Strength Definition and 1000 Threads

Homework Statement A continuous and aligned glass reinforced composite consists of 40 volume % of glass fibers, having modulus of elasticity = 10 X 10^6 psi and 60 volume % of polyester resin that when hardened, displays a modulus of elasticity = 5 X 10^5 psi. a) compute modulus of elasticity...

Hi I wonder if you could help a really thick oldie with a problem, I found this:- I need to build a set of ramps for my dump trailer. The ramps will be 6' long. I have and want to use 1" x 3" 11 gauge rectangular steel. If I were to take one 6' piece of this material, stand it on its'...

Homework Statement A space station consists of two living modules attached to a central hub on opposite sides of the hub by long corridors of equal length. Each living module contains N astronauts of equal mass. The mass of the space station is negligible compared to the mass of the astronauts...

Hello, I'm learning EM from Bleaney & Bleaney and got stuck on Ex2.1 (can do Ex2.2-2.7, though...) - If the polarization charge on the surface of a spherical cavity is -s.cos(theta), prove that the field strength at the centre is s/3e0. If I expand V(r) within the cavity as A.r.cos(theta) +...

DfH (CH3OH) = -201.6 kJ mol-1 DfH (H) = 218 kJ mol-1 DfH (HBr) = -36 kJ mol-1 DfH (Br) = 111.9 kJ mol-1 CH3OH + Br
CH2OH + HBr k(300K) = 1 x 106 M-1s-1; k(350K) = 4 x 108 M-1s-1 CH2OH + HBr
CH3OH + Br k(300K) = 1 x 107 M-1s-1; k(350K) = 7.7 x 108 M-1s-1 Any help would be...

First, I pondered about the concepts of force and pressure, force can't exist without pressure, vice versa. Imagine a an adhesive sandwiched between a tabletop and a silicon wafer. (this is part 1) Now, when you exert a shearing force Fshear above the adhesive and between the silicon...

http://http://session.masteringphysics.com/problemAsset/1074673/3/knight_Figure_32_14.jpg that is the diagram that accompanies the question. The 3 parts of the question ask what is the magnetic field strength at points 1, 2 and 3. I know that B=B_1+B_2+... for each point. In order to...

I built a catapult (trebuchet actually) last year for the "Punkin Chunkin" where you throw pumpkins for max distance. This year I am planning on a slightly larger one and need some advice on aluminum. We basically use a primitve crane idea to lift the weight up rather than using a hoist or...

Determintion of the volume strength of the solution of hydrogen peroxide provided... Homework Statement Hi, I have to dertermine the volume strength of the solution of hydrogen peroxide provided. NOTE the volume strength as I'm not quite sure how to get this! I had to dilute 10ml...

Homework Statement This is part of a lab I did, I am working on the writeup now. We placed a coil of wire inside of a Helmholtz pair, with 20V of 60Hz AC through the Helmholtz pair. The coil inside was connected to an oscilloscope and the induced voltages were recorded. I now need to...

this isn't exactly an specific question but a general one. I know that weak bases make good nucleophiles but how do I determine what bases are the weakest, what is weak enough to be considered a "good nucleophile" I'm a little confused please help thanks a lot!

Homework Statement You have 16 m of 0.7 mm diameter copper wire and a battery capable of passing 21 A through the wire. What magnetic field strength could you obtain at the center of a single circular loop made from the wire? Homework Equations Ampere's law The Attempt at a Solution I...

Homework Statement Suppose the resonant frequency is f = 1.47×1010 s−1; that is, the electron period of revolution is T = 6.80×10-11 s. What is the corresponding strength of the magnetic field? Homework Equations qvb=mv2/r qb=mv/r The Attempt at a Solution 1.6E-19*b=9.1E-31*v/r...

Hi, This is not homework, I'm just confused: I have been asking on the electrical engineering forum about calculating the strength of electromagnets. After some searching i have found the equations but i just can't quite get a handle on some of it? They have an iron core C shaped...

