Couple Definition and 423 Threads

Homework Statement I have solved for the eigenfrequencies of a system composed of two particles of masses m connected to each other by a spring of constant 2k and where one particle is connected to a wall by a spring of constant 4k and the other particle is connected to a second wall by a...

This is for REU and other summer research programs. 1) If the program requires letters to be mailed in, should you go out and prepare the envelopes and buy stamps for the professor? In high school they had us do this but I'm unsure of how it works in college. 2) What would be a nice way of...

Please teach me about this: Why the annihilation between particles must be particle and coresponding anti particle.Example:electron can annihilate positron create a virtual photon,after that,virtual photon create a couple muyon and antimuyon.But why can't be there exist the annihilation between...

Hi there i kinda got stuck on a couple of questions in my course book and don't understand how i am supposed to do i guess i'll focus on the first one now and post the second later Alexander is running around with his kite, the string is 25m long and the kite weighs 450g a) The string is...

:smile: Hey everyone! I'd love if you could help me on these couple problems. Homework Statement I have attatched a PDF file (don't worry, it will only take you an instant to download - it's just a single page). I'm having problems with numbers 2 and 4. Number two is about reflections about...

Homework Statement If the only forces acting in a system are a couple, will the torque of the couple be the resultant torque of the sytem? Homework Equations The Attempt at a Solution

Hi guys, I have two practice problems with no solutions that i was not able to figure out. If anyone could help I'd appreciate it. Question 1 Homework Statement Find the basis of {(x,y,z) | x + y + 2z = 0} Homework Equations None? The Attempt at a Solution I can find the...

Homework Statement This is not a specific homework question, but it is a coursework question. I am having trouble with determining the direction for the moment of a couple. I understand that with couples in general, there is a force negative and a force positive separated by some...

¿How do modern physicists think about magnetism? Recently, I realized something really cool that made me re-evaluate the way I thought about magnetism. I'm not a physicist, I'm in the early process of becoming one (old cow trying out a whole new career). I had this "fieldy" notion about what...

DOUBT!..pleasez help! What is the use of a Force Couple System??..

Homework Statement [PLAIN]http://img25.imageshack.us/img25/5139/physicsproblem.jpg If F1 = 110 lb and F2 = 300 lb, determine the magnitude and coordinate direction angles of the resultant couple moment. Homework Equations MR = \Sigmar x F, M = Fd The Attempt at a Solution...

can the neutrino mass eigenstate couple to the group of SU(2) doublet?if we intentionally not impose any flavor symmetry on it. \left(\begin{array}{c}\nu_{1}\\e\end{array}\right)

I'm in my first ever Physics class and have a few questions concerning skills involving solving Physics problems. I've been noticing that even though I get the right answers, my work getting there is a mess and unorganized. With that said, I have a hunch that won't fly in the upper level...

So I am considering attempting to build a couple of projects to fill in some time, and I am looking for critiques and help on creating these.. Both deal with spherical metal balls (most likely iron, or maybe even a magnet) and a magnetic field. 1. I would like to make something like a...

I was reading stuff on fictitious forces and encountered a section that said that gravity was a fictitious force. I read a couple of websites but still didn't find a clear enough explanation on why this is true? Also, if gravity is a fictitious force, then doesn't that mean that so long as...

I'm currently looking to major in theoretical physics/astrophysics for my undergraduate studies next year and I have a few questions about it that I'd like cleared up. At the moment, I'm a year 12 Australian high school student and I'm trying to decide exactly where and what I want to study at...

Here are five separate problems. Show that the series 1/3^(ln(n)) converges and that the series 1/2^(ln(n)) diverges. integral (sqrt(x)*e^-sqrt(x)) dx integral (x/(sqrt(x-1)+2)) dx integral (1/(2+sin(x)+cos(x) integral (1-cos(x))^(5/2)) dx There are no other relevant...

I ordered the Intermediate Algebra and Precalculus books for my precal class (half of which is covered in each). Does anyone have experience with these textbooks? Here are the links: http://www.artofproblemsolving.com/Store/viewitem.php?item=interm:algebra...

