Load Definition and 1000 Threads

why do two diodes in parallel not share the current load?

I'm working on a homework problem for Statics and I'm stuck. Could someone please help?Problem: Draw the internal force (N,V,M) diagrams and include all significant figures Here is all of my work: Resulting F from W1: W(x) = W1 ∴ F2=∫02b W1dx eq (1) ⇒ F2 = W1⋅2b x1 = (F1)-1 ∫02b W1dx =...

Hey all, So in relation to another question I've posted, I need to apply a distributed pressure in Abaqus on a compressor nozzle. Up to now I was just applying a uniform pressure throughout but I'm wondering how I would apply a pressure distribution? Also would it be simpler to just apply the...

Hi, I'm new here so I'm not sure how things work but I'd like some help on a question. How do I go about finding an expression for both i_in(wt) and the average current? This is the inductive rectifier circuit I'm working with. http://i.imgur.com/HaWzFfQ.png http://i.imgur.com/kefMiOd.png...

Homework Statement I have to work out the reactions at A & D. Sketch the shear force diagram for the beam and sketch the bending moment diagram. i have worked out the reactions at A=56kN and D=34kN. I have done the SFD. I am just struggling doing the bending moment diagram and don't know how...

So we are doing a lab in class where you have to calculate coefficient of friction. This picture shows exactly what we are doing except the wooden block is flat There weight on the string. http://facstaff.gpc.edu/~apepper/website pics/friction2.jpg So what does added load (there is no...

Good evening, Can anyone explain me G load? What is that (for now) in simple words? -0.5g? 2.0g? 2.5g? Thanks a lot, TBF

Hello everyone, I have designed a part that should be able to withstand a shear stress of 43 MPa ( give or take). The part will be made of Nickel Aluminum Bronze (CuAl10Ni5Fe4). When I check yield strength values for this material (I'll multiply it by 0.6 to estimate its shear strength), they...

I have a load cell which must be placed onto a piece of vehicle structure. In an ideal world I would attach the load cell to the structure and calibrate both together to ensure a very accurate calibration, and that accurate loads are measured. However a problem arises if I need to replace the...

Hello there guys I'm trying to find out which ball bearings I have to use for a new wheel hub I am designing. What I'm currently doing is a load analysis for the axis but I am confused on how would the forces that affect the wheel (normal, friction, lateral force when the car takes a turn...

can you do load line analysis on a bjt with just a knowledge of algebra or is calculus required?

Good day Geniuses. im building a drone prototype for an agricultural project. approx. weight will be 600 lbs, using my own 8 rotor design. trying to determine rotor size and motor power required to fly such a device at 30 feet. would also be interested to determine an approximate wind speed...

While on a long distance train in India I noticed that there were two huge cars devoted to power generation, one at each end of the train (approx. an 18 car consist). A pic. below. Apparently diesel powered generators. Each car had two exhaust pipes on top (one at each end) so presumably these...

Hello I was trying to calculate the horizontal deflection of the free end of vertical clamped beam. The beam would be loaded at the free end with a horizontal force H and a vertical force P. My idea was to calculate an initial deflection due to the force H. Then calculate the additional...

Hi dears I am doing a random vibration analysis on a reciprocating rotary system and I need to calculate the load that applied to the bearing during the analysis. the picture is attached to post. thanks

Hello all, I have an actuator to lift a table, with certain amount of wait on it. Since I have mounted the actuator in an angle, I had to analyze the load on the actuator. However, the velocity at which I am lifting the table is bare minimum compared to the load on the table. So I had the...

The fuel pressure load equation for an aircraft in a constant roll maneuver has the term (as a result of the roll maneuver): \frac{\dot{\phi^2}}{2g}R^2 where R - radius from center of fuselage g - gravitational constant \dot{\phi} - roll rate my question is where does the "2" next to the...