If a rate meter backs into a number of 2 million disintegrations per minute, is this a lot of a little? I am curious about a comparison - like it is the same amount of radiation coming from a smoke detector. Or - run for your life, that is pure plutonium you are dealing with. :) Thanks.

Hey all, I am currently working on a project with high voltage and wood. I have these values for dielectric constants of certain woods, but I can't seem to figure a way to convert this dielectric constant into dielectric strength. Anyone have a clue?

Hello Everyone, I've been trying to get the answer to this problem for ages now and I just can't match my answer with the one in the back of the textbook. I hope you can let me know what I'm doing wrong. Homework Statement What is the gravitational field strength at a place 220 km above...

Homework Statement A solid sphere 25cm in radius carries 14uC, distributed uniformly throughout its volume. Find the electric field strength (a.) 15cm, (b.) 25cm, (c.) 50cm from the sphere's center. R = .25m Q = 14 * 10^-6 C Homework Equations p = q/(volume) E = (kq)/r^2 The...

Is there a way to turn this tensile strength into maximum tension which is in Newtons?

Homework Statement (a) Find the altitude above the Earth's surface where Earth's gravitational field strength would be two-thirds of its value at the surface. Assume re = 6.371 multiplied by 10^3 km. wrong check mark km (b) Find the altitude above the Earth's surface where Earth's gravitational...

what are the principles regarding pipe OD, thickness & strength as well regarding round and square which one is more stronger. This matter came up becoz there are certain sizes of OD not available in HR but only available in CR, on the other hand there are certain sizes which we can convert form...

A 124 cm diameter loop is rotated in a uniform electric field until the position of the maximum electric flux is found. The flux in this position is measured to be 6.33 x 105. What is the electric field strength?

Hi, I need to calculate the fatigue strength of vascomax 350 material. I have referred Machine design Hand book, Author-Shigley The data provided and example calculation is for material having Ultimate strength less than 200ksi. The Ultimate strength of vascomax 350 is 350ksi . Please...

Homework Statement Calculate the electric field strength and the direction on the z-axis resultant from 3 line charges of blah blah and blah located at (x,y), (x1,y1), (x2,y2) respectively. Homework Equations I assume I just use E = k.Q/r^2 The Attempt at a Solution So I work out...

Hey, I'm trying to learn a bit about the strength of threads in bolts and have a couple of questions. Let's say I have a system that looks something like this: I want to find out if there are enough threads to withstand the force F. The nut and bolt material are not the same. I...

Homework Statement Two straight parallel wires are placed vertically on a wall. The distance between the wires is 12 cm and the current through each one is 7.5A. In the left wire the current is directed upwards and in the right one the current points downwards. Determine the magnetic field...

Homework Statement Three parallel wires are arranged in a partial square configuration with point P as the fourth corner. In two of the wires at opposite corners of the square, a 5.00×10^-4 A current flows toward you, and in the third wire opposite the point P, a 7.50×10−4 A current flows away...

We done an experiment of tensile test where we used the testometric machine that pulls different kind of material (aluminium, PVC, steel, brass) and generated graph stress/strain and etc, now we come to these questions: 1. Explain why the plastics/ polymer has a lower modulus and strength...

The electric field strength 5 cm from a very long charged wire is 2000N/C . What is the field strength 10 cm from wire. A)1x10^-4 N/C B)1x10^3 N/C C)9.9x10^7 N/C D) None of these I have E=kq/r^2 and infinite line charge E=(2k\lambda)/R 2000 * .05 m^2 /K =q q=5.56 E-8 k5.56E-8/.^21 m =...

Hey guys, I trying to work out this formula for work. We have a magnetic solenoid that is suspended a certain distance from a sensor tool. This sensor has 3 magnetometers that measure the field strength in Bx,By,Bz directions. The magnetic solenoid is run with a constant current of 0.75A. We...

Does anyone know how to determine what size/type of pipe/tubing would be necessary to withstand given wind speeds? Specifically, I'm wanting to build a "megatree", an outdoor Christmas tree made simply by stringing lights from the top to the bottom in a conical shape. I'd like a 20' + tree...

Does Earth's magnetic field strength increase with depth?

