Couple Definition and 445 Threads

I'm not sure if these have been looked into extensively (they probably have, I just have a hard time finding them), but I was just wondering about a couple conjectures I thought up and tested by hand for a bit. Matlab can't run it for very long. Let me know if anyone finds a contradiction or if...

So, last week I was working with a raman microscope, specifically using it in a photoluminescence experiment, and for about 20 minutes I was suddenly getting responses a couple of orders of magnitude higher than I did before or after. What's even stranger is that the guy on the desk across...

For the first question it deals with onto functions I was able to do a-e which deals with actal numbers. Then questions E stumped me. I have no idea what to do or even how to start. It reads: Let C (n,m) be the number of onto functions from a set of m elements to a set of n elements, where m >...

[SOLVED]A couple of sphere problems Hi again, I've been studying for my midterms, and in the review exercises I came across a couple questions that have me stumped... How would you guys approach these problems.Ex1: The larger sphere is radius of 4, with the middle point of a second sphere on...

update: *edit: solved! I counted everything twice. Homework Statement How many ways are there to seat 10 people, consisting of 5 couples, in a row of seats (10 seats wide) if all couples are to get adjacent seats? The Attempt at a Solution I'm trying to look calculate it...

http://imageshack.us/a/img842/2497/112639506.jpg Calculate the resultant force’s magnitude and the couple moment. Let a = 3.70 m w1=5.35kN/m w2=4.00kN/m The resultant force of the triangle is 1/2(3.70)(5.35)=9.898 kN The resultant force of the rectangle is (4)(3.70) = 14.8kN So...

Homework Statement I am confused with sets- just wanted some clarification. Say, I have a set A={b, {1,a},{3}, {{1,3}}, 3} What are the elements of set A? What are the subsets of set A? Are the subsets also the elements of the set A? The Attempt at a Solution I think the elements of the...

Hello, I'm studying digital integrated circuits and I'm new to solid state physics. I've studied PN junctions, drift and diffusion currents, now I'm trying to see these subjects in terms of energy bands and I'd really appreciate it you could explain to me a couple concepts. When two materials...

Basically, I was messing with my calculator, and i thought of this: sqrt(x^sqrt(x^sqrt(x^...)))=sqrt(x)^sqrt(x)^sqrt(x)^... where they go infinitely. I can't prove it, so I need help. another thing is 1/(a)+1/(a^2)+1/(a^3)... = 1/(a-1) Perhaps the proof is something really obvious...

Like the tittle says.. I am practicing and wanted to make sufre I did it correctly. Forma this excersice the only doubt es en the las parte ( parte 5)... I am not sufre but i think I need to use .005 rather than .05

Hi, is it true that: 1. when virtual particles/antiparticles come to existence every billionth particle survives? is it the reason why the universe consists of particles rather than antiparticles? 2. when virtual particles annihilate the energy gets absorbed by the vacuum in contrast...

the electric field inside a solid charged conducting sphere is always zero for obvious reasons. the electric field inside a solid uniformy charged nonconducting sphere is nonzero and varies at all points. since it's nonconducting, the electric field at a certain point still won't move...

INTEGRALS 1.\int^{\frac{\Pi}{2}}_{0} \frac{x}{sin(x^2)} \, dx 2.\int^{\infty}_{-\infty} \frac{1}{t} \, dt 3.\int^{2}_{1} \frac{1}{xln(x)^4} \, dx RESOLVING THE INTEGRALS 1. I firts resolved the definte Integral and then applied the \lim_{b\rightarrow +0}...

1.assume i am riding a motorcycle at 100km/h, but i ride the motorcycle inside a very long train which is moving at also 100km/h. What speed do i have reported to the world? 200km/h? 2.what happens at a short circuit? practically there is no resistance so the value of the current is infinity...

Homework Statement Homework Equations I know torque of a couple = One of the forces x the distance between the 2 forces. The Attempt at a Solution I don't know how to approach this blasted problem. Any help would be very much appreciated.

I think I know the answer to these questions, but I just want to make sure. 1) If A is invertible then A+A is invertible. True/False True. Because det(A)≠0, det(A+A)=det(2A)=2^n * det(A)≠0 Is this correct. 2) A 3x3 matrix can have 2 distinct eigenvalues. True/False True, although...

