Strength Definition and 1000 Threads

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?

Hi everyone, i am new to this and am struggling badly on a distance learning module for Subsea technowlogy. The question is. Find the equation for equivalent stress for a 3 dimantional stress regime? and when would this equation be required? I really would apreciate some info on...

I'm new to the forum, so hello! How can i calculate the magnetic field strength of the pulse of an air core coil, the number of turns is 20 & the height of the coil is 20mm, not single or multi layered just random wound. The pulse is 10V & 1Amp, the Inductance is 200uH. Not sure how to go...

I have a component made of some sort of stamped steel which has a significant magnetic field (upto 2000mGa) which I need to use near a sensitive magnetic sensor. The field is high enough to saturate the sensor so I can't calibrate it out. Does anyone have any idea about degaussing? I tried...

I am building a motorcycle trailer. I have 2 x 2 square tubing that is about 1/16 thick and it will be about 6 and 1/2 foot long the trailer will need to hold 433 that is how much my motorcycle weighs. Does any know of a site or somewere that I may find this information so that I can start on...

Could anyone please help me? If I have a piece of aluminium Angle that is 30mm x 30mm by 3mm thick and 1m long, if I were to substitue this with a piece that is the same thickness and length but 60mm x 60mm what increase in strength would I see? If instead of increasing the size what would...

Hi all, I've been looking at a few trusses lately and was wondering what the main factors are that influence the overall strength of a truss bridge? I have an idea that the more members taking loads, the stronger the truss, hence members should be at sharper angles. Of course i could be dead...

Installed a D-Link DIR-655 Router for my wireless network. The network consist of 3 desktop computers, 3 laptops, and 1 Blu-ray (netflix setup). The only problem is that one laptop has a signal strength that varies from (the high) that I have seen, 38Mbps down to 1Mbps. The trend seems to...

We've heard of the water pipe analogy for electric circuit. It says that the current produces magnetic field and that the "pipe" is irrelevant - only the amp-turns are relevant. So I was wondering, is it possible to increase the amp-turns of a electromagnet by rotating it in the same direction...

Lets say I have a point charge X placed on a region between a +Q test charge and +2Q point charge where electric field strength is zero. Since E=-dV/dR, does it mean V=0 or constant? Can the point charge move if i place it there? Well let's just ignore gravitational field/force here.

Hi Guys This is my first post. I hope someone can help. I'm building a hovercraft, the fan that lifts the hovercraft is made of pine timber and the blades are carved from the pine. The blades weigh 200grams each and are spinning at 3000rpm. Question, if a blade broke of wilst spinning at...

Homework Statement A rigid steel plate is supported by three posts of high-strength concrete each having an effective cross-sectional area A =40000 mm2 and length L = 2 m. Before the load P is applied, the middle post is shorter than the others by an amount s = 1.0 mm. Determine the...

Hi ! I've a question. Where is the connection between the (kinetic) Lagrangian - \dfrac{1}{4} F_{\mu \nu} F^{\mu \nu} and a plane wave of the form \vec{\varepsilon} exp(i \vec{k} \cdot \vec{x}) / \sqrt{V} (the epsilon is a polarization vector) confined in a box with a finite volume V ? I...

what are the components to find the magnitude of the electric field strength when only potential difference and that there are two oppositely charged plates that are separated by a given distance.

Homework Statement A square, with charges at each corner. The upper left (1) has a charge of +q. The upper right (2) has a charge of -2q. The bottom right (3) has a charge of +2q. The bottom left (4) has a charge of -q. The square has side length a. a = 5.20 cm and q = 11.8 nC Find...

[b]1. State what is meant by the compressive strength of a material [b]3. The answer given in the mark scheme says - (compressive) stress/F/A/pressure AND to break/yield/shatter does anyone know what the answer to this question is? i don't really understand! thanks.

Homework Statement if linearly polarized light has an electric field strength E, what is its field strength after it has passed through polarizing material that has a transmission axis oriented at an angle theta relative to the direction of E? Homework Equations none.The Attempt at a Solution...

Homework Statement The gravitational field strength of an unknown planet is 15.5 N/kg on its surface. Calculate the value of “g” if the planets mass and radius were both doubled. Hint: Use variation. Homework Equations g= GM /R2 The Attempt at a Solution Well my teacher gave a...

what the energy spectrum to second order in the field strength for a spherical shell?

Homework Statement http://img291.imageshack.us/img291/9572/picture2ehv.png What is the strength of the magnetic field at point P? The answer is 7.9×10^−5 T. However, I used the equation B = u*I/(2*pi*d) and keep getting 5*10^-5 T. Homework Equations B = u*I / (2*pi*d)...

Homework Statement 50 pJ of energy is stored in a 2.0 cm*2.0 cm*2.0 cm region of uniform electric field. What is the electric field strength? Homework Equations not sure The Attempt at a Solution not sure how to start this problem

Homework Statement Examine the ductility of the Al-Cu alloy. Note how brittle the mixture is- most unlike copper or aluminum-Why? 2. Relevant Information The alloy was a 50-50 mix of Al and Cu heated to 700C and then poured into a mold, before the eutectic temp was reached the...

