Load Definition and 1000 Threads

Homework Statement It appears to me that output load voltages in a Bridge Rectifier circuit with capacitor always seem to be greater than that without a capacitor. I'm aware that the function of the capacitors connected across output in rectifiers is to remove pulsation of the DC output, so...

Hi So the problem I have is I want to get the equation of motion of a vibrating beam under a nonlinear "Point" force. The equation would be like this for a distributed load (Which is not the case) But I want the load to be at a point at x=L So I have to options. Add an impulse dirac function...

Hi, I have developed a 2KW hydro turbine prototype with a generator connected. Generator Type - Brushless DC Permanent Magnet (16Pol-18Slot) (2000Watts, 2000 RPM, 54VDC) Generator test report (by manufacturer) is given below; RPM Volts Current 1000 29.8...

Homework Statement In Euler's theory , it's stated that the critical stress of beam is always larger than the yield stress of beam ...I don't really undertstand the differnce between them . Critical stress is defined as the stress that the mximum stress applied before the beam starts to...

Homework Statement You are asked to consult for a business where clients bring in jobs each day for processing. Each job has a processing time ti that is known when the job arrives. The company has a set of ten machines, and each job can be processed on any of these ten machines. At...

Why we must install capacitor in parallel to inductive load? Why not install it in series?

Homework Statement I have designed a bracket and am interested in stress at a certain point. I have figured out the load needed to support. The area of interest carries an eccentric load so bending moment and axial load need to be figured out. Not sure which FBD is correct to use. Homework...

I am studying ALFC and I have a few questions about it. Consider the flyball governor in this system. It senses the changes in speed of the turbine. If load is increased, the balls will slow down and will move inwards, moving point B upwards. Now, this will open some additional valves to allow...

I have been thinking of this and can not seem to understand why nonlinear loads can be tought of harmonic current sources injecting current back into the grid? For example if you connect a passive filter in parallel to attenuate the 5th harmonic, the 5th harmonic would flow between the filter...

Hello everyone, I am having an issue where the output of the op amp for the following circuit works fine under no load and allows me stable output voltage. When I close the switch and apply the load, the output voltage decreases (as one would expect), however, the op amp output doesn't...

What would the torque on a driveshaft be for a 8 ton vehicle in park on a 16% grade? Tire radius is 19". Axle ratio it 7.1.

Hello PF, I am trying to analyze a a beam, connected to another beam at one side at multiple locations (bad quality drawing below). The top side of the beam extends further and sit on another beam, while the shorter lower side is directly connected to another beam. They are all bolted...

Homework Statement can someone please help and explain to me how to do this problem? all the data is in the picture above. Homework Equations i am not entirely sure which equations i should use. i know one possible equation is T=((T_o)^(2)+(wy)^(2))^(1/2) The Attempt at a Solution with the...

Homework Statement Homework Equations S= 3VaIa* The Attempt at a Solution After transformation: Ia = 120<0 / (6+8j) = 12<-53.13 A Total complex power = 3 * Va * Ia* = 3*120<0 * 12<53.13 = 2592W + j3456 VAR This is the power supplied from source. What would be the power consumed by load?

Homework Statement A balanced 3 phase supply of VRMS = 6599.1V is applied to a balanced Y-connected 3-phase load consisting of three identical impedances Z = 50<37°. Take the phase-to-neutral voltage Van as the reference. Calculate: A)Phase voltages Van, Vbn, Vcn B)Phase currents Ian, Ibn, Icn...

Homework Statement The power consumed by 2 3-phase parallel loads are: Load 1: 12 kVA with power factor 0.7 lagging Load 2: 8 kW with power factor 0.8 lagging A)Find the complex power consumed by Load 1 and Load 2. B)Find the total complex power consumed by these two loads C)Determine the...

I am tying to find out how much weight I can support with a piece of plate steel (A514) that is supported only on the three edges. The open span would be 30" wide 36" long and .500" thick. I need to know what the maximum amount of weight I can support with .250" or less deflection. Can anyone...