Homework Statement I have an assignment where I must solve a coupled system of equations, with differential interdependencies (e.g. a system of ODEs) of dimension no less than three (e.g. in x; y and z). choose a system relevance to Aerospace Engineering, or some applied topic. You must use...

Homework Statement A current flows in vertical square coil whose plane is at right angles to a horizontal uniform magnetic field B. The coil can rotate about a vertical axis. Which is correct A) The forces on the two vertical sides are equal and opposite. B) A couple acts on the coil C) No...

Homework Statement Okay, so I need some help with this Matlab program. I never learned Matlab, so I'm trying to do it as best as I can. The question is: Calculate the 2nd and 3rd degree Taylor polynomials for the function f(x)=ln(1+x) about the point a=0 Plot these polynomials and the...

Homework Statement Hi, i am trying to understand how to find the reactions (Ra & Rb) and moments (Ma & Mb) of the beam shown in the sketch below. Not an exact number but in terms of Mo(couple moment) and L(length). Homework EquationsI have the answers which are Ra = -Rb = 3Mo /2L AND Ma...

In another thread (on Oppenheimer-Snyder collapse), I posted a link to some lecture notes on gravitational collapse. Checking on the author, I find he is extremely prolific on many fundamental areas of GR (from the computational standpoint). Of particular interest...

Hey everyone. I want to take a Bsc in physics or a Beng. 1. If I take engineering can I do a graduate degree in physics? Or is that dependant on which engineering degree I get eg. Chemical eng vs physics engineering? 2. If I start with a BSc in physics can I switch to a Bachelor’s of...

The electron -- couple questions Couple questions on the electron: First, as an accelerating charged body, an electron radiates electromagnetic energy in the form of photons (wiki). But I learned that photons are only emmited when an electron transitions energy states. It would seem to still...

1) I have read that theory suggests infinite amount of universes and I have also read that the theory suggests a finite amount of universes. Which is the right one? If for every decision new universes are born, the number should be finite, right? 2) In quantum mechanical sense, is it correct...

Homework Statement In the figure F1= 27.9KN, F2= 39.8KN, F3= 61.8KN What distance d is required for the net couple moment on the triangle to be 1140 counterclockwise? Express your answer to three significant figures and include the appropriate units. link to image http://imgur.com/cBnLJ...

Hi, I have a couple of easy questions related to quantum mechanics. 1.Does ionization itself cause radiation and why? I know that when electron collides with an atom it can remove electron if it has enough kinetic energy. And when atom becomes excited and then returns to the ground state it...

Hi, I know how to calculate the reaction to a force couple supported by 2 points. But what if it is supported by a line. See example attached. How do I figure the force distribution along the constant support? Thanks

What is the difference among moment, torque and couple? Moment = Fd Torque = Fd Couple mean two forces have same magnitude but opposite direction. What is the relationship among them?

About three years ago or so, I came to this site complaining that for the life of me, I couldn't pass calculus 1. I just couldn't grasp it. I thought I was bad at math, couldn't do it, and was destined for something far less. Fast forward to now and I am about to graduate with a double major in...

*The title for this question is incorrect. I messed it up with another question. My apologies. Homework Statement Replace the system of two forces and one couple shown in Prob. 2/158 by a wrench. Determine the magnitude of the moment M of the wrench, the magnitude of the force R of the...

Hi all, I'm in a modern physics course and am surprised by how confused I am about special relativity. I know multilinear algebra quite well, and so I thought it would be pretty easy, but I'm having some conceptual difficulties. Any help would be greatly appreciated! 1. Why is a special...

A Circular bar 1m long and of 8mm diameter is rigidly clamped at one end in a vertical position. A couple of magnitude of 2.5Nm is applied at the other end. As a result, a mirror fixed at this end deflects a spot of light by 15cm on a scale 1m away. Calculate the rigidity modulus of the bar...

Homework Statement Replace the force-couple system at point O by a single force. Specify the coordinate yA of the point on the y-axis through which the line of action of this resultant force passes. Homework Equations The Attempt at a Solution I'm not sure how to start this...