Hi guys, i have been searching for ages to get figures for the proof or yield strength of EN1A steel, which is now known as 220M07 as per BS970. I have managed to obtain the Tensile strength, but would anyboday please be able to help point me in the right direction to data for the yield or...

Please help me with the following: What is the field strength needed to achieve a current density of 5 x10^4 [Am^-2] in a conductor of resistivity 5 x 10^-8 [Ω m] The answer I got was 2.5 x 10^-3 N C^-1 using the equation J = σ E But then I was wondering when a situation like this occurs and...

Homework Statement A rectangular beam is cut out of a cylindrical log with diameter 30cm. Given that the strength of a beam is jointly proportional to its width and the square of its depth, find the dimensions of the beam with maximum strength. Homework Equations implicit...

Question Details: Is CO paramagnetic or diamagnetic? i put diamagnetic because there are no lone paris is that corrects? and If CO gained one election, becoming CO^-, would the bond become weaker or stronger? i believe that the bond would become weaker since there is one lone pari and it...

Homework Statement a) What is the strength of the electric field at the position indicated by the dot in the figure? b) What is the direction of the electric field at the position indicated by the dot in the figure? Specify the direction as an angle above the horizontal line. Figure...

Homework Statement The tallest spot on Earth is Mt. Everest. But another well-known mountain is the Mont Blanc, European Alps, which is 4807 m above sea level. If the radius of the Earth to sea level is 6367 km, how much does the gravitational field strength change between the sea level value...

Homework Statement Consider three charges arranged as shown. What is the magnitude of the electric field strength at a point 2.7 cm to the left of the middle charge? The value of the Coulomb constant is 8.98755 × 109 N · m2/C2 . Answer in units of N/C. Homework Equations I'm truly...

Hi guys, I'm having trouble tracking down some material information for this steel, E9310. It's listed in the Aerospace Structural Metals Handbook under Ultra High Strength Steel. AMS specifications include: 6260J 6265F 6267B I have quite a bit of data for it, but I'm looking for a...

Physics mega-novice (i.e. moron) here, so I'm probably not thinking correctly about these things. Just curious which item below is close to what's generally understood about light and black holes. Maybe none are nowhere near being close, I would not be surprised. Concept #1 A gravitational...

Hello, I read chapter 7.1 of "An Introduction to Quantum Field Theory" by Peskin and Schröder and have two questions. They derive the two point function for the interacting case. On page 213 they manipulate the matrix element, after insertion of the complete set of eigenstates. <\Omega...

It's common to hear people say that gravity is a "weak force" and that it is "32 times weaker than the weak nuclear force." But what does that even mean, if it has any meaning at all. The gravity on a particle is proportional to its mass. The electric force on an object is proportional to its...

Dear All, How do i calculate the Electrical field strength in v/mm for a Kapton Insulated Cable. Conductor AWG 24/19 - 0,6 mm Kapton wall thickness : 1,0 mm Voltage : 15 KV Thanks.

I have a suspension arm that I am rebuilding, the main reason is to make it adjustable in length, and the other is to replace the ball joint. The original equipment is a standard automotive ball joint, greased and the shaft is 1 piece with the ball. The new setup would use a 5/8 spherical...

I know how to do it one way, which is write down the chemical formula, balance it, and from the molarity of the products/reactants you calculate your H3O or OH concentrations and go on, but it seems to take forever. This is worse when I need to calculate pH for a whole list of different...

Homework Statement Two 2.0-cm-diameter insulating spheres have a 6.50 cm space between them. One sphere is charged to + 89.0 nC, the other to - 95.0 nC. What is the electric field strength at the midpoint between the two spheres? Homework Equations Esphere = KQ/r^2 k = 8.99 * 10^9...

Homework Statement Halliday and Resnick edition 7 chapter 22 number 29 In Fig 22-45, positive charge q = 7.81 pC is spread uniformly along a thin nonconducting rod of length L = .145m. The y distance between the point and rod is R = .06m. What is the magnitude and direction of the...

What I'm trying to do is determine the surface strength of a material. I'm not sure if Barlow's formula would apply, as it's not a tube, but rather a flat surface. The pressure will be exerted on a particular spot on the flat surface. How can I calculate this? For the record, I'm asking...

i know that the strongest bond is between metal and non-metal like NaCl after it comes the hidrogen bonds which H bonds with N or O or F after that comes the dipole- dipole bond i don't know how to recognise it regarding what substances and how they look after that comes dipole-...

As a pendulum can be used to calculate the gravitational field strength by using the equation Time period= 2(pi) sqrt (length/g) this equation assumes that the pendulum bob is moving in Simple harmonic motion. However at very small lengths the pendulum bob tends to move in a more...

I answered a question that my professor asked: "Why is the boiling point of HF much higher than that of HCl even though HCl has a larger molar mass?" The answer had to do with F being more electronegative than Cl and thus making stronger H-bonds. He also said on an aside that it all boils...

Hi I'm an MPhys Physics with Astro student, conducting my final year project in the field of radio astronomy (well, it's more like electronics at the moment - trying to fix a downconverter, but anyway...) My question: I'm interested in observing the 6.67GHz methanol maser emission. For a...