Strength Definition and 1000 Threads

Are these two things the same? I'm looking at bioabsorbable copolymers with similar properties to the human acetabular labrum, but I can only find tensile strength values for the copolymers and tensile stress at break for the labrum. I've looked at the definitions of each it sounds like the...

Homework Statement An infinitly long conducting cylinder of Radius R carries a inform surface charge of (lambda per unit length) determine the electric field strength inside and outside the cylinder Homework Equations integral (E.ds)= q/e0 The Attempt at a Solution im not really sure what...

Hello again PF I am trying to find the failure load for a 6061-T6 Aluminum forklift pocket weld with 4043 filler. Can I simply multiply the cumulative throat area by the ultimate yield strength of the filler for this value? I never had any formal education on welds, wasn't sure if I'm missing...

I have to desgin an experiment for physics and and my research question is going to be: How does the cross-sectional area of the solenoid’s coil affect the strength of its magnetic field? This is my hypothesis, my question is if you think the reasoning is valid. I believe I should find it is...

i don't know whether to use the yeild srength or allowable stress to determine section sizes of a beam please help me :) thank you.

Homework Statement A capacitor is formed by two concentric spheres r1= 30 cm and r2=15 cm, with a liquid insulant between them with relative permittivity Er=4. The potential difference between the spheres is 1 kV. Find: 1. capacitance 2. maximum field strength in the gap between the two...

When Calculating Electric Field Strength using Q/kr^3, if the Q is negative is this negative disregarded? If not this would make E around a negative charge, negative. But if a positive test charge (q) is placed between two charges (Q1(negative) and Q2(positive)) then for Q1 (the negative charge)...

Hello, I just read a book reagarding Newton and his laws and had few questions about it. What is Gravitational field strength exactly and what is Newton's universal gravitational constant? Aren't they the same thing? please explain these two concepts simple enough for me to understand and to...

Homework Statement (This was part of an assignment that we had to create, so the question is one of my own, although I'm not quite comfortable with this area, hence why I'm asking for help) Calculate electric field strength of a positive point charge of 1.3x10-7C that is 5.3x10-4m away from a...

Is it true that deforming a ceramic will increases its strength? if yes or no why? Thanks

Hello all - this is my first time giving this forum a try. I've been using another site for a while but it's just too spotty and not enough folks there care to give decent responses, so here I am :) Homework Statement http://img684.imageshack.us/i/27p28.jpg/ What are the strength and...

I am wondering what would happen in the following scenarios? I am not looking for exact numbers, but generalized results. Say I have a rigid buoy that has a volumn of 2 gallons. I have a swimming pool or other large body of water. I have the buoy at the bottom of a ten foot deep pool...

Homework Statement Homework Equations The Attempt at a Solution I let µ be 9, as that's the approximate permittivity of air/ free space. I assumed that as a hat had a subscript y, it ran parallel to the y axis, and worked from there, getting the cross product of the unit...

How do flux meters work ?? On what basis they measure the strength of field please share the link (Urgently required)

A radio tower broadcasts within a 50 mile radius. At a minimum, how many such towers are needed to completely cover a 100 mile radius?

A friend of mine has a job interview tomorrow with a prestigious company. She is almost guaranteed the job because she's good friends with one of the hiring managers. Her current job has no room to grow, pays below average and has no benefits but she has pretty much made the owner stress free...

Homework Statement An electron in a cathode-ray tube is accelerated through a potential difference of 10kV, then passes through the 2.0cm wide region of uniform magnetic field.What field strength will deflect the electron by 10 degrees? Homework Equations Ki + Ui = Kf + Uf K =...

When I saw that the Feats of Superhuman Strength thread was active in S&D, it struck me that we need a thread dedicated to feets, as well. Personally, my feet smell like roses washed by a spring rain.

Hi, I was wondering what is the relationship between 'diameter size' and the strength to flex a hollow tube... is it linear or non-linear? I'm measuring the flexural load of different hollow tubes (with different diameter size) and looking for a way to normalize the the flexural load data...

Homework Statement Hey everyone, I'm just studying some physics, and came across this question where I don't know why I'm wrong =( It's from Physics (5th Ed.) by Halliday, Resnick and Krane - Chapter 27, Exercise 22 Positive charge is distributed uniformly throughout a long, nonconducting...

Does the magnetic field increase linearly with the number of magnets? For example, will 8 1/2 inch neodynium cubes have the same strength as a 1 inch cube? Thanks in advance

Difference between Electric flux density,electric field strength... I want to know the difference between,electric flux density and electric field strength.Are they the same? And also,there is a magnetic field(measured in Tesla),magnetic flux(in Weber),magnetic flux density(Weber per...

Homework Statement A wire carries a current and consists of three sections with different radii. Rank the sections according to the following quantities, greatest first: (a) current, (b) magnitude of current density, and (c) magnitude of electric field. Homework Equations i =...

In a test that was held many weeks ago.. We were asked whether concentration will affect the strength. The answer given by the teacher is yes.. As based on the concept of pOH... But i strongly disagree and i had a debate with my lecturer. . I said it should be based on Kb or percentage...

Hello, I am working on a project and I came across a question that is a little beyond my skill set. I am designing a support for a roof, and I have the force into the post, the length of the post and I need to determine what pipe I need, size, schedule diamter, etc. How do I go about this...

Hey guys, This may seem like an odd question but what would it entail to make an air compressor that can deliver 2000lbs of force? (I am not going to try and make one, don't worry :p ) When I say air compressor I mean any mechanism that runs on air. (Like an impact wrench) I ask this because...

