Strength Definition and 1000 Threads

Homework Statement May i know how to know boom and rod, which is in tension and compression? http://img7.imageshack.us/img7/5728/16203309.gif http://img7.imageshack.us/img7/2595/57134603.gif Homework Equations The Attempt at a Solution

1. Homework Statement The electric field strength 7.79 cm from a very long charged wire is 2660 N/C. What is the electric field strength (in N/C) 12.7 cm from the wire? 2. Homework Equations E= (9*10^9) Q/ r^2 3. The Attempt at a Solution i have energy. so is tried to solve...

Homework Statement The electric field strength 8.05 cm from a very long charged wire is 1310 N/C. What is the electric field strength (in N/C) 30.0 cm from the wire? Homework Equations E=F/Q E=KQ/R^2 The Attempt at a Solution First I try to find the charge using E=KQ/R^2...

Here are some great Strenght Of Materials problems.. Scroll down and under the coursework problem click the example and take a look at the different problems.. Those are fully solved. I'm not sure how long the site will be active but its very helpful so download the pdf file before my professor...

Homework Statement This is a question on a past paper of a second-year undergraduate physics paper. A parallel plate capacitor is charged and the voltage increases at a rate of dV/dt. The plate radius is R and the distance between the plates is d. (a) What is the electric field...

Homework Statement A steel wire is being hung from a high altitude balloon. What is the greatest length is can have without yielding if the steel yields at 40 ksi?? Homework Equations I know all the stress and strain equations but I have yet to find or be taught an equation for finding...

in general, do ductile matreials fail due to shear or tensile stress i think that my lecturer said that brittle materials (such as concrete) will fail due to a low maximum shearing stress therefore breaking at 45 degrees in axial loading, and ductile materials have low tensile stress leaving...

HI, I have builded a tube buggy out of square 1"1/2 x.085 and was told that it was unsafe so I'm looking into it. Was my design unsafe? My question is round stronger then square if so how much? Question 2 dose welding weaken the steel? Question 3 if round is stronger how much stronger is it...

I have a grade specific query. We are currently using 35 mm dia shaft of 1020 grade steel. We want to upgrade to 4140 steel of same diameter. Researching on google and this forum i found out the ultimate tensile strength of 1020 grade is 710 MPa and UTS of 4140 grade is 1080 MPa. But that's...

It is not a homework problem, thought it can kinda be. But when they show you a diagram with object A and B, If the electric field point towards A and away from B. Does that mean that A is + and B is -?

Homework Statement - How much is the electrical voltage U between two evenly electrified parallel flat plates, distanced d = 1 cm, if the strength of electric field between them is E = 1 V / m? - - What is the strength of electric field to the left and to the right of each plate? - What is...

What is the unit of 'strength' of the fundamental forces? When it is said that gravitational force is weaker than the strong nuclear force, how are they compared? What is meant when it is said that the fundamental forces approach each other in strength at higher energies in the early universe?

which one of them has the strongest intemolecular bond CH4 ,Ne ,KI ,MgSO4 ,CO? there are london powers van der vals hydrogen bonds i don't know how to apply it here ?

Hi, i read my online note, it state that yield strength is stress at which noticeable plastic deformation has occurred but why when i see the graph, it doesn't means like what it written. below is the graph make me confusing.

I know it has to do something with the Breakdown voltage but I've looked everywhere on my book and i have no idea how to calculate it.

What's the formula to calculate it, I've looked everywhere.

Hey i worked out this answer for the electric field strength at a point due to three point charges. E = -46736i + 46736j -39546k How do i convert this to V/m? eg. 12345 V/m I have checked everywhere Thanks for any help

This web page: http://www.hghouston.com/ss_cwp.html states: The web page also shows that fatigue strength can be improved dramatically by cold working. Endurance limit is listed as: 304 annealed = 35 ksi 304 3/4 hard = 92 ksi I'm in the process of designing something that will be...

Homework Statement In such a picture, http://i1021.photobucket.com/albums/af335/hectoryx/electrostaticequilibrium_1.jpg Induced charges will emergence on the left and right side of non-perfect conductor B, because the effect of the electric field of conductor A. As is known to all, when...

I understand that Dielectric Strength relates to the point where a compound breaks down under electrical load. Please correct me if I have it wrong. I want to now if an RTV compound (with Dielectric Strength of approx 500 volts/mm) is safe to use across 240v or 415v terminals that are 3-5mm...

What minimum strength of magnetic field is required to balance the gravitational force on a proton moving at speed 3 x 10 to the 6th power m/s?

If the electric field lines are curved as opposed to straight, say from straight parallel lines parabolic curves develop, would there be any change in the field strength? ie would it be stronger when the lines are parallel than when they curve?

Gravitational force is divided by distance squared. What is the equivalent divisor for a fixed bar magnet? Thank you for your kind attention :-) (-_-)

I've been given the question to compute the strength in the van allen belts when given the strength of Earth's magnetic field at the surface. Then, I am supposed to calculate the gyroradius of a 50 MeV proton from the strengths I come up with. I want to know if I am going about this correctly...

I have access to definite definition to terminology like stress(Pa), strain(dimensionless), ultimate strength(Pa), yield strength(Pa), etc. But I often get confused when someone just write "strength". I give an example. Consider the following sentence: "Titanium has high strength and high...

