all physics concepts dealing with the mousetrap car and I need the equations for those concepts. Plz Help Thnx

take a randomly drawn surface,put some charge inside it,this surface should be having some sharp features.if this thing is a metallic surface then it 's surace will be equipotential,due to this charge density on the sharp points will be the maximum,therefore electric field just outside this...

take a randomly drawn surface,put some charge inside it,this surface should be having some sharp features.if this thing is a metallic surface then it 's surace will be equipotential,due to this charge density on the sharp points will be the maximum,therefore electric field just outside this...

I'm trying to collect the 10 (at most, 7 optimum) most important concepts of physics in classical mechanics. If you were left with 7 different concepts, what would you pick? (Assuming you have to live the rest of your life with the 7 concepts that you picked) This is "just for fun", not a...

Not really understanding these concepts. Consider the following relation on the set of all circles in the xy plane: A ~ B if and only if the center of circle A is inside circle B. Is ~ reflexive? Is ~ symmetric? Is ~ antisymmetric? Is ~ transitive? Prove answers. Consider the...

I have a bit of a hard time with these concepts mathematically and if i can have one person explain it would be a bit lighter on me and i would appreciate the help I just need in steps the way you would go about working this out: Q:the Earth is about 150 million km from the sun, the apparent...

Salutations everyone, Thank you everyone in this community for taking the time to read my message. I am a third grade teacher in Moreno Valley, California USA. It is my conjecture as a third grade teacher that the encoding during reading in constructing meaning from words is similar to the...

1. What is the use of deflagrating spoon? 2. What is the difference between copper (II) sulphide and copper (III) sulphide? (I don't understand what the II, III or IV mean) 3. What is the term for the converse of sublimation? thanks

1) what is diff between osmolarity and molarity? is osmolarity the difference of molarity in a cell and the outside? 2) are both enzymes and substrates pH specific? i know that enzymes are, but are substrates pH specific too? 3) increassing enzyme concentration increases the...

During most of the 19th Century physicists believed that atoms were the smallest particles of matter and thus couldn’t be further subdivided. With such characteristics, an atom of one element obviously couldn’t become an atom of another element – a process they labeled “alchemy”. J. J...

if you increase the # of yeast cells, then how will it affect the ATP production of cells if the sugar concentratin is held constant? If u substitute galactose for glucose, then how will the rate of atp production byh the cells be affected if the amt of yeast in the experimenent is held cosntant?

It seems to me, after reviewing some old threads where Astrology was debated, that there are (at least) two different basic concepts of the study. On the one hand, there are those who think that the planets and stars (and their relative positions) has a direct effect on us (our...

Can anyone correct me if I am wrong? This is basic basic basic basic basic basic biology, and i am just trying to refresh my memory and make sure that i am stating the correct facts 1) General concepts about tonicity ---- Lets say for example, we have a red blood cell exposed to solutions...

Does it make sense to speak of the probability of finding a system which was once in the ground state in a higher state after a certain time? Since the Hamiltonian depends on time, once you collapse the wavefunction at that time, the energy you get can't be one of the values of the unperturbed...

which of the following will most likely be disrupted by a change in pH? 1) hydrogen bonding 2) ionic bonding 3) hydrophobic interactions 4) disulfide bonds 5) neither -I'm pretty sure its not 1) and 2) since changing the pH won't affect the electronegativity of an atom...Pretty sure...

Are my concepts right? -air is the damping force in oscillatory motions also, in what conditions is Hooke's Law invalid? thanks

Hey everyone, This term I'm enrolled in E&M which is a subject I've never formally learned anything in but I've loved for years and gained a lot of practical knowledge in (I'm a Ham radio junkie). Now I'm one week into the course and I really like it but there's one problem that needs to be...

I am taking General Chemistry right now, what parts of chemistry are important in the last two years of a physics BS degree?

