Member Definition and 250 Threads

The STL containers have a lot of member types, so I assume they must be there for declaring variables of those types. However, I can't discern how exactly it is that I'm supposed to use those member types to declare a variable. For example:map<int, char> t; t::key_type u; // I want this to...

Hi, I have a design using a simple 'inverted v' frame . Each member is 1.22 m long and sees a UDL on it, acting downward(6580 N/m). The angle between the members and the horizontal is 5 degrees. and both footings are bolted firmly to the horizontal. I wish to analyse and confirm that the...

Homework Statement Find stress or force in member AE Homework Equations torque = force x distance The Attempt at a Solution Solution out of book is 142 kN Attempts: Mb = -(200kN)(2.5m) + (.895AE)(5) + 510 = 111 Kn Mc = -(3m)(170kN) + (.895AE)(5) = 114 kN Md...

Hello, Attached is a drawing of a frame. I have already solved for the reactions for the frame. I am now trying to isolate each member to continue the design process. I am having problems finding the reaction forces for "member B" on the attached drawing. Using the three equalibrium...

http://imageshack.us/photo/my-images/855/unledvny.png/ It is saying that member AC and member DC are both two force members. However, isn't there a downward applied force of 600 N acting on both of these two members as well?

Hi, I'm a new member looking for a little help. I'm working on an automotive suspension project where we replace "electronic damping control" struts with a coilover that has no sensor. I'm looking to bypass the sensor and trick the ECU to thinking they are still hooked up. The resistance...

Old Pascal/Delphi programmer here with a question about c. I can kinda make my way around in c/c++ but I'm no expert. I always thought the "struct" data type in c was just a mixed data type similar to "record" in Pascal. Now I find that "struct" in c++ can have member functions and basically...

Homework Statement Determine the forces acting on member ABCD The 100 lb force acts horizontally at point D, the large, bold circle is a wheel, and the smaller, less bold circles indicate pins connecting the members. Member BE is solid. I forgot to label point F in the picture...

hi colleages...is the equation below represent a dynamic equilibrium of vibrated beam-column member and simple boundary conditions? M(x,t)=Q(0,t)*x+integral{q(x,t)-mass*acceleration(x,t)}*(L-x)dx where M(x,t)= dynamic moment. Q(0,t)=shear at x=0. q(x,t)= external dynamic loading...

I have not been able to obtain a NSERC position in Canada, which is the equivalent of a REU in the US. Can I asked for part-time pay? Express my extreme interest in the research field? Promise that my spring marks are above a certain level?

Please refer to the diagram attached. I am trying to work out the peak stress and deflection of a vertical member in a simple steel frame. I know that the vertical member will be subjected to a buckling stress, but I'm unsure as to whether the moment about O caused by the cantilevered...

i am confused on the determination of zero force member from the above pic, the coloured beam is zero member, i know that when u view from joint B, 2 beams are zero member, but when u view from A, beam_AB is not zero, are there any contradiction? also, i don't know why when F_AB is zero...

I find it rather confusing that the vector emerging from the support of B is pulling to where the force is applied to. Can anyone clarify that for me?

Homework Statement hi all, I've got a simple truss question. Which asks to solve for the member forces. I've learned the stuff in class, but from what I see here, I don't know which joint to start with. With the provided image below, can someone please direct me to which joint I should start...

Homework Statement please see the image, I am supposed to find the internal force in each member of the truss and state if its in compression or tension Homework Equations The Attempt at a Solution here is what I have so far (all in kN)... My=40 up Gy=80 up Mx=0 from joint G...

New Member ... small Question Hello every body i want to ask about a useful books that can illustrate flip-flops and counters please who know can get it to me ?? cause i can't study any thing in my faculty and i need to understand flip-flops thanks advanced Loay ^_^

Homework Statement I have a member that is at a 15 degree angle from the horizontal. I have a purely vertical load acting halfway along it, and an applied torque at one end. I am solving for the torque at the other end. Homework Equations Equilibrium equations. The Attempt at a...

You are to design a tension member... You are to design a tension member (square rod) with a cross section to carry a mass of 575 000 kg with a safety factor of 2 against yield and a safety factor of 3 against static fracture (overload). a) What is the design stree that you will use for the...

design a tension member w/ cross section... Homework Statement You are to design a tension member (square rod) with a cross section to carry a mass of 575 000 kg with a safety factor of 2 against yield and a safety factor of 3 against static fracture (overload). a) What is the design...

If I have a beam tilted at an angle with a weight hagning off of one end and it is fixed on the other (see attachment), my teacher says that I need to resolve the force to find the force in the beam. However, it does not make sense to me that the force in the beam increases as the angle...

Hi there, I'm new to the forum. My concern is this: I am very interested in physics and was thinking about pursuing it as a career, but I don't feel I'm smart enough to do so. I'm extremely right-brained - I'm an artist and have no problem grasping the concepts of art and literature. Math is...

Hi, I am a new member here. Find this forum very interesting. I don't find any request zone. So i am posting here. Forgive me if any mistakes. However, i need a software which will give me the graph of the given equation. That means i will enter an equation and it will show me its graph. Can...

I just read yesterday about a case of Larry Craig (http://en.wikipedia.org/wiki/Larry_Craig_scandal). He was a parliament member and in the bathroom of Minneapolis airport he was charged with sexually sociliting an undercover police officer. When I read the case, however, I found out he never...

Had a bad day at work and my design for a spark generator failed, so I'm asking for help. My requirements: To create a spark in a hard vacuum environment (10^-6 mbarr) To be ultra miniature (as a guideline about 1cm^3 is the space available) Available power lines is 4.4v at 0.22A or 700V...

