Strength Definition and 1000 Threads

  1. W

    Pipeline stress and strength problem

    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...
  2. H

    What is the field strength of a pulse in an air core coil?

    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...
  3. M

    Creating a Degausser to Reduce Magnetic Field Strength

    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...
  4. A

    Is 1/16 Inch Thick Square Tubing Strong Enough for a Motorcycle Trailer?

    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...
  5. R

    Increase Strength with Aluminium: 30x30mm to 60x60mm and 3mm to 6mm

    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...
  6. L

    Influence the overall strength of a truss bridge?

    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...
  7. RonL

    What Could Be Causing Inconsistent Wireless Signal Strength?

    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...
  8. K

    Can spinning an electromagnet increase its strength?

    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...
  9. D

    Calculating Short Beam Strength of Liquid Nails

    I am trying to calculate the "short beam strength (\sigma_{sbs})" of Liquid Nails (a wood adhesive). I did a strength test of two square beams held together by the Liquid Nails and recorded the data. I also have data of a strength test of one of the wooden beams by itself. How would I go...
  10. S

    Question about Electric Field Strength and Electric Potential

    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.
  11. C

    Aluminium Strength: Building Hovercraft Blades for Safety

    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...
  12. K

    Strength of materials question

    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...
  13. P

    EM Field strength and plane waves

    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...
  14. D

    Potential difference to find the magnitude of the electric field strength

    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.
  15. W

    Finding the field strength of an EF

    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...
  16. C

    State what is meant by the compressive strength of a material

    [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.
  17. M

    Linearly polarized light and its field strength.

    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...
  18. A

    Gravatational Field Strength problem (Grade 12 physics)

    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...
  19. R

    The Effective Strength of Multiple Disc Magnets Stacked Together

    I spent a long time just trying to find the right equation and it was no surprise that I did not understand a variable of it. Homework Statement Why is it that a tower of identical disc magnets behaves differently (is stronger than?) a single magnet. Known: NO NUMBERS Each disk is...
  20. E

    Second-Order Field Strength Energy Spectrum of Spherical Shell

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

    Strength of magnetic field at a point

    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)...
  22. R

    What is the electric field strength?

    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
  23. T

    Examining Ductility of Al-Cu Alloy: Brittle vs Copper & Aluminum

    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...
  24. M

    Proof/Yield Strength required for EN1A carbon steel

    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...
  25. A

    What is the field strength and when does a situation like this occur?

    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...
  26. E

    Optimizing Beam Strength: Finding the Dimensions for Maximum Performance

    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...
  27. C

    CO Paramagnetic/Diamagnetic & Bond Strength

    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...
  28. R

    Where Did I Go Wrong in Calculating the Electric Field?

    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...
  29. L

    Change in gravitational field strength

    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...
  30. C

    Finding magnitude of electric field strength

    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...
  31. M

    Material Data - E9310 (Ultra High Strength Steel)

    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...
  32. C

    Does speed of light also mean strength of light?

    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...
  33. P

    Peskin Schröder Chapter 7.1 Field Strength Renormalization

    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...
  34. T

    The meaning of the relative strength of forces

    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...
  35. N

    How Do You Calculate Electrical Field Strength in Kapton Insulated Cables?

    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.
  36. C

    Single Shear Bolt application, strength info required

    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...
  37. F

    Determining Acid/Base Strength and Ionization

    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...
  38. A

    Two spheres, solve for electric field strength

    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...
  39. G

    What is the Electric Field at Point P Due to a Uniformly Charged Rod?

    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...
  40. H

    Calculating Surface Strength for Aluminum Foil and Other Materials"

    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...
  41. T

    What are the different types of intermolecular bonds and how do they differ?

    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-...
  42. matt_crouch

    Gravitational Field Strength Calculations with a Pendulum

    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...
  43. Saladsamurai

    How are atomic radii and H-bond strength related?

    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...
  44. S

    Methanol Maser Emission: Strength and Effects on Earth

    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...
  45. J

    What is the relationship between amplitude and strength in radio waves?

    This may be a very dumb question, but I was wondering, does amplitude function as a measurement for "strength" for a radio signal (by strength I mean the ability of one wave to dominate another on a receiver)? I know that hertz defines the frequency, which I understand as the part of the...
  46. J

    Effect of High Strain Rate on strength of Metal

    What is the main reason for changing the strength of metals under very high strain rate? Do all metals show the similar trend in increased strength under high strain rate? What is the effect of crystal structure on this phenomenon?:!)
  47. C

    14 Tesla magnet strength? Too much?

    I used the formula here: http://en.wikipedia.org/wiki/Magnet#Force_between_two_bar_magnets The values came from an experiment in which I found the force between two small Neodymium magnets by balancing with the force of gravity (it was around .15 Newtons). Am I using this equation...
  48. R

    RSSI (Received Signal Strength Indication)

    I am trying to build a RSSI for a incoming signal I would like to have the system to be the highest accuracy available. But my problem is that I understand very little about what RSSI actually is. We are in the prototyping phase of the system so the frequency isn't set in stone yet. What is...
  49. M

    Formula for the strength of an electromagnet

    Trying to determine the strength of an electromagnet in Teslas, with an iron core. Some sites have the same basic formula but with different units after B= Some use μ0, μr, or μ. Which one to use? For N (the number of turns), is this the general number of turns accounting for multiple...
  50. S

    HELP required calculating spring strength.

    I have recently redesigned an antique falling block single rifle action and need some help calculating the poundage of the firing pin spring. A test that is often used to determine if a firing spring in a gun is still in serviceable condition is to place a coin, which weighs approx 10 grams...
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