I have a structure that can have 3 or more supports. It will carry an evenly distributed load with overhang. I thought I would tackle 3 supports first and solve with superposition but am getting the center support reaction to be very low and will go negative as I move the outside supports...

Homework Statement A truck with a heavy load has a total mass of 5100 kg. It is climbing a 15∘ incline at a steady 15 m/s when, unfortunately, the poorly secured load falls off! Immediately after losing the load, the truck begins to accelerate at 1.5 m/s2. What was the mass of the load? Ignore...

Homework Statement Determining the best resistance for my simple circuit consisting of a diode, battery, and resistor. Doing this using Load- Line Analysis Homework Equations ID = VD - V / R - Given by KVL[/B] (I can disregard n-pretend ) The Attempt at a Solution [/B] Here I have...

Homework Statement The whole image is at here http://imgur.com/a/Dcbvv , but I will try to elaborate more. I have a 12V fixed source with an RS of 220 Ohms with a 1N4733 zener diode model connected and a varying load parallel to the diode. Find the Source Current, Z current, Voltage at R1, and...

So I'm studying synchronous machines and what happens when load is increased. In case of alternator(synchronous generator) if the load is increased, like more lamp is added in parallel, then the armature current would increase. But where does this extra current come from? The rotor cannot go...

Hi. I have read some books about control engeneering . In some books, there are some terms which are ambiguous to me. The parts which I can`t understand is that "less mass axis(There are two axis in nanopositioning) frequency response for nomial load is plotted" and "with the maximum payload...

Hi I have a web page with a 400-line WebGL 3D-rendering javascript which also loads a 45K data file of vertices and other data. It also has a lot of math code. I notice it takes a while to load on slower machines (about 5-7 seconds) as a message on the lower left of the screen reports the %...

Last semester I took Physics 2, Calc 3, a lab course, and ODE. This was easy to do for me because I studied often. This semester I will take: 1. Chinese 1 (required) 2. Linear Algebra 3. Modern Physics 4. Physics problem solving (a drill of advanced multi-step calc-based physics problems from...

I have a hollow output shaft gearbox that will accept a 1-1/8" solid shaft, I want to extend the output shaft of a gearbox by 6 inches from the face of output seal to the end of the shaft. The manufacturer states that gear reducer is rated 899 lbs with the hollow shaft or a solid shaft that...

Hi, I am working on a product design which would be used sub sea. It is designed to lift a small load off the sea bed. I have not worked out the exact details yet but the following should be a good start: Load 30Kg Depth 30m I plan on using an air bag of some description - the bag needs to...

Hi Could anybody guide me to a software that can be used to design a non linear spring from load deflection characteristics. need it for both extension and compression spring. thanks noor

Homework Statement I am trying to calculate the power of Rload in the circuit attached (SEE ATTACHED CIRCUIT). The coupler I am trying to model is the Agilent 778D. Can someone verify that I calculate this out correctly? Homework Equations y dB = 10 * log10(x) V = i * R P = v * i The Attempt...

Homework Statement If a question gives us a max load with different extensions, how do I calculate the strain? For example: 1900KN=x mm 1900KN=x mm 2000KN=x mm 2000KN=x mm 2000KN=x mm 1900KN=x mm 1900KN=x mm Homework Equations strain= ΔL / L The Attempt at a Solution What I think is...

Hello Everyone! I was asked to calculate what is the wind speed that can flip a traffic barrel, which picture I'm attaching. It's composed of a barrel (red) and base (grey), which is filled with 14 liters of water. The picture only resembles the shape. The dimensions are these Barrel: Height...

Homework Statement in the 3rd photo , i m having problem finding the critical load Homework EquationsThe Attempt at a Solution to find the critical load , we should use the maximum stress multiply by the area which is 5500(250MPa) , am i right ? why the author used 59.4MPa(5500) ? is it wrong ?

Consider a steel rod of diameter 'd'. If the same rod is broken up into strands and arranged parallel to one another so as to form a new rod of the same diameter 'd' ,Which will have a higher load bearing capacity?. Instead of being arranged parallel , If they are made into a rope of similar...