1. Explain how to find a shortest path between any given pair of vertices, given the length of edges connecting the vertices and the shortest distance between vertices (after doing the shortest-path calculation) So I am given a two matrices, as said one with length of edges connecting and the...

Hi, I have a couple hopefully quick questions about quantum mechanics: For a momentum eigenstate how does the wave function e^{\frac{2 \pi}{h}ixp_{x}} not violate the uncertainty principle? (since both p and x are present in the function) Also, when you rewrite the above as...

Is it necessary that torque can only be caused by a force couple? If not, then can you provide examples?

Sorry if someone already asked these, but I didn't see anything that was the same. A few of my friends are in a film class and we're working on a little indie movie, and the concept of it is a micro black hole is discovered at the edges of our solar system, and we want to make it somewhat...

Hi I can't find a Feynman rule for the coupling of two Z bosons to a photon. Does the Z boson couple to a photon at all?

Hi guys and gals, Stumbled across this forum via google. Quick introduction: I'm not involved in cosmology at all. But I do have a casual interest in it, simply because it inspires me. I'm in my mid 30s, mechanical design engineer, atheist bordering on anti-theist, but that could simply be...

1)A baton twirler throws a spinning baton directly upward. As it goes up and returns to the twirler's hand, the baton turns through 4.42 revolutions. Ignoring air resistance and assuming that the average angular speed of the baton is 1.95 rev/s, determine the height to which the center of the...

To improve my knowledge.. These are not homework questions :) 1. How does 'Trepanning' work and where is it used in the manufacturing industry? 2. What is the need for a 'Lip Relief Angle' in drills? 3. If 15-20 deg helix angle drills are called 'low helix angle' and 35-40 deg are called...

Q1: Two lamps illuminate a screen equally. The first lamp has an intensity of 12.5cd and is 3.0m from the screen. The second lamp is 9.0m from the screen. What is its intensity? I know I need to use P=4*pi*(I), but there is no variable included for distance (d). Another formula given is...

Just a couple quick questions I was wondering about. Also, this is an Introductory E&M class so we don't actually perform the surface integral so knowing \oint\vec{E}d\vec{A}=EA=\frac{q_{enclosed}}{\epsilon_{0}} When using cylindrical symmetry I'm supposed to ignore any flux on the top and...

1. HIPS is a : a)Polystyrene-Polybutadiene blend b)High Impact Polybutadiene Blend c)Polystyrene-Polybutadiene copolymer blended with polystyrene and polybutadiene d)High polystyrene matrix material I'm pretty sure it's not B, and I'm leaning towards C, but I'm not very confident...

Hi all, I have my interviews coming up in a bit to get into the Nuclear Engineering program with the Navy, and on one of the study guides, I was faced with these two simple energy problems, but could not figure them out for the life of me! (I graduated with my B.S. in Chemical Engineering, so I...

Homework Statement If A is a 4x2 matrix, explain why the rows of A must be linearly dependent.Homework Equations The Attempt at a Solution I said that nullility(A)=n-rank(A). This tells you that nullility(A) could be equal to 0,1, or 2. Since there are 4 vectors, at least two of them have to be...

Evaluate and simpfly each integral, specify u and du ∫ e^(x/3) ∫ 6 / sqrt(9x²-5) ∫ cosh(x) / sinh(x) ∫ 4x²cos(2x) ∫ (x³+4x) / (x²-4) ∫ (2^ln(x²)) / (x) from [1,2] and for this one i need to give a simplified symbolic(non decimal) answer on the first one, its simple and its confusing cause...

I have been doing mechanics in college and in the present chapter,two of the concepts that I found rather confusing are principle of transmissibility and resolution of force into couple and force. 1. In resolution of a force,acting,say at a point A on a body,suppose we have to resolve the...

Couple questions regarding Newton: 1) Sort of a historical question...In Newton's time, how did Newton explain the stopping of an object due to friction? I imagine that would have been the first objection to his first law. Could he have said that the Earth's momentum had changed due to the...

