Load Definition and 1000 Threads

Calculating wind load is windspeed x itself x.00431 x sq. ft. of area. A 100 sq.ft vertical wing in a five mph wind is 10.77 lbs. The mass of salt water is around 854 times that of air. Can you use the wind formula and multiply by 854? Also, does this change with the weight of water at different...

I am going to start my sophomore year of college this fall. I will be 17 years old (just for reference purposes), and the state pays for me to go to college early given I stay within 18 credits per quarter, but I'm wondering if I'm going to be overloaded? My dad is a veteran electrical...

Can anyone please help me with a question re the minimum size square steel pipe needed to bear a load. I loved physics but never took mechanical engineering. I am rigging a winch to one end of a pipe to lift a static load (holding up a gangway temporarily to repair). The gangway weighs around...

I have a 3 phase 3 pole inductive motor with a VFD that is tripping the breker even before it ramps up. The breaker is set to allow its inrush current without tripping. There is about 400 feet of wire between this motor and its busbar. After a load filter was installed for this motor...

http://imgur.com/vheez.gif" Stress = N (normal force) / Area I really need to know what force is acting on the piston rod. TIA

HI everyone! Where and how can i selet a tire that holds a given load ,let´s say 32 tonnes. Thanks.

Ok, so here's my scenario/question. I am a technician that works on generators and does load bank testing on them. I'm having a debate with my boss about power factor and IF I'm wrong--I would like to understand why. Today I load banked a generator that was rated at 25kVA and could run...

Homework Statement Find the allowable axial compressive load for a 3in by 2in by .25in 17 S-T aluminum-alloy angle 43in long. It acts as a pin-ended column. Assume: Factor of safety = 2.5 Least radius of gyration, r = .43 Area = 1.19 in^2 Homework Equations 17 S-T gives modulus of...

Hi, I am using Sensored BLDC motors for some robotic movements. I am driving my motors using motor drivers. I am using ball screw mechanism for lifting a pedal up and down. On the pedal, there will be always a very high load, placed on it. Now, my motor can lift up the pedal with my desired...

Hi, Below is a very simple answer as to what happens to a beam when it has a load applied. "When a load is applied to a beam, delfection occours. If not much deflection, then object is stiff. Linear relationship." How could i further explain this, or is this simple enough?

hi... i need help regarding applying a load that is not parallel(It's like an inverted u shape object applying load but due to it's non parallelity the load that is applied on the object is non uniform) the difference is 1mm between one arm and the other of the inverted u object

Homework Statement Determine the equation for the deflection curve for the cantilever supported at A with a load given by: q=q0*sin(\pix/L). Homework Equations The Attempt at a Solution I think this is pretty straightforward, but want to be sure. I did a similar problem with a...

hello everyone.i'm a disabled; by a surprise stroke at 49 forcibly retired54 year old guy who has been able to figure out or understand almost everything related to home construction in my 25 years as home owner having built on 640 sq ft single handedly from the ground up to...

Homework Statement Problem is this. I am tasked with deriving a formula or equations that I can then input into an excel format. I am to take an equipment base that has four sides with supports at each of the four corners. I am to find the load that each one will hold base upon the Center of...

Hello all! I am a student of electrical & electronic engineering, in my final year; for my dissertation, I am exploring the possibility of scavenging energy from a magnetic field in order to power a wireless sensor..I am using a coil of rectangular cross section with a magnetic core occupying...

Hello! Not sure whether it's a right place to post. My question is from a field of electric drives. I can't figure out how to choose an induction motor for a certain load. Load is a simple cylindric flywheel fitted directly on a rotor. Flywheel has a known mass and dimensions. I know...

Homework Statement A wheelbarrow is holding a mass of 15kg, 35cm from the handle. The fulcrum is located 65cm from the handle. What is the mechanical advantage at the handle? Handle Load Fulcrum _______________============_...