Imagine the skyscraper and the very long rod placed on its top that rotates from horizontal position to upwards. http://img109.imageshack.us/img109/4817/fhfn.png I would like to know how is it possible to calculate/ascertain the maximal length and minimal width of the rod made of some...

I am looking to build a trapize style hanger that will be fabricated out of 2"x2"x1/4" cold formed steel tube 10'x4'x10' the shape is a U any idea where I can find the hanging weight of this type of hanger?

Hi, I'm a senior in high school trying to learn more about magnetism and magnetic shielding outside of my classes (I'm pursuing a degree in Materials Sciences at Penn State beginning this fall). I have been trying to determine a way to make a quantitative measure of a magnetic field's strength...

Hello, I design high powered rockets in our Tripoli rocket club. A particular plastic type of tube used is the Quantum 3.9 in dia plastic (sewer pipe) it is a thin wall design. http://www.publicmissiles.com/ They state that this basic tube is good for just .86 mach for compression loads...

I work in an industrial facility and I am trying to come up with a way to measure the strength of X-rays and the danger they pose to the operators of a piece of equipment we have. As of now there is an aluminum enclosure around the part of the machine where the X-rays are emitted, but we are...

I've heard from many sources that chimpanzees are 5x stronger than humans. Yet, they weigh less than humans and certainly don't look "big" and muscular. So the question is, how are they 5x stronger? Do they have muscles that are 5x bigger? It doesn't look like it. Are their muscles more...

Homework Statement An electron is launched at a α=38.5° angle and speed of 4.12×10^6 m/s from the positive plate of the parallel plate capacitor shown. If the electron lands d=3.03 cm away, what is the electric field strength inside the capacitor? Homework Equations t = d/v v0y =...

In Rc Stephen's book Strength op materials, the longitudinal stress in a cylinder(see) attachment caputure.jpeg. My question is how is the area(pi X d X t ) is derived as my calculations show that this area should equate to (pi x d x t + t x t)

I saw a MIT course on YouTube where the well know professor say that if I augment the height per 10 the strength augment by 100 (square) but the mass by 1000 (cube) so an animal would be 10 time relatively weaker if 10 time taller so he explain there is a limit to animal size because of this. He...

Science quiz question: How to determine the correlation between a car’s horsepower / torque and the maximum break strength of a cable that will hold the motor stationery. Assuming that the wheels of a car do not spin, how can I determine what the required cable’s break strength needs to be...

Homework Statement A coaxial cable has an inner core diameter 6mm and inner diameter of the outer sheath is 20mm. There are two layers of insulation between the conductors, the inner layer from a radius of 3mm to 9mm has relative permittivity of 8 while the outer layer from radius 9mm to...

Hi, why does fracture toughness decrease when a material increases in strength? How do one explain this relationship? Does it have to do with stress vs. strain curve? Thanks.

How are the numerical values of gravitational field strength and acceleration due to gravity on Mars related?

My understanding of colour so far is that if we had, say, a baryon with quark content uuu, we would need to invoke a new quantum number that would allow each quark not to be in the same quantum state to avoid violating the Pauli principle. Now apparently this new quantum number is called colour...

I have read a number of journal article that state that magnetic field strength diminishes inversely proportional to the square of the distance. BUT more than one has stated that the field strength is inversely proportional to the cube of the distance from the surface of the magnet. Which one...

What are the magnitude and direction of the electric field strength at point Z in the following: Point X, q1 = -2.0 x 10^-5 and it is 60 cm to the left of point Y, q2 = 8.0 x 10^-6, which is 30 cm to the left of Z. Essentially, this is what it looks like: X-------Y--Z

As a homework question, it asks, "...if the Earth were rotating so fast that the objects at the equator were apparently weightless?" Somewhere, someone said that, quote: In order for the rotation of the Earth to cancel weight, the gravitational field strength should equal the centripetal...

Hi, Does anyone know which insulator will have very high dielectric strength at room temperature? The dielectric strength is the electric filed strength of a material can resist before it breakdown.

One the practice problems i was doing in preparation for my exam was to rank the following nucleophiles in the order of decreasing reactivity, best nucleophile first. Nucleophiles: CH3OH, Br-, NH3, F-, CH3S- The answer was CH3S->Br->NH3>F->CH3OH What I don't understand is why CH3S- is...

Dear physicists, I am desperate. I am using a QM code to propagate a wavefunction of a system that experienced an electric field pulse. However, in literature all values for the electric field strength are given in V/m but the program asks for W/cm^2! I am kind of very confused here and did not...

Hi. After i first heard about graphene, a few ideas started forming in my head. but before i can even tell if they would work or not, I need some information on graphene i can't seem to find anywhere else. For one thing its molar mass and another, its physical strength.

Homework Statement coils rotating in a magnetic field are often used to measure unknown magnetic fields. As an example, consider a coil of diameter 2.00 cm with 72.0 turns that is rotated about an axis perpendicular to the field at a rate of 20.0 Hz. If the maximum induced emf in the coil is...

[SIZE="4"]I'm building a giant set of monkey bars for a gym and I'm curious about the strength of material I plan to use.I'm going to use two 4x4 3/16 thick steel tubing that will run 20 feet long and sit on top of the same material at each end 9 feet high.I will brace the top corners at each...

I am looking into calculating the weld bead strength. I am unsure of calculating the shear stress..the attachment has a drawing..any help is appreciated