Load Definition and 1000 Threads

Hi All I have some old programs that can only run on XP. It is impossible to buy a new XP laptop anymore. I am thinking about buying a new Windows 7 laptop and load the XP into it so it can run the old programs. What do I have to look out when buying a laptop and also When is the XP OS I should...

Dear all, I would like to know from you the solution about this problem (which is not a homework, but a topic of my Master thesis!): I need the strain energy density related to a circle of radius r0 centered in an arbitrary point of a square plate, under the boundary conditions described in...

I'm unsure what the purpose of this is. I have looked it up but can only find some explanations stating "role is to convert the differential current input signal to a single ended voltage signal without the intrinsic 50% losses and to increase extremely the gain." I'm not sure what double...

Hi all. This question has been bugging me for a while now so hopefully you can help. I want to know how an electrical load (such as a motor) maintains its power, like when the voltage drops the current increases. I know all the formulas ( in this case P = V x I ) but want to know how it...

I have a dc motor geared to a diaphragm pump, and all hardware are unchanged. As i increase the supplied voltage, rpm increases, but so does the current (torque). I thought rpm increase would lead to higher back emf, and thus lowers the current. So would the only reason for my increased...

Homework Statement Design a bolted joint to attach a suitable American Standard Steel channel at a 15 degree angle to store the bundle of nominal 8 inch diameter x 30 feet long seamless wrought steel pipe. An identical member 20 feet away supports the other end of the bundle. The bundles may...

Hi all. Do we have a boundary (for classification) as to when a load can be called a point load or a distributed load? Thanks.

Homework Statement I was given all the full load stats of a long transmission line(100km) Vs, Is etec and i need to find the N0-load Vr and Is and no load Power consumed Homework Equations Im not entirely sure how to handle this, i would think, sense there is no load Vr and Vs are the...

hye guys... i need to do some design which need me to use S beam load cell as gravity sensor...anyone have ideas about my project?

Homework Statement 6. A person weighing 900 N is standing on snowshoes. Each snowshoe has an area of 2500 cm2. Find the pressure on the snow. a. 0.18 Pa b. 0.36 Pa c. 1800 Pa d. 3600 Pa Homework Equations P=F/A The Attempt at a Solution I tried doing F/(2*(A))...

This is not a homework question.. just share your thoughts please...

Hi, I am new here. I have some problems with the engine motor. What is the difference between starting torque (or locked up torque) and stall torque? What happen if motor torque = load torque? Will the mass move up with constant speed or stay stanionary? motor torque = stall torque = load...

Why does a crystal oscillator need load capacitors? Is it because there will be some capacitive load across the xtal pins?

Hi physics forum, I'm going to use a transformer to step down 240V AC mains to 24V AC. I remember my physics teacher telling me about matching the load between the power supply and the load. Do I have to worry about this in my case? Regards, Richard

Homework Statement This is not actually a homework problem but a design evaluation problem I have encountered. I am trying to solve for all the loads at the pins and have used WorkingModel to try and give me some quick answers. However, the solutions offered by the software do not make...

Homework Statement This is not actually a homework problem but a design evaluation problem I have encountered. I am trying to solve for all the loads at the pins and have used WorkingModel to try and give me some quick answers. However, the solutions offered by the software do not make...

A steel bar that is 16mm in diameter is resisting a force of 25kN. What is the normal axial stress in the bar(MPa) Since MPa = N sqmm would it be 25kn/(0.016m x 0.016m) Im more after the process on how to get the answer than the answer itself.

Homework Statement Solve power dissipated by RL Find a new values for RL that will receive maximum power solve for the maximum power that can be delivered Homework Equations Nodal analysis mesh analysis superpostion etc.. The Attempt at a Solution Hello guys, I've beein...

Greetings, I’m constructing a machine that involves a linear actuator powered by a 12vdc motor. My linear actuator has a foot that crushes an aluminum soda can until the motor’s torque maxes out and it stalls. The machine is intermittent duty at about 6 seconds of use every 3 minutes. My machine...

Homework Statement I am working with an electronic bathroom scale and now have to find the relationship of the applied load which is mass in kg against the beam surface strain. The maximum load is assumed to be 75 kg. Homework Equations (M/I)(h/2)=Eε A picture of the beam has been...

Hi all, I have a problem with a VSD at work that's been confusing. I am a field service engineer for an oil service company, my line of work is in electric submersible pumps (ESP). The ESP motor is a 3 phase induction motor. Power here is 380V 50 HZ.We were using a VSD for motor control. The...

Homework Statement This is the network. The problem states that a new resistor is put between A and B, in parallel with R4. I should find the ideal resistance for this load resistor and show that this is indeed the ideal resistance for maximum power output. Homework Equations...

On My Knees Need Help! to transport a load of 1kg up a ramp. Homework Statement Your group are required to design a transporter, A, which will be required to transport a load of 1kg up a ramp. The dimension of the ramp is shown in the figure below. The requirement of the transporter are: 1...

Can someone explain to me why the torque due to tension is taking from the roller instead of at the end of the beam. If you were to take it from the end of the beam you would also need to take the torque created by the bending of the cable. This is obviously more complicated. It just...

Homework Statement The problem statement is attached to the image. Homework Equations ƩFx = 0 ƩFy = 0 ƩMa = 0. The Attempt at a Solution So I summed the forces in both x&y and found the resultant force to be = -48i -36j [N]. I summed to moments and got -308N*m, but I am not sure...

Homework Statement A screw jack that is used on cars whenever tyres are changed by the owner. The screw moves though a distance equal to its pitch whenever the effort lever ( jack handle) is given a complete turn. If the length of the jack handle is 24cm, the pitch is 2mm and the jack is...