Does anybody know of an equation or rule of thumb for power decrease as load increases? As an example an electric golf cart will go say 15mph with one 100lb driver. Put 4, 200lb people in it and it will go much slower, say 9mph. Is there a way to determine what that loss will be other than...

Hello, First time post long time lurker! I've got an interesting project I am working on which involves a few MechE subjects. The overall goal (for now) is to determine the drag force of a cylindrical cone headed object in sand under various pressures. The movement of the cylinder is the tricky...

"the average load current,I(dc)" and "the rms load current,I(rms)"? What is the different between "the average load current,I(dc)" and "the rms load current,I(rms)"? I am very confuse with rms and dc >.< same with V(dc) ,V(rms),P(rms), P(dc) ... Help TT

I'm currently writing a vehicle simulator and have constructed a chassis out of physical node bodies that are connected as in the screenshot below. I am trying to work out the normal force at each of the green circles such that if it were suspended by each of the four nodes, the summation of the...

I know that stiffness is load per unit deflection. I have the load versus deflection curve for a steel plate. Is it possible for me to find the stiffness of the plate? Thank you.

Hi I have a question to do with using PWM If for example I had a 1ohm load and a voltage supply of 4JC-1, I would get a power draw of 16JS-1, now if I had a duty cycle of say 50% I should get an average power output of 8JS-1. However if i thought of it as having an average current of 2CS-1 and...

I'm having trouble with Thevenin models, specifically this question where the V_oc is not given. The problem: Assume an unknown circuit provides the specified current through the load resistors as given below: 100k - 2.3mA 1.2M - 510uA Find a Thevenin model for the unknown circuit. All...

can compressed air be used to lift a load of 400lbs about 30 feet into the air i came up with using an air compressor to route compressed air into 4 small rocket nozzles to lift it off the ground how powerful of an air compressor would i need if i wanted a constant thrust of 500lbs coming...

Homework Statement A ski pole is bent(plastic deformation) in three point bending by applying a load 2F perpendicularly to the ski pole. The forces at the end points are of magnitude F. If the pole yields due to plastic deformation at the mid point longitudinal span of the ski pole which is...

the question is:- calculate the resultant increase in lenth of a 5m long roof tie rod made of 25mm diameter steel when subject to a tensile load of 80 KN. (assume E=210KM/mm2) does anybody know how to solve this or what the calculation is that i got to use? help apprecited thanks in advance!

I have a college HNC engineering question which I am having problems with, I am OK with calculating the I values, and deflection (if needed). But am wondering on what formulae are required and how to use them, to calculate the maximum loading mass in Kg for a cantilevered beam. The question...

I have a problem of bearing failure. A motor drives a shaft thro a flat belt. This shaft is connected to a load of around 40 kw. The shaft has 1309 self aligning ball bearing as floating bearing at the back end of shaft. On the load side there is a bearing 2209 NUP. The bearing inners are locked...

G'day I was wondering if anyone could give me some information to do with the max load a given beam can support. I have done some study in statics but it was along time ago. I am considering a 6 metre distance, spanned by a rectangular timber beam. I was wondering what information other...

Can anyone tell me that if centre of mass and load centre of gravity of a heavy vehicle doesn't concide,what vl be its effect on vehicles acceleration?

Homework Statement A continuous and aligned glass reinforced composite consists of 40 volume % of glass fibers, having modulus of elasticity = 10 X 10^6 psi and 60 volume % of polyester resin that when hardened, displays a modulus of elasticity = 5 X 10^5 psi. a) compute modulus of elasticity...

I experimented column buckling analysis with different two load conditions in MSC.Nastran. In the first condition, force was loaded from the downward direction at the top of the column. In the second case, force was inflicted toward horizontal direction. But P[critical] of two cases...

Hi, I have a problem with the experimental buckling load that I have deduced for a compressive axial load applied to a tube of circular cross section. The buckling load is 2.34% larger than the theoretical buckling load! The beam is connected to supports via knife edges; these are rigid bodies...