I need to erect a hoist beam with a 10' span using square tubing. Which is stronger, 3"x3" 1/4" wall or 4"x4" x 3/16"? Also, how much weight could I lift at the center?

Why is a smaller angle better than a larger angle for a guy wire?

Homework Statement What is the magnetic field strength on Earth's surface at either pole? Earth's magnetic dipole moment is D_0 What is the magnetic field strength on Earth's surface at either pole? B = ____ G Homework Equations _u = NIA ; N is the number of turns I is current, A...

I got confused in dealing with ionic strength. Homework Statement In calculating ionic strength, do we consider the composition of the solution? Take for example: Solution 1 has 20 ml of 0.1 M NaCl and 35ml of 0.2 M CaCl Solution 2 has 25 ml of 0.1 M NaCl and 30 ml of 0.2 M...

Hi all, Found this forum while looking for some resources for my students...my short question is: does anyone know of a simple explanation of the physics involved in tying knots in rope? Background is - I am a chemical engineer by degree, but I recently taught high school physics for a few...

It's been awhile since I've been on, but I'm still working on my brake system for my track car - https://www.physicsforums.com/showthread.php?t=304215. I now have the hats and brackets machined, and I'm trying to decide what to do for the finish. At first I was set on anodizing as it'll...

Can gravitational field strength cause time dilation. as G.F.S on Earth is 10 N/kg and on moon it is 1.6 N/kg. so will a clock on the moon surface tick slowly for the observer on Earth or not?

so here it is, I want to build a sphere with pressure being exerted uniformly on all sides. the sphere will be immersed in a fluid and have mass pumped out(to create buoyancy.) I have calculated the strength of the sphere to be... C=((Pw-Pi)r)/2T where Pw=Pressure of the Water Pi=Internal...

I'm currently compiling a report on the strength of balsa woods planks under a three point test. Thus far I've found that maximum load shrinks as length does, upto a point, beyond which max load increases. This doesn't fit with the proscribed flex. strength = 3FL/2bd^2 formula. Is there...

When it is said that the relative strength of weak interaction is \ 10^{-5},what does this mean? On calculation I am getting \alpha_w=\10^{-3} with \ G_F=\ 1.16\times\ 10^{-5} \ GeV^{-2} I had an impression that \alpha_w should be \ 10^{-5}.Which one is correct?

I was puzzling the Levitron today, and was trying to figure out what the magnets involved strength was, on the off chance that I may build a larger one for kicks. However, after some moderate googling, it doesn't seem like figuring out the strength of a magnet is a quick or 'easy' task...

why does stress decrease after it reaches its maximum tensile strength after its plastic range ?

For the same building with square vs. circular concrete columns of equal number and cross-sectional area, under what environmental conditions would one be preferred over the other?

Is there any way to dampen the strength of a standard magnet? Some kind of material you could put on it to make it weaker? Thanks!

I am having difficult finding the meaning of the term 'fracture strength'. http://en.wikipedia.org/wiki/Flexural_strength" it means the flexural or bending strength but that is unsourced and marked as dubious. I was also wondering if it could be synonymous with fracture toughness or something...

Hello all of you! I'm looking for reliable data about the dielectric strength (=breakdown field) of liquid insulators with a high permittivity and a low viscosity and not too dangerous. Examples of such liquids: - Ethylene glycol carbonate. Propylene glycol carbonate. Maybe the oxalates...

Is there a limit to how strong a material we can create? Does yield strength have an upper bound, and how high is that upper bound above materials created today? What about hardness? Is Diamond the limit? Could we ever make a machine that could survive the pressures and temperature found in...

Im not sure how to analyze this. I have a 8ft dia. pipe casing that I am submerging into the mud in 10 ft of water. the top is open. What i need to find is if the .25" wall thickness is sufficent to keep the casing from collapsing. I know i have about 624 psf at the bottom of the casing...

I have read through countless discussions, and have still to be convinced that gravity is weaker than the other fundamental forces, even though this is the accepted wisdom. My argument is that it is mass which dictates gravitational attraction, whereas charge, for example, is responsible for...

Is "Section Modulus" the same as a cross sections "bending strength modulus"? Good afternoon everyone, I am following an ECE directive that sets out the requirements for the properties of a "Rear underun protection device" for the rear of a lorry. It states that the underun bar must...

Hey all, I'm trying to make a cylindrical bonded magnet, but I need to compress it in a non magnetizable pipe capable up withstanding up to 10000 psi pressure, 1 cm or less in diameter. PVC only has a tensile rating of 7500 psi so it won't do. i would like to know what plastic(or any non...

Hi all, I was wondering if anyone knew, or if anyone knows where I can find, the maximum magnetic field that a micro - electromagnet can put off... I am sure this depends on a lot (thermal degredation, materal properties etc) but I just need an estimation as I am running a simulation and need a...

Hi all, I was wondering if anyone knew, or if anyone knows where I can find, the maximum magnetic field that a micro - electromagnet can put off... I am sure this depends on a lot, but I just need an estimation as I am running a simulation and need a typical value. I ran the simulation with...

Homework Statement How many times stronger is the force acting on the conductor at 90 degrees than it is at 30 degrees? Homework Equations F = ILBsin(theta) The Attempt at a Solution I would think the answer is two times as strong because sin90 = 1 and sin30 = 0.5. But the...

I understand the distinctions of the different types of material strengths, but I get stumped when asked about how they apply when the material discussed is thicker or thinner. Any help?