Hi there. Could somebody please explain to me why this circuit is referred to as 'common source amplifier with active load'? From my understanding a load would be something external that is attached between the output and the ground terminals. For example a resistor attached to a voltage source...

I'm a bit rusty on partial uniform loading on a pin. I want to find the minimum diameter a cold rolled steel pin has to be using a factor of safety of 2 with a loading of 25000 lbs. The pin in the picture is welded between two plates (the right plate bends in and is welded to the left plate...

Hiz lets assum we have a load fixed on the roter of a the 'DC series motor' in the attached photo, where: Vt: DC source voltage (constant) Lf: field's inductive resistance (will be neglected) Rf: field's resistant Ra: Armature resistance Ia= Armature current, If: field current M: back emf (Ea)...

Homework Statement at R2 , is the moment wrong ? it should be 6R1 -200(2)(1) =1800 , am i right ? Homework EquationsThe Attempt at a Solution it's 200(2)(1) because the uniformly distributed load is from 2m away from R2 , so force should be 200(2) ??

Homework Statement I am currently doing an internship and as part of my assignemnt I have to calculate the dynamic load on the bearing of a certain part that is rotating about a fixed point. https://www.physicsforums.com/attachments/chute-png.103400/ This is the part that moves ( the brown...

Homework Statement For region 8<x<12 , why there's an extra (60-30y +3.75y^2 ) - (30y-7.5y^2) ? How to get that? I have no idea at all... Homework EquationsThe Attempt at a Solution here's my working, i have divided the triangle into three parts, i gt 129-80 -75- (60-30y=3.75y^2) -...

Homework Statement why the force of distributed act upward? Homework EquationsThe Attempt at a Solution why shouldn't it act downward due to gravity pull?

Hi. This is a problem from an electronics textbook: The output voltage of a voltage amplifier has been found to decrease by 20% when a load resistance of 1 k is connected. What is the value of the amplifier output resistance? How is there an output voltage without there being a load? 80%...

A synchronous generator is connected to the grid through a reactane of j0.65 pu. The grid voltage is 1 pu and the generator is feeding 0.7+j0.6 pu power to the grid. After some calculations, the generated emf is found to be 1.46 ∠18.12° pu. If the active power is increased such that new complex...

I'm trying to determine the amount of load (power loss) a theoretical engine will suffer from an AC alternator, such as one you would find on an automobile engine, they produce something of 40 amps with 110 volts I believe? To be specific, I'm curious to know how much a theoretical engine would...

Homework Statement why the center of moment due to distributed load 1.11x is located x /3 from the 15kN , shouldn't it be located 2x / 3 from the 15kN end ? Homework EquationsThe Attempt at a Solution is the author wrong ? [/B]

Hi, I have developed a hydro turbine (reaction type) I am testing the turbine for 3 bar input pressure (30 meter head). The turbine diameter is 30 inches. Torque produced is 109 Nm with 600 RPM without the generator (no load). As per Torque and RPM, power available at shaft (without generator)...

Hi Folks: This is my first post, I hope that I observing the proper etiquette. If I have a magnet with a known pull strength is there a way for me to determine the affect of 1/4 inch plywood on the magnets pull strength when the plywood is placed between the magnet and the surface metal? Thank...

I currently need to show that the attached locking pin assembly will not shear or deform under load (total load is 53.5kn, shared over four of these pins) Could anyone advise on how to model this as a beam? Cantilever? What calculations can I use to prove the pins will not shear or deform to a...

The door is 4.5 lbs evenly distributed. Width is 7" and length is 19". The door is mounted by using a friction hinge at the center . How to calculate the total load acting on the hinge? What is the maximum load bearing capacity of the hinge? Length of hinge is 3.2" and diameter of pin is .230...

I am currently in the first year of a 2 year diploma program for mining. It's a full time program with about 8-9 courses per semester which comes out to around 29-31 credit hours. I felt I struggled quite a bit getting through the first two semesters I got two C's last semester and I felt I did...

Had an argument with a few guys at the gym today. I told them that loading a barbell with 100 on each side instead of 2 45s and a 10 causes more pressure on your spine. This example is in reference to someone performing a low bar squat in which the bar has contact points across the entire back...