Homework Statement The problem and its solution are attached as TheProblemAndSolution.jpg. Homework Equations Vector addition. Cross product. The Attempt at a Solution Given that I am just supposed to take Fig. 1 for what it is based on the way the problem is phrased, my biggest...

Homework Statement The first one seems too easy and I'm not sure I did it right (it looks like they are nearly asking what they gave in different words.) I'm relatively comfortable about what I did in the second, note that we did not cover probabilities of intersections of sets yet so I...

With this coming semester I have some interesting options for my schedule. The following 3 classes can be interchanged within my schedule: Data Structures - Studies data abstractions (e.g., stacks, queues, lists, trees) and their representation techniques (e.g., linking, arrays). Introduces...

This is my second year of college, but my first year of EE (just decided that was the major I wanted.) In addition to a gen ed class (american government) and math classes (calc 1, and stats 1) I have a couple of EE classes, but I have no idea what to expect. I was hoping maybe some of you...

Homework Statement A satellite is to be placed in orbit about the Earth at an altitude of 1.6 x 10 6m. What will be its period of motion? The answer is 7.2x 103s 2. The attempt at a solution Using kelper's third law. R3 / T2 = R3 / T2 Radius of satellite: 6.38 x 106 + 1.6 x 106...

Hi everyone, I'm a counselor at a boy scout camp and we're looking at adding the Nuclear Science Merit Badge to our program. I had a couple questions about it for someone more knowledgeable than myself so hopefully someone here can help! -Two requirements involve the construction of a cloud...

Hi all, I have a couple of noob questions regarding the Higgs Boson (HB) and it's recent "discovery" 1. if the HB is so heavy (I understood it is heavier than a proton) and permeates the universe, why is it so difficult to detect it or produce it ? 2. Why do we have to collide protons...

The Higgs is supposed to couple to fermions but not photons. Nevertheless, photons add mass to systems in SR. Also kinetic energy (KE) of fermion motion adds inertia and mass to systems in SR theory. So, how does the Higgs field "tell" that this type of mass from photons and KE IS mass, and give...

So I understand the equation f=g*m1m2/d^2 and I understand how to use it, but I'm unsure what my results actually mean. Once I have calculated the force, I don't know what the strength implies. How much force do I need for one object to orbit another? How much is so much that the objects become...

1. For which following condition, will the cross product of two vectors be zero? a. If the angle between them is 90°. b. If the angle between them is 0°. c. If the angle between them is 45°. d. If the vectors have the same magnitude. 2. If a = (5, 2) and b = (-3, 1), then which of the...

Here's a story: A guy went through all the usual drama in elementary school and high school, and then went to college. He dropped out after a month because he had not a clue what he wanted to do, and since then he has pretty much been sitting in his room doing his own thing. He's starting...

Okay. A few questions. Is there an escape character similar to '%s' which uses an NSString instead of a C-style string, so I could do something like NSLog(@"Hello, %N!",/*Insert NSString* here*/)? I tried the following code: #import <Foundation/Foundation.h> @interface Greeter ...

1. How common is schizophrenia among children (e.g. 10-15 year old or even younger)? 2. Does schizophrenia has any cure? Is there any instance of a person being fully cured of it? Thanks in advance!

Does a moment have any real (physical) significance or is it just a definition/ an aid to understand and calculate a couple. Is it that the rotation is actually caused by a couple! I know we can resolve a force causing a moment about a point into a couple and an equal force acting at that...

Hey guys, I have a test tomorrow in physics and although I'm a good student, physics is getting tougher this year (high school 1st year for me) and our teacher is really bad, her teaching skills are very poor. Plus, I've been absent for a couple of days when we had physics and I can't solve the...

1. Find all solutions x (with 0 ≤ x ≤ 96) to the congruence 13x^385 + 73x^304 + x^290 + 10x^193 + 24x^112 + 70x + 76 ≡ 0 (mod 97) I was able to reduce, using Fermat's Little Theorem, to get 97x^16 + x^2 + 93x + 76 ≡ 0 (mod 97), but I don't know how to proceed from there. Is there another trick...

Hi! I've been searching the web trying to find out the average GPA's of undergraduates in physics who were accepted to Princeton, Caltech, Chicago, MIT, Cornell, etc... with no luck. Could someone enlighten me as to the approximate tiers of difficulty and the corresponding ~GPA's? On...