Static Definition and 1000 Threads

Homework Statement In the figure below the charge in the middle is Q = -4.6nC. For what charge q1 will charge q2 be in static equilibrium? q1-----10cm------Q------10cm------q2 I know that the answer is supposed to be 18nC. Homework Equations F=Ke lq1llq2l/r2 The Attempt at a Solution...

Homework Statement A car is traveling at 50 mi / hr on a horizontal highway a. If the coefficient of static friction between the road and tires on a rainy day is 0.100, what is the minimum distance in which the car will stop? b. What is the stopping distance when the surface is dry and μs =...

Homework Statement My problem is getting the SOLVE() function to work correctly. I have used it plenty of times in the past, but when I put in these 4 equations to solve simultaneously, it gives me the wrong answers. My Professor said that TI-89's sometimes have problems when having to solve...

A crate is in a pickup truck traveling horizontally at 15.0 m/s. The trucks apply the brakes for 28.7 m while stopping with uniform acceleration. What is the coefficient of static friction between the crate and the truck bed if the crate does not slide? I know how to solve for the...

Homework Statement http://img848.imageshack.us/img848/5884/screenshot20110425at121.png Uploaded with ImageShack.us Homework Equations Sum Horizontal forces = 0 Sum vertical forces = 0 Sum moments = 0 Sum Horizontal Forces=0 The Attempt at a Solution Dx-Ax+Bx+Cx=0 Dx-Ax+Bx+981 Sum Vertical...

Q: "If a curve with a radius of 85m is properly banked for a car traveling 65km/h, what must be the coefficient of static friction for a car not to skid when traveling at 95km/h?" [PLAIN]http://a4.sphotos.ak.fbcdn.net/hphotos-ak-ash4/215513_1974874979462_1470693940_32310002_1293630_n.jpg...

Hello I do not understand the answer given, i may be thinking too hard? Q: "What is the maximum acceleration a car can undergo if the coefficient of static friction between the tires and the road is 0.90?" A:"The static frictional force is the accelerating force, and so F(friction) =...

Homework Statement how can i show the universe is static and not expanding, how it really is. Homework Equations \OmegaM=... \Omega\Lambda=... The Attempt at a Solution "The expansion history of the universe depends on the amount of matter (gravity), quantified by \OmegaM...

static and total pressure ! hello :) i'm new here and it is the 1st time i post a thread here ... now please correct me if I'm wrong... 1-static pressure is equal to the total pressure if the gas is static (V=0) 2- total pressure is always equal or bigger than the static pressure 3-as...

I'm doing a lab for my technical dynamics class and that lab is to determine the coefficient of static friction between a metal washer and both metal and rubber surfaces. I did the experiment using 3 washers set at different distances from the center of the turntable as instructed, and...

A static magnetic field in a homogeneous, linear, medium with permeability μ0 is given in cartesian coordinates by: B(x, y, z) = B0 tanh (x/L) z where L is a constant. a) Sketch Bz as a function of x/L. b) What current density, j(x,y,z) produced this magnetic field? c) Sketch any...

Homework Statement I have been given two forces and have to calculate the magnitude and direction of the third force that will result in equilibrium. The two forces I have been given are: F1 = 2.156N at 48 degrees F2 = 4.508N at 203 degreesHomework Equations I used both the cosine law (c^2...

Homework Statement A bridge truss extends x = 214 m across a river (Fig. P12.68) where θ = 35°. The structure is free to slide horizontally to permit thermal expansion. The structural components are connected by pin joints, and the masses of the bars are small compared with the mass of a 1270...

I was left bewildered by a question our teacher left us to think about over the next week. He asked us how we can demonstrate static friction doing positive work, using a pen and a sheet of paper. Can anyone tell me how I can do this, and why this is so?

Homework Statement A nonuniform fire escape ladder is 6.0 long when extended to the icy alley below. It is held at the top by a frictionless pivot, and there is negligible frictional force from the icy surface at the bottom. The ladder weighs 250 , and its center of gravity is 2.0 along the...