I've got a situation where I'll be placing a load (a vacuum pump) on two separate beams. Basically, the pump attaches to a machine with a bolted flange. I'm wondering what would happen if we removed all the bolts except for the top and bottom one and let the pump hang...what the bending...

Hey guys! I'm brand new to the forum and getting back into electromagnetics again. I had a question on one of my homework problems Homework Statement If a wire with a diameter of 0.0254m is carrying a DC current of 1000A, how much power is delivered to the 100ohm resistive load in the loop...

hi, i am a beginner of this forum. i am not really sure how to use this forum actually. i would like to ask, how to find euler buckling load? what is the formula i need to use?

Homework Statement A mild steel beam has a solid square cross section of 100mm and is simply supported by two supports 3m apart. calculate the dead load that can be safely supported when applied to the middle of the beam? Homework Equations The Attempt at a Solution given data...

Easy question Have a 5ft x 5ft x 5ft structure made from 3/8 carbon steel AISI 1018 I think What is the max load this thing can take? What's the formula? Stress=F/A F=Stress*A? Do I use the Modulus of Rigidity? Elasticity? Where can I find these values? thanks

Homework Statement A prismatic bar (with flange on bottom) has length L, diameter d (so A=(pi/4)d^2), and modulus of elasticity E. A spring of stiffness k is installed at the bottom of the bar (on top of flange). A sliding collar of mass m drops from a height h (above the top of the spring)...

I am trying to use a 0-5000 lb load cell with an Arduino. My issue is the 10 bit input on the Arduino. The load cell will actually be pre-loaded to about 3800 lbs. I just need to measure up to a couple hundred pounds difference. The load cell is a standard 4 wire and measures the difference...

Homework Statement Calculate the power transferred when Vi(t) = 50 cos (4π 10t) in the attached figure. Homework Equations P(load) = |V(load rms)||I(load rms)|cos(phase(V)-phase(I)) The solution must be P(load) = 3.82 W. The Attempt at a Solution I've calculated the Thevenin...

Hey there... We are working on one DC motor after it was overhauled. DC Boom Motor 100 KW for Portrek Crane We have performed Servicing, Re varnishing,Commutator skimming undercutting Setting of Brush.and test the motor on no load.Motor was running perfect without sparking. When...

Homework Statement A winch is used to raise a 200 kg load. The maximum power of the winch is 5 kW. Calculate the greatest possible acceleration of the load when its speed is 2 ms^1, and the greatest speed at which the load can be raised. Homework Equations The Attempt at a Solution...

Hi all. A transformer is driven with a square wave pulse. The transformer has three secondary coils all in series, a diode is placed between two of them which is forward biased during the on time. The coils are used to charge a capacitor and limit current. When the transformer is pulsed...

Homework Statement 1. R = 470 ohms. Connect a jumper wire between points A and B. Measure the voltage across the load resistor. Explain why the load voltage with a shorted load is zero using Ohm's law. 2. Remove the jumper wire and open the load resistor. Measure the voltage between the AB...

Hi Guys, I'm having real difficulty trying to understand shear force and bending moment diagrams - both cantilever beams and supported ones like below. I've given it my best shot to solve the reactions at the points and would greatly appreciate any help on how to form the diagram and the...

Homework Statement 1.What is the formula to calculate the bending moment of a beam subjected to UDL? 2.What is the formula to calculate the bending moment of a beam subjected to point load? Homework Equations Bending moment (UDL) = WL^2/8 (Kg-mm or Kg-m) Bending moment (point load) =...

What all the parameters to be calculated to find a vertical standing beam subjected to axial loading stands without buckling or stands stable? My HW problem has a theoretical question, a vertical beam is fixed on both ends. Loaded on the top with axial load. Show that with an example...

Here is my timetable: [PLAIN]http://img171.imageshack.us/img171/5438/ubc.png I have 25 hours or classes for my first term and 26 hours for my second term. HOWEVER the biggest problem with this is that I have 5 courses for my first term and 7 for my second. Do you think I can handle 7...

Hello, I was just hoping if someone could explain to me the reason why load transfer occurs on a car during a turn. I understand why this is so for braking/accelerating, but not for cornering. Thanks for the help.

Hi guys, Can someone please tell me how to do load balancing using parallel generators with an avr micro-controller? What should be the approach for load balancing? What would be the basic idea to achieve load balancing? Thankyou.

Basic Load Resistance?? I'm a high school science teacher. I have a lab activity that explains how to measure the current v. voltage characteristics for a solar cell. Finding the load resistance that provides the maximum amount of power generated is also covered. Question: What are the...

i want to generate electricity from piezoelectric load cell by application of load on it, but i don't know which type of cell to use and from where to get it? i want good efficiency, please help me out.

Hi How can I calculate the Coulomb friction load torque of a rolling spear on a surface with a coulomb friction coefficient of 0.1? Other details: Mass: 1Kg Radius: 0.1m Thanks in advance

Hello, for my next year I will be taking the following math courses: first semester: differential equations ( honours version ) "advanced calculus" ( spivak's calculus on manifolds course ) complex analysis algebra ( groups, rings, fields ) second semester: continuing the...

The motor-generator will be used to pull a load up a mountain side/steep incline on a rail system, the load is between 10 and 300 tonnes, its for a gravitational potential energy storage system. Excess electricity pulls the load up the incline, when there is demand for electricity the load is...

Hi everyone, I'm working on load distribution of what to be put on a platform. The platform will be rotated by the wheels placed at the circumference of the platform. The loads that need to be put are the optical components which have mass of 1 ton which will cover 8 m x 8 m area and...