Static Definition and 1000 Threads

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...

I posted a question about this a couple days ago but I have since solved for the total temperatures in the compressor, burner, and turbine. My question is this. How do I calculate the static pressure in the compressor, burner, and turbine when i know the following data at each station...

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...

hello everybody! i am making a report on Static induction thyristor and about to end the report but i could't find the practical device number of the SITH so if anybody knows about this, kindly tell me?

Static Equilibrium...don't understand something http://img135.imageshack.us/img135/4664/helpo.jpg Look at the equation at "sum of all forces on y axis" and please tell me: How the heck did 0.4Na -mg = 0 turn into Na = 2.5m g?

The equation of motion for q in a static E is given by: d/dt \gamma mv = qE Some textbooks use the above equation in deriving Maxwell's equtions, but is there a way of deriving this equation from elementary assumptions such as Newton's law in q's frame and Coulomb's law? Thanks.

Homework Statement A crate resting on a rough plane is found to be on the verge of sliding when the plane is inclined at an angle of 40 degrees to the horizontal. Calculate the coefficient of static friction between the crate and plane. [ Homework Equations f(s)<_(Mu(s))N <_ is meant to...

"A static universe or "Einstein universe" is one in which space is neither expanding nor contracting." from:http://en.wikipedia.org/wiki/Static_universe Does this mean that such a universe has always existed and has always been the same? Has always been here, unchanged? Because I don't...

Homework Statement http://www.screencast.com/users/trinhn812/folders/Jing/media/d77fab7d-ece6-4c9c-be65-bf41f94770fd Homework Equations I got the right answers doing the work shown, but I don't understand the logic of how I solved question 4. The Attempt at a Solution

Dear Physicists, I am currently thinking of a way of inducing a current in a conducting material by a magnetic field. I am not good at magnetism and electricity at all, but I think it should look like the picture below. By the way, the material in the middle does not move. Does anyone...

Homework Statement mA=5kg , mB =10kg , coeff of friction is same for static and kinetic friction = 0.15 g=10ms-2 2 blocks a , b are in contact with each other resting against a rigid wall on a horizontal surface. There is fricition acting between the blocks and the surface . A force of...

Homework Statement A toy dinosaur floats on water in a container and is partially submerged with 90 % of its volume underwater (submerged). (a) What is the density of the dinosaur? I got this answer right. It is 900 kg/m^3 A layer of oil, with a density of 869 kg/m3, is now...

have a manometer. i want to measure the static pressure for calculation of axial flow fan efficiency. please tell me how would i do it. Regards.

Hi I have posted the picture of the problem. I have already done the problem but I have some questions. Here the trailer is accelerating due to the applied force P. I used an inertial frame of reference at some distance to the left of the car.And then did the torque calculations with...

Homework Statement There is a roller coaster cart with passengers sitting on the top of a 23 degree incline. The ride is about to start. The combined mass of the cart and passengers is 363kg. a) What would the free body diagram look like? b) How do you solve for normal force? c) How do...

one end of a uniform 10 meter long rod weighing 50 Newtons is supported by a cable at an angel of 53 deg with the rod the other end rests against the wall where is is held by a friction us=2 . determine the minimum distance x from the left end of the rod at which a block weighing 20 Newtons can...

Homework Statement A large crate weighing 4520 N rests on four 12-cm-high blocks on a horizontal surface (figure below). The crate is 2.0 m long, 1.2 m high, and 1.2 m deep. You are asked to lift one end of the crate using a long steel pry bar. The fulcrum on the pry bar is 11 cm from the end...

Homework Statement You pull on a crate with a force of 50N at an angle of 25 degrees. The box doesn't move.? What is the coefficient of friction and what is the frictional force? I understand the forces are balanced, but are they balanced in the x and y direction. I've done the problem ...

Homework Statement A 65.0-kg person stands on a horizontal board. The board is 10.0-m long and is NOT perfectly uniform. The person stands 1/4 of the way from the left end of the board. The board is supported at each end by a scale. The scale on the left reads 753 N and the scale on the right...

Homework Statement I have a question about rotational static equilibrium. When we consider the static equilibrium of a system, I realized that most people only consider the net torque acting on the system. Why don't we need to consider the net force acting on the system? For instance: A...

Homework Statement I was asked to find the mass flow rate and static pressure Homework Equations Bernoulli's equation The Attempt at a Solution I simply assumed that the area of the water jet hitting the vane is equals to the total area of water leaving the vane. I'm not sure if my...

I need an assessment on the homework before I submit it. Homework Statement A Ladder of length L and negligible mass leans again a vertical wall, making an angle θ with the horizontal. A work man of mass M climbs the ladder a distance x from the bottom along the length of the ladder...

Homework Statement A uniform ladder of mass m and length l leans at an angle theta against a frictionless wall. If the coefficient of static friction between the ladder and the ground is mu, determine a formula for the minimum angle at which the ladder will not slip. Homework Equations...

Homework Statement A car of mass 1.1 x 103 kg negotiates a level curve at a constant speed of 22 m/s, The curve has a radius of 85 m. Determine the coefficient of static friction that allows the car to make the turn. Homework Equations mv^2/r = uFg and not sure what for static friction...

Homework Statement Please help me do these : [PLAIN]http://broadcastsol.com/321.JPG Prob1 The mechanical system of massless members is shown in the figure. Determine the relationship between two forces P1 and P2 to keep the system in equilibrium at position as showing in the...

Maybe this should be posted in biology but it seems more like an electricity question to me: I've read that static electricity increases in the cold because of lower relative humidity. This seems to mean that it is more difficult for things to dissipate/ground their electric charge to the...