Homework Statement a) If the co efficent of static friction between a table and a uniform massive rope is Us, what fraction of the rope can hang over the edge of the table without the rope sliding? Homework Equations F=mg The Attempt at a Solution The largest fraction of the...

I think I remember reading somewhere that almost every moment of our lives we are surrounded by thousands of volts of ambient static electricity caused by the movement of air and clouds, it's just that we don't notice it. I may have mixed up my information so I'm just asking for clarification...

Homework Statement A car is traveling at 30m/s around a bend of radius 70m. What coefficient of static friction between the tires and the road is required to ensure the car will not slip? Homework Equations The Attempt at a Solution I know that the centripetal acceleration is...

Homework Statement A 5.0 kg mass is held against a wall with which it has a coefficient of static friction of 0.85. What is the minimum horizontal force required to hold the mass against the wall ? The teacher said answer is 58 N .. i can't get to that answer.. Homework Equations...

Homework Statement The uniform rod in the figure is supported by two strings. The string attached to the wall is horizontal, and the string attached to the ceiling makes an angle of ϕ with respect to the vertical. The rod itself is tilted from the vertical by an angle θ. If ϕ = 29.9°...

http://www.nuenergy.org/pdf/static-electricity-converter.pdf

Sorry this isn't for a particular question, just wondering if anyone knows how to determine degree of static indeterminacy (or degrees of freedom) in an arbritary frame? Any help greatlly appreciated thanks.

when a material becomes charged due to static electricity how come it does not stay charged or how come the atoms of the material do not become ions

When Einstein conceived GR he added the cosmological constant in an attempt to create a static universe model. The problem with this was that it was unstable. I've recently read about static spacetime (static spacetime admits a global, non-vanishing, timelike Killing vector field K which is...

Homework Statement If the coefficient of static friction between an table and a uniform massive rope is [tex]\mu[s] what fraction of the rope can hang over the edge of the table without the rope sliding? b]2. Homework Equations [/b] The Attempt at a Solution Frictional force...

For example for quantized EM field the Hilbert space is made up of photon states which corrrespond to EM waves classically. However what corresponds to static EM field in QFT? It can't live in the Hilbert space of photons because any superposition of photon states will still correspond to a...

Hello, I am preparing a material about static electricity, and it's basically finished. However, I have a question what puzzles me. I hope people in this forum can fill that in. So, the core process is that electrons hate to float in the insulators, so they hang on the surface of those...

I am having trouble with a homework problem assigned by my physics professor. An infinitely long cylinder of radius a and relative dielectric constant Er is immersed in a static electric field E=Eox where x is supposed to denote a unit vector in the x direction. The cylinder is alligned on the...

How is static electricity charge distributed over the human body if skin (1100 - 496,000 ohms) is a good insulator? For example, if one wears rubber-soled shoes and walks around on a rug, the shoes will obtain a negative charge. Then, if one touches a doorknob or some other metal object, a spark...

How exactly would I go about finding the components of h_{ab} of the linear vacuum field equations for the external gravitational field of a static, spherical body situated at x = y = z = 0 for all t? I assumed since x = y = z = 0 for all t all h_{ab},x and ,y and ,z terms vanish from the...

1. A gymnast of weight 720 N is holding himself in the cross position on the high rings. He is quite still. A free-body force diagram for the gymnast shows the two upward pulls of the rings on the hands, each, size 380 N. Calculate the angle between the wires supporting the rings and the...

Static Friction Problem -- Physics I Homework Statement I've attached the problem, in order to avoid any confusion.2. The attempt at a solution I tried to use F=ma for both of the masses, however, I need the acceleration along the x which I'm having diffuclity finding. Either that, or I...

Homework Statement Homework Equations M=fd M= r x F The Attempt at a Solution this question really loses me. I'm not sure what exactly it is asking for, much less how to solve it. I am assuming it want's the force on A and E? I suppose I need to find the moment about each...