Hello. I need some help bec. I don't quite understand about this interference... What is all about that interference pattern formed by a diffraction grating? Also, are there factors that affect the kind of pattern that a kind of diffraction grating forms?

If time and space are relative concepts than how can you qualify both of them in terms such as for example (a) the Big Bang happened 13.7 billion years ago, (b) he took 10 seconds to run 100 meters (c)the shortest distance to that place is 7 km Wouldn't all these claims be stating time...

One question has disturbed me long time, I don't know the distinction between quantum electrodynamics and quantum field theory. By the way, which quantum field theory or quantum electrodynamics textbook is prefer?

I'm a week or two away fromt the end of my vector calculus class and we are covering topics like surface integration, green's theorem and such. The problem I'm having so far is that everything just seems so disjointed and ad hoc, with all these theorems I feel I have to memorize instead of...

Hi, In the attached address ( http://www.geocities.com/complementarytheory/M_E.pdf ) you can find my reexamination of fundamental mathematical concepts. Please read all of it before you air your view about it. Thank you, WWW

Re: Background to Universal Quantum Field Geometry and Parallel Singularities Higher Intelligence travels from universe to universe through electromagetic sinks or points of gravitational collapse. Communication with parallel worlds that are moving faster than light through these points by...

Until the mid-1980s, the understanding of the development of animal life was that it had followed the logical path of a gradual evolution with more simple phyla over eons leading into more complex phyla. With the rediscovery of fossils held quietly in the dusty drawers of the Smithsonian...

Hi...we are doing this now in math. Our teacher insists on writing every possible outcome in a random experiment, which is proposterous. Why write out and literally count something that is fully calculable? I can get some things pretty well. We'll have questions like "4 coins are flipped"...

I'm in a thing call TEAMS Engineering. Basically there's 8 people on a team and we get 1 hour 30 mins to answer questions about 10 college level engineering problems (each w/ several questions) (we're are in high school). We're allowed to bring in any texts/info we want but it's so hard 50% is...

I have a test on Monday. I am still having trouble with the following concepts. ***Please remember I am just taking the physical science kind of physics.*** Q. For the astronauts inside the orbiting space shuttle, there is no force of Earth's gravity acting on them. True or false? A. Answer...

How am I supposed to figure out these concepts? No problems to do, but I'm just not understanding the material/concepts? anyone care to explain/teach me? 5.) Weight of a man who is throwing a bag of potatoes? 7/8) Net acceleration of a body on a curved path 10) Kinetic energy of a...

How am I supposed to figure out these concepts? No problems to do, but I'm just not understanding the material/concepts? anyone care to explain/teach me? 5.) Weight of a man who is throwing a bag of potatoes? 7/8) Net acceleration of a body on a curved path 10) Kinetic energy of a...

Hello , it's me again. It's about proving linear aalgebra concepts. 1. Show that if A = A^-1, then det (A) = 1 or -1. 2. Show that if A^T = A^-1, then det (A) = 1 or -1.

In the contemplation of values we must distinguish between that which is value in our being and that which HAS value. I ask - what is the difference? ---------------------------------- The difference by my theory is: Value can never be static; meaning that experience adds to...

[SOLVED] 2 concepts of Time Travel My concepts are based on Logic (not on physics nor mathmatics); Note: Sorry for my spelling. I don't use English much. 1. The balloon Theroy Ones needs to always look at the universe as a connections of mass elements. All elements follow a straight...

p and q are real numbers. If p < q then [p,q] = {x : p <= x <= q} or (p,q] = {x : p < x <= q} or [p,q) = {x : p <= x < q} or (p,q) = {x : p < x < q} . A single-simultaneous-connection is any single real number included in p,q ( = D = Discreteness = a localized...

Hi, To check a bijection between two sets, we have to look at the contents of the two examined sets as if they are discrete elements, otherwise we can't use the bijection method. |R| = Continuum, so my question is, how can we check if there is or there is not a bijection between |Q|...