1. Is the common ape ancestor common for all the human races? 2. Why don't we see another non-human animal, but very similar to humans-in terms of brain power? For every non-human animal, there exist other species, somewhat similar in terms of appearance or skill set. Did human's advanced...

Homework Statement Compute the limits. If they don't exist, then explain. 1) lim as x approaches 0 [cos(x) - 1] / [sin^2(x) + x^3] 2) lim as x approaches 0 √(x^2 + x^3) / (x + 2x^2)Homework Equations The Attempt at a Solution 1) I replaced the sin^2x in the denominator with 1 - cos^2x and...

1) Why might speaker boxes differ in shape? 2) Why might some speakers be bigger or heavier than others? 3) Why are speaker surfaces made of materials other than regular paper or styrofoam?

Hello again :). here is a very interesting exercise, I attached a picture of the exercise, its a Circle with Forces. Homework Statement Compute the Magnitude and Direction of the Resultant Couple acting on the body Shown: Homework Equations M=F x D The Attempt at a SolutionCan you provide...

#1) A child ties a .25kg rock to the end of a string and whirls it at a constant speed in a horizontal circle of radius 75 cm. What, approximately, is the maximum speed at which the stone may be whirled if the string will break for a tension exceeding 300N? A. 10 m/s B. 13 m/s C. 15...

Homework Statement From the perspective of corrosion...Gold and Copper II are joined together and immersed in a 1Molar HCl solution. What possible half-cell reactions and full cell reactions can occur? Which one is most likely to proceed?Homework Equations Half-cell potentials for Au^{3+} +...

A couple of Integration problems 9dx/(x(x^4 + 8 )) Homework Statement Hi I'm new to this forum. I have a couple of Integration Problems which I am not able to integrate correctly. I will also post my attempt at solving the problem so u guys can see what method i took trying to solve...

1. How can something travel faster than light? 2. You have two identical bars of iron – except that one is a magnet. Without using any piece of apparatus, or any other object, how can you find out which is which? Hope you can help Thankyou :)

(1) 1. Homework Statement Determine the stopping distance for a car with an initial speed of 95km/h and human reaction time of 1.0s, for an acceleration (a) a = -4.0m/s^2 Initial velocity (V1) = 95 km/h = 26.38 m/s Final velocity (V2) = 0 m/s Initial Displacement (Y1) = ? Final Displacement...

1. A swimmer heads directly across a river, swimming at 1.7 m/s relative to the water. She arrives at a point 44 m downstream from the point directly across the river, which is 76 m wide. (a) What is the speed of the river current? 1 m/s (b) What is the swimmer's speed relative to the...

Have you ever been to a movie theater where there are seats that are out of view to the movie? A Regal Cinema near me has a couple of seats that are like that. If you sit in one of them you totally can't see the movie. What were they thinking when they put those seats in?

I really don't need an answer to a question but I'm trying to show there are two ways to find the moment about an axis in a 3-d plane when a force is being applied. I know you draw the "r" vector from the axis to the point of where the force is being applied, but sometimes there are two...

a couple of "Infinite Series" questions... Hi, I'm trying to solve some problems in "Stroud's Engg mathematics"... I'm stuck with these 2 questions: Σ (r=0→∞) (2r) / (r+1)! and Σ (r=0→n) (2r-1) / r(r+1)(r+2) the 1st question converges to 2. My 1st try is divide everything the...

1. Santa loses his footing and slides down a frictionless, snowy roof that is tilted at an angle of 35°. If Santa slides 6 m before reaching the edge, what is his speed as he leaves the roof? 2. 1000 kg weather rocket is launched straight up. The rocket motor provides a constant acceleration...

Homework Statement 1st problem I'm struggling to answer this question using my calculus workbook. Find the point of intersection of the lines: y_{1}=3x+2 3y_{2}=16-x I can solve this question as a simultaneous equation, but, as it is in my calculus question paper believe it to...

1. The area of a circle has a fractional uncertainty of 0.08 (i.e. 8%), what is the fractional uncertainty of it's radius? So i suppose you have to use A = pi(r^2) and rearrange, bit confused though... 2. Square wave has a height of 2.4cm +/- 0.2cm. This signal is applied across a resistor...