Homework Statement An equilateral triangle has sides of 0.11 m. Charges of -8.6, +8.0, and +1.5 µC are located at the corners of the triangle. Find the magnitude of the net electrostatic force exerted on the 1.5-µC charge. Homework Equations kqQ/d^2 The Attempt at a Solution first...

Homework Statement how to find FA, FB, FC, FD in 3D equiblirium static? Homework Equations W1 = 500kg http://www.flickr.com/photos/djaguank/5450648168 distance (see at image) if you can't see the image, please follow this link http://www.flickr.com/photos/djaguank/5450648168...

Homework Statement Three resistors, 21, 43, and 73 , are connected in series, and a 0.55 A current passes through them. What is (a) the equivalent resistance and (b) the potential difference across the three resistors? Homework Equations i tried to use EPE/q by putting the equivalent...

i need to know how to study the static friction coefficent like what happens if it exceeds its limit what happens why the least value of static coefficent is static

Homework Statement What's the max weight, P, you can hang on the hanger's arm, when the hanger arm is attached to a pole with the help of two friction forces at point A and B. http://img543.imageshack.us/img543/8466/maxwqeight.jpg Homework Equations Static friction coeffecient =...

Hey there, i´m dealing with a problem when I´m trying to analyze an arch bridge for approximate stresses in the arch. The normal force is quite easy to get for such structure. The problem I´m running into is the fix-end moment for the arch under both dead load and live load (live load is...

Homework Statement Calculate minimal force P of the brakes during the stopping of the wheel. http://img823.imageshack.us/img823/6017/problemzy.jpg Solution is P=34.3 [N] Homework Equations (Written on scan above) The Attempt at a Solution...

Homework Statement How would static electricity on your clothes or on your body affect an experiment involving charged objects? Homework Equations Coulomb's Law The Attempt at a Solution The static electricity would attract the objects due to the like charges, assuming the objects...

Static electricity in outer space? Somewhere I read that a space vehicle traveling in outer space picks up a static electricity charge. Is this true and if it is true, where does that static electric charge come from?

- a free field has a definite number of photons, which implies that the expectation value of the free field is zero - a static field has a indefinite number of photons (or none at all, rather), but its (classical) field strength can be measured precisely How are free fields and static...

Homework Statement At what distance "d", from point "A", the board with the person will slide whereas http://img267.imageshack.us/img267/6139/skkkkkkk.jpg Uploaded with ImageShack.us Homework Equations Weight of board = 50 [kg] Weight of person = 100[kg] Frictional coefficient...

Okay, me and my friend have been working on this problem for a while and it just been a headache catalyst for us...your help is called upon, people of the internet. Homework Statement A system of weights is in equilibrium. Calculate the distance "s" where WD = 5[N] WF = 5 [N] WE =...

Homework Statement in a demonstration designed to determine the coefficient of friction for a book on a wooden plank, one end of the plank was raised until the book on it began to slide. if sliding commenced when the plank was at an agle of 37 degrees above the horizontal, what was the...

Homework Statement Two workers carry a beam at the length of 3 meters. One worker holds the beam at the edge and carries 0.4 of the beam's weight. At what distance (x) from the other edge holds the second worker? Homework Equations None. The Attempt at a Solution The solution is...

Homework Statement To measure the static friction coefficient between a 1.64-kg block and a vertical wall, the setup shown in the drawing below is used. (The dots are only there because spaces didn't work) ......| ......|W SPRING----->(Block)|A ......|L ......|L ......| A spring (spring...

Homework Statement A charge -q and a charge 4/9q are located at coordinates x = 0 and x = a, respectively. If you place a third charge so that all three are in static equilibrium, justify that its position and its charge,respectively, can only be x=3a Q=-4q Homework Equations...

First of all thanks for a very good forum. Secondly I must admit that physics was never my strong side and is still not. During my high school days I had very much problem with physics simply because I was not really a science person (Had all good grades in other subjects than science). But...