Static Definition and 1000 Threads

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...

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...

Homework Statement [PLAIN]http://broadcastsol.com/123.JPG Prob. 1. The structure of massless members is shown in the figure. Determine the reaction forces at the supports C, and forces in the rod EF and DG. Givens: P, a, b, c. Prob. 2. The structure of massless members is shown...

Hi everyone! I just have a quick question about the theory behind a concept in statics. Problem: I was given a question that states that a sign is attached to a pin joint and also to a spring. The other end of the spring is attached to a spring joint as well. They hang there in static...

a rod of length 4m and weight Fg is supported at one end by a cable attached to a wall that makes an angle of 37 degrees with the rod. an object of equal weight is a distance of xm from the wall. the coefficient of static friction between the wall and the rod is .5 determine the minimum distance...

two people are holding a unifrom beam of length 7.6m and weight 450N. the first person is holding the beam 1 m from the left end the second is holding the beam 2m from the right end determine the force the each person exerts on the beam. choosing the axis as the left most person who exerts...

a uniform beam of length l and mass m is caried by two people one is distance d1 from the left end the other is distance d2 from the right end determine the force each person exerts on the beam. I have yet to encounter a rotational problem such as this with 2 axi

So I've been pondering on this question for quite a while and I'm a little stumped. It's not a homework problem; just a problem I came across yahoo answers a week ago. Basically it's a true or false question: Homework Statement If a highway curve is properly banked and posted at 45 mph, it...

Homework Statement A uniform diving board of mass=27kg and length x=4.3m is supported by two beams. beam A at x=0m and beam B at x=1.1m. A 68kg diver stands at the other side of the board. A. Find force on support A. B. Find force on support B. Homework Equations Net force = 0 Net...

Homework Statement So I have looked at several ladder example problems, (the most basic for statics), but was given a problem by my professor that has me a little stumped. This is day 2 of learning for me and I am caught up, here's the problem: A 30.8 kg beam is attached to a wall with a...

Homework Statement A mass of 0.311kg is attached to one end of a string, and a mass of 0.625kg is handing off the other end. The string goes over a pulley which has friction in its axle. What is the magnitude of frictional torque required to maintain static equilibrium? Homework...

Homework Statement A car traveling on a flat circular track of radius 5m accelerates uniformly from rest with a tangential acceleration of 1.7m/s^2. The car makes it 0.2 of the way around the track before skidding off. Acceleration of gravity=9.8m/s^s. What is the coefficient of static...

Homework Statement The metal pole has a mass of 10kg, and the load has a mass of 50kg. The rope is attached so that it is ¼ of the pole’s length from the free end of the pole. Find the tension in the rope and the force at the hinge. Homework Equations The Attempt at a Solution

A car with a weight of 10,500 N rounds a curve with a radius of 102 m on a level road at 44.0 m/s. The tires are at the point of starting to skid at this speed. a. What is the maximum force of static friction? b. What is the coefficient of static friction between the tires and the road?

Homework Statement Your family just had anew refrigerator delivered. The delivery man has left and you realize that the refrigerator is not quite in the right position, so you plan to move it several centimeters. If the refrigerator has a mass of 180 kg, the coefficient of kinetic friction...

Homework Statement A crate sits unrestrained on the back of a flatbed truck traveling along a straight road at a speed of 80km/hr. The driver applies a constant braking force and comes to a stop in a distance of 22m. What is the minimum coefficient of static friction between the crate and the...

Homework Statement In static equilibrium a spring is stretched 0.25 m by a hanging mass. If the system is initially moved up to the unstretched position and released with zero velocity, determine position of the mass (in m) after 4.2s. Take the equilibrium position to be zero and up the...

Since electrons can never be at rest because they have some non zero temperature, Isn't the static E field that one would perceive in a capacitor just an averaging of all the E fields creates by electrons in motion on either side of the capacitor plates. If this is so, since the electrons...

I have this question that I am working on, I think I know the formula to figure it out, but I am not too sure. I just need some help explaining how to do it, what to figure out first. The rest I can obviously do myself. Thank you so much! A 1450 kg car is towing a trailer of a mass of 454 kg...

Suppose that one has a heavy rigid beam supported by two vertical rods at two different points A and B, and wants to calculate the reaction R_A, R_B made by the rods. I found the reactions first by taking moments with respect to A, and then with respect to B. In both cases I included the...

Homework Statement Two blocks with the same mass m = 1 kg are stationary on two slopes with slope angles of 30 and 45 degrees. Both blocks are connected with the larger one in the middle via two pulleys. Made a sketch to make it clearer...

Homework Statement (rotate picture 90 degree clockwise) A 50 lb weight is supported by a wire attached to a pulley at point B. The Pulley rests on wire ABC. If the tension in wire ABC is equal to 70lb determine the angle \phi necessary to keep point B in balance Homework Equations F=ks...

I was given 2 problems based on statics and I was wondering if anyone could help. Thank you - we just learned the concepts of statics TODAY and were given an assignment immediately, so any help would be appreciated. A window washer attempts to lean a ladder against a frictionless wall...

Homework Statement A 4.00 kg block is pushed along the ceiling with aconstant applied force of 85 N that acts at an angle of 55 degrees with the horizontal. The block accelerates to the right at 6.00 m/s2. Determine the coefficient of kinetic force between the block and cieling Homework...

There is a situation, we have an electric field and a magnetic field, both are static. And we know the density of energy is u=E·D/2+B·H/2, so dU/dt=0, but Poynting vector S=ExH is not zero, which means energy is flowing. This confused me. Static field also has energy flux?

Homework Statement Does contact area of the bottom of a shoe affect the friction coefficient? Also is Static friction affected by mass? Homework Equations The Attempt at a Solution

Homework Statement A baggage handler drops your 7.00 kg suitcase onto a conveyor belt running at 2.30 m/s. The materials are such that µS= 0.410 and µK= 0.250. Homework Equations How far is your suitcase dragged before it is riding smoothly on the belt? The Attempt at a Solution...

Static Equilibrium... Please help Homework Statement The J-shaped member shown in the figure is supported by a cable DE and a single journal bearing with a square shaft at A. Determine the reaction forces and at support A required to keep the system in equilibrium. The cylinder has a weight =...

Static Equilibrium/Torque--Calculating the force required to tip a box Homework Statement A uniform crate with a mass of 13.2 kg rests on a floor with a coefficient of static friction equal to 0.536. The crate is a uniform cube with sides 1.21 m in length. (a) What horizontal force applied...

Homework Statement why should experiemnts related to static charges be carried out on dry days? Homework Equations I know this somehow relates to the moisture in air. yet, I do not understand the concept behind. The Attempt at a Solution Do the sparks...