Hi, If the voltage, full load current and full load output power (kW) of a 3 phase induction motor are known, and the efficiency is assumed to be 90% (is this realistic), am I correct in thinking that the full load power factor can be approximated (due to assumed and not actual efficiency) as...

I am trying to symbolically resolve the angle of rope that suspends a load (rectangle) between two pulleys given the length of rope that is let out over the pulleys. See attached image. the load is not intended to move horizontally, only vertically. so you can imagine each pulley must have an...

Dear Friends, Hi Everyone. I am Planning to Design a Special Engine. I got with an Idea but got Struck on Starting the Design. I do think many has the Same Problem "Starting Trouble". Could someone tell me where to Start the Engine Design? Please...

Ive been given a question which I'm stuck on and cannot answer. I've only been able to calculate the maximum allowable working stress and other then that I am stuck on how to answer the following question: A specimen of the same material that was used in the above test (mild steel), had a cross...

Homework Statement A certain type of concrete has a tensile breaking stress of 3.1 MN/m^2, a compressive breaking stress of 37.7 MN/m^2 and a shear breaking stress of 9.4 MN/m^2. A circular pillar of this concrete has a radius of 0.6 m. What is the maximum load it can support assuming that it...

Hi guys, I was wondering could I get some help with determining the experimental critical buckling load of a pinned ended strut. I am hoping to compare predicted values from Euler buckling and Perry Robertson to experimental values. I have carried out a experiment where by I applied a axial...

For a full wave thyristor controlled rectifier, if the firing occurs at 90°, the average output voltage is zero. Therefore the average output current will be zero also I assume? If considering idealised current waveforms, should all the currents also be zero (thryristors etc.) be zero or...

As far as I know, Compact Fluorescent Lamp (CFL) is an inductive load. I understand that inductive load doesn't allow an immediate change in current. When the circuit was initially open (through open switch) then became close, the inductive load was energized. So opening again the circuit after...

Hi, For a single phase full wave fully controlled bridge rectifier carrying a RL load, how is the RMS voltage and current calculated? I have researched textbooks but can only seem to find RMS equations for Resistive loads and I am not sure whether the negative load voltage will affect the...

Hi, I am trying to model a full wave single phase thyristor controlled rectifier feeding a resistor and capacitor in parallel (like a power supply I believe where the capacitor is used for smoothing?) and I would like to calculate the average output dc voltage in a similar fashion as for a...

I need to make a steel beam ( or aluminum) of square tube ( box beam) 10 feet long with a balance point 2 feet from one end. The short end will have 60 lbs on it and the long end will have 30 lbs. how thick of a wall will the square tube need to be to hold the static load?

I have a wire used for cutting cheese that gets pushed horizontally into the wire repeatably. Naturally the wires break as the wear. Currently, we just tighten the wire until it seems good but I am unsure how much the pretension in the wire influences the rate the wire breaks. I was looking to...

How does AC current "reach" its load? If the electrons/fields/charges are oscillating (reversing direction 50 or 60 times per second) instead of traveling in one direction like DC does, how does current flow and reach the load in a circuit? I have read some articles but couldn't find an answers...

Homework Statement FIGURE 1 shows a 50 Ω load being fed from two voltage sources via their associated reactances. Determine the current i flowing in the load by: Superposition Theorem Homework Equations [/B]The Attempt at a Solution :[/B] see attached files as I can not write in itex and...

Homework Statement 2. A rail car containing 8000 lbs. of a chemical whose density is 3.5 lbs/gallon is to be unloaded into a 2500 gallon capacity tank. Will the tank be able to hold the entire load? Homework EquationsThe Attempt at a Solution volume = mass/density= 8000lb/3.5=2285.71

Is there any issue to connect the Ammeter in the circuit before or after the load. According to me, the current should remain same in circuit and there should be no restriction for Ammeter connection so it can be placed anywhere in the circuit. please explain why as this question asked to me by...