Homework Statement What Voltage is delivered to a 120-volt/5000-watt load which is fed with #10 AWG wire (1.24 ohms/1000') and located 750 feet from the 120-volt source? Homework Equations Ohm's Law E= I * R E=(K*I*2*L)/Acmil The Attempt at a Solution I am in an...

Homework Statement A simple beam is under a distributed load q=c*sine(n*pi*x/L)? if there are two pivots at the end points supporting it, what will be the reactionary force on each one of them? Here, L is the length of the beam and x=0 is the leftmost point. 0\leqx\leqL The figure...

I'm looking for some help to verify a calcualtion that was made by a previous employee. The calcualtion was for load inetria (reflected to the motor). The motor will be driving (3) rollers at a gear ratio of 3.5:1 (motor turns 3.5 revolutions for every 1 revolution of the rolls). I have a...

Homework Statement Why does the voltage regulation of a transformer become negative when a capacitive load is attached? It causes the voltage across the secondary winding to increases rather than decrease, as would be the case for a resistive load. But why? Homework Equations Regulation =...

Urgent! Definition needed for "radiation load" Hi, not really a typical problem, but I have no idea what "radiation load" means and I can't find a definition anywhere. Any help would be great. Thanks!

Hi everyone Suppose I have an n bus system with some initial conditions and a load flow analysis is carried out, which furnishes complex voltages and powers. Now, I need to find the line flows, i.e. the power flowing over every transmission line. If I consider a transmission line from bus...

Hi, I have an FEA model where all my parts are bonded contacts (no contact surfaces). I am trying to fix one end of this model and apply inertial load on the other. However the heavy parts are penetrating into the soft ones. How do I avoid this model penetration? Thanks,

Hi all: I am fresh to engineering and have basic question. I have a 100 inch length and 40 inch wide & 6 in depth plate , it has honeycomb structure what I mean 0.125 inch face sheet of aluminum on either side and rest (6-.125*2)is honeycomb made of alumnium.It is supportted on 4...

Hello, So I have put into motion a plan to build an LED array that scrolls letters. I've got the hardware and coded the assembly to make it happen but I have not yet purchased things such as the LED's themselves or op-amps to drive them. I have calculated that the load will be around 3-4A...

hi... i would like to know the fact of UPS(uninterruptible power supply) that why sometimes UPS has some problem to satisfy the load and how to recover the problem...

Since I'm new to this site don't razz me to bad since I suck at any type of mathematical equations. Anyways, I am building a "Jib" arm and was planning on putting an I beam in the ground with concrete. Although the I beam will have to be free standing and about 10' tall. The "jib" arm...

Hi Guys I hope you can help. I’m currently trying to modify some existing equipment and have a problem that I hope you good people can help me solve. I have a fabricated bracket that currently supports another bracket than runs on linear bearings to position its self. see attached JPG for...

Hi, What is Proof load of a bolt? I need to calculate the proof load of a bolt? I have searched the net but could not find it. Please help me. Thanks, Ana

I have to pulse 80 Amps @ 1 KHz into a capacitive load of a few uF. Unfortunately the RC constant is high enough that it prevents the next pulse to start from 0 amps. So in a sense the pulse generator delivers about 70 to 80 amps per cycle instead of 0 to 80 amps like it would in a...

"C" hook maximum load. Hi, It´s been quite a while since the last time that I had to solve a classic statics load problem (about 20 years ago). Here is my problem: I have a simple "C" type hook (please refer to attachment "Gancho.jpg") made of 25.4 (1 inch) diameter commercial steel...

Homework Statement Problem is (to be solved in software, this is actually a programming assignment): -\triangle u = f on \Omega = (0,1)^2 u = 0 on \delta\Omega And f = 2x(1-x)+2y(1-y) And the exact solution known to be u(x,y) = x(1-x)y(1-y) Okay, so the actual assignment is about...