I have a question regarding what material type and thickness could support a given load most cost effectively. Weight of the part will also be a factor in the cost due to the wacked out freight charges these days. I have no idea where to locate the information that I need or a formula so...

I have been pulling my hair out on this one. I have a double** that is a private member of a class. The constructor declares and initializes it as a 2 dimensional dynamic array of doubles (an array of arrays). Then it sets every element of the array equal to 0 with a set of two nested for...

Homework Statement is there any normal stress on torsional member? Homework Equations The Attempt at a Solution My professor showed me a circular rod made up of rubber and she made a rectangular hole on the side of it and asked whether there is any normal stress on the torsional...

I drew a picture of Leonardo Dicaprio. Here's one I drew of Jackie Chan.

A 3.5 m long steel member with a W310 x 143 cross- section is subjected to 4.5KNm torque. Knowing that G=77GPa, determine (a) the maximum shearing stress along the line a-a, (b) the maximum shearing stress along the line b-b, (c) the angle of twist...

I'm even sure I'm using the correct terminology, but I'm hoping someone can help me with a common problem I encounter. I frequently use the Gnu Science Libraries (GSL) in my C++ code to do various numerical grunt work. Commonly I need to provide a pointer to a function for a GSL routine to...

I am a new member to this forum, happy in joining here and hope that I will get all your support to share and get the valuable information from you all.

Google Tools... I want to know if PF forum members regularly use: Google, alerts... http://www.google.com/alerts" and if getting e-mailed links has helped you find or research information (Note: to busy college students...), or to keep abreast of breaking news ? Have you tried...

Homework Statement So when it comes to finding the zero force members, am I correct in assuming that any member previously eliminated will cease to act as a member for a point? http://img402.imageshack.us/img402/603/47362170.th.jpg so for example we know that IJ is a zero force member...

My brother recently sent me a couple of pictures from when we were children. I thought it would be fun for members to post pictures of themselves when they were children. Me and my older brother. I'm sporting my new Easter hat. This one my brother labeled "You and I back in the...

A few weeks ago, there was an announcement on the http://twitter.com/physicsforums" : I’ve been meaning to send https://www.physicsforums.com/member.php?u=187122"), but he’s been inactive. I figured he was likely on vacation. Well it’s been a few weeks now, longer than the usual...

At least that is what I am told when I ask it around here... How long would it take to go get to 45 miles per second at human tolerable acceleration? I am not a math whiz obviously, but I have some questions that get me some really strange looks, and no answers. I know that currently...

problem resolved

Hi everyone, I'm a new member. Just joined tonight, actually. I'm new to physics & cosmology. I'm here to learn as much as I can because it all feels natural to me. Hopefully some of you can better help me understand the basics and help me learn all I need to know. :blushing:

I found this problem in a book for secondary students. It says it's from the Australian Mathematical Olympiad in 1982. The sequence a_1,a_2,... is defined as follows: a_1 = 2 and for n \geq 2, a_n is the largest prime divisor of a_1a_2...a_{n-1}+1. Prove that 5 is not a member of this...

I need some help distinguishing the zero force member on two different trusses. In Figure 10.7: I said that Member CD and DE were zero force members. Is that right? In Figure 10.12: I said that Member AD was a zero force member? I am unsure how to find the force P as well? The...

iam tito in computer since from egypt in future academy egypt and i have 5 subjects in first term in the first year so i want some one to help me in Physics we have static electricity and coulomb law & electrostatic field & electric flux & gauss's law and more please help me...

Say we have two electrons in a spin entangled state about the z-axis |01> + |10>. One electron travels off to our left, the other to our right. The right electron passes through an inhomogeneous magnetic field with gradient solely in the z direction (Stern-Gerlach type), and subsequently...

Any way up i do want anyone to vote for me, seriously, even my funny bone has fossilised, and i am only funny some times by accident.

Need urgent help with this question on sound please! new member! Homework Statement The intensity of sound at the minimum threshold of hearing is 1*10^-12 W/m^2. A listner hears a 115 dB sound as an automobile passes by at a distance of 9.0 meters. a) what is the sound intensity in W/m^2 ...

Yes, it's almost that time of year. December will be here along with the Guru awards. All right all you funny people, start strutting your stuff. BobG is a shoe in. jimmysnider is too, but he refused to run last year. Artman is always hysterical. I will be taking suggestions for...

Homework Statement Homework Equations None The Attempt at a Solution The prof told us to treat the three-force member as an equilibrium of particle question. So here is the FBD and the triangle I set up for the particle equilibrium: I don't know where to go from there.. I...

Hi All, On some other scientific forums, it is possible to submit alternative theories papers. These papers are of course, discussed following the scientific rule "All things being equal...". Is there such a section in Physics Forums?

http://users.on.net/~rohanlal/truss.jpg Can someone please explain to me how it is that member FG is a zero force member? Isn't the only way for a member to be zero force if 1. Two non collinear members form a joint and no force is being exerted on this joint. or 2. When three members form...

Sorry if I write something stupid, but I am just a student. I really want to understand why the rejection of Cantor´s Set Theory. Considering the Cantor´s set concept, can a set be member of itself? Although I suppose that the answer is yes, my intuition answer no, it can´t! "A set is...

Hi, I was hoping a C++ guru could help me with a problem I'm having using the gnu science library (gsl) in my C++ code. Here is my issue: Take for instance the Runge Kutter codes for solving differential equations. You need to supply the gsl routines for this a pointer to a function describing...