Hi everyone, I have implemented PI control of speed of a PMDC motor under no load condition. I now intend to implement the same with a load added to it. I want to compare the results with simulation as well. Is there any way of adding a known load to a DC motor. In my set up the dc motor is...

Hi I was hoping someone could clear something up for me, I've been set an virtual load (unit load method) question at University, that part of the question I can do however its the calculating the force on the members part that I am struggling with. The question asks for all the forces in the...

Hi Everyone, I am building a hydro turbine, I am expecting it to produce circa 4 kw possibly as high as 7 kw depending on flow. I am on a very limited budget. Please could you suggest possible means of getting load output data? I have considered attaching a heavy truck 24 v alternator and doing...

I am attempting to create a "lever" to lift the front of a 14ft 85lb Kayak up 7ft, then manually slide the Kayak to a rail, and then use the lever to lift the back of the kayak to another 7ft high rail on a truck. I decided to attempt this with PVC sections, creating an "L" the vertical shaft...

I'm trying to work out the free body diagram for a router tool (which is basically used to cut wood sideways and create grooves and interesting shapes). I need to work out the free body diagram in order to find out the bearing load but I'm having difficulty with the aforesaid. The shaft that...

Please take a look at the attached diagram. This is a rough representation of a concept my team and I would like to implement in a project. Initial research suggests that such pin-based weighing systems are strictly unidirectional (i.e the basic clevis pin loan cells). Our platform rotates while...

Homework Statement A 6.0 m bar is supported by a fulcrum at 3.9 m from the left end. There are loads applied to each end of the bar. The load at the left end of the bar is 468 N. What load in Newton should be applied to the right end of the bar to create equilibrium? Homework Equations M=Fd...

Homework Statement I have attached a scanned file of the problem outline, including all known data. For the initial curve, H, (horizontal force) is constant, while for the final curve, H', is a combination of the initial H and the stress added by the point load, P. I run into issues trying to...

I am wondering whether graduate schools really care about final semester course load. I am a senior physics major, applying to graduate schools in geophysics. Currently I am enrolled in the normal 16hr course load but am considering dropping down to 12 hours for my final semester. I've never...

I am working on my graduation design project, and I am responsible for making the power supply circuit. It is a lower power source, and acts like a current source that can supply current in the range of 30 mA to 130 mA. My power supply circuit has a source impedance of 85 ohm. Our load, a...

Hi, I am designing a beam to replace a load bearing wall. I have produced 2 separate UDL diagrams which, one for floor load and one for wall load. I am trying to find shear force and bending moment as in one for the total of the two diagrams. I know how to do it if the loads are spread...

Homework Statement I am trying to analyze the following circuit: "Note that if the two 2N5485s approximately match in their characteristics, not only is the voltage gain unity, but the DC offset is small: the constant current due to Q2 creates a constant voltage drop across R1. Furthermore...

So I recently signed up for classes this semester, and have everything down except one class. This semester, I'm taking modern physics, electricity and magnetism, differential equations, intro to advanced math (essentially an intro to proof class, along with a little basic set theory), and...

What is the difference between the unit dead load and the unit weight of a material? For example, the unit weight for structural concrete is 145lb/ft^3. What would the unit dead load be? 145lb?

Hey everyone, I am not a structural engineer; so I thought maybe I could get some help understanding the concepts of a project I am trying to complete. I am trying to get a rough estimate of a safe load capacity for a "lifting bar" . The material itself is 1" diameter x 36" long 1045 steel...

A roof purlin, supported by a roof rafter must support a 300 lb vertical snow load. Determine the component of of the snow load as a concentrated load “P” both perpendicular and parallel to the axis of the rafter. I read that the perpendicular component of the 300lb force can be figured out by...

What I know is there 2 friction; Air resistance and Weight of rotor? Is load of generator consider as friction? I noticed that when generator's load is half, fuel consumption is reduced (but RPM and frequency is still same). I tried to think how that, although weight of rotor is constant. does...