How would i work out the load baring strength difference between a hollow tube and a tube, with a x section throughout the length?(as per thread bellow) http://i323.photobucket.com/albums/nn463/pharllap/endview.jpg I love designing things and in this case I'm asking in respect to space...

Seatwork no. 1 -------Strength of Materials---------- The 20 mm diameter bolt fastens two wooden planks together. The nut is tightened until the tensile stress in the bolt is 150 Mpa. Find the smallest safe diameter “d” of the washers, if the working bearing stress for wood is 13 Mpa...

A bit of a problem. My book teaches me that E = -(dV/dx), where E is the electric field strength, V is the electric potential, and x represents displacement. But, it also suggests along with the above formula that E = -(V/d) and displays a circuit with a battery of p.d. V and two parallel...

Please check the attachment. The question is: Find the gravitational field strength at the point A in terms of G. So I went about assuming we use g = GM/r^2, for both masses, and then subtract them as we're meant to find the overall using vectorial addition. But, the answer in the back...

Homework Statement Two plates each have an area of 80cm2 and are placed facing one another in a vacuum. If the top plate carries a positive charge of 25nC and the bottom plate carrie, a charge of -25nC. Find the electric field strength between them. Permitivity of free space = 8.9 * 10^-12...

I am trying to recreate the Stern-Gerlach experiment and am having trouble trying to calculate the gradient magnetic field. I am using two magnets with one having a sharp edge and the other flat. I have calculated what the deflection will be of the electron will be in terms of the gradient...

this is just a question i can't seem to find an answer for, but i was wondering how strong a 5 tesla magnetic field is?

Permanent magnets are advertised as having some scalar strength, say, 1.5 Teslas, depending on the composition of the magnet but not its volume. I'm confused about what this means. Shouldn't the magnitude of the magnetic field vary depending on where you measure it? And if I epoxy together two...

The question in question: "If charge was plotted versus electric field strength; what shape of graph would you get? How would you straighten in? What quantity would the slope of the straightened graph represent?" Related equation: |E|= F/q Ignoring the graphing information, the question...

What is the relationship (generally speaking) between film strength, film thickness, and viscosity: If I polish / superfinish the gear teeth, and bearings on trans, can I go with a lighter viscosity oil, to improve the efficiency of a manual transmission, while still keeping reasonable safety...

http://www.sciam.com/media/inline/A070BA0E-9DA1-A982-E2844D04DDC05DC6_1.jpg http://www.sciam.com/article.cfm?id=real-life-iron-man-exoskeleton

[SOLVED] Distance between two charges where field strength = 0 Homework Statement Two particles having charges q1 = 0.500 nC and q2 = 9.00 nC are separated by a distance of 2.00 m. At what point along the line connecting the two charges is the total electric field due to the two charges...

Another noobish question: Let's say there is an electromagnetic wave of constant wavelength and constant peak amplitude that travels a known distance. Let's say that we also know the total energy of this EM wave. Is there some formula that can tell us what the peak value of the electric field is...

So, I'm playing around with electromagnets right now and I was wondering how to calculate (or determine experimentally) the approximate strength of the electromagnet. What I'm doing right now is using the formula for a solenoid, B=\mu_o N i and adding the constant for whatever material is in the...

I have two cathode ray tubes which generate the same amount of beam, i.e., one tube fires off x electrons per second to the screen at velocity m; the other fires off x electrons per second at velocity n. Say m=2n. 1. Is magnetic field FROM BEAMS ALONE the same?? 2. One twice the...

Homework Statement Charge A has 10 electric field lines coming out, Charge B has 20 lines coming out, and Charge C has 30 lines coming in. Which pair of these charges will have the largest force between them if placed one cm apart? Homework Equations The Attempt at a Solution Is...

Does anyone here play piano? I recently learned Fur Elise but the more I play it the more my pinky muscle gets sore and usually I just have to quit in the middle of the song from these weird pinky muscle spasms. Does anyone know how I can make my pinky muscle stronger? Will it eventually be...

[SOLVED] [101] Magnetic field strength in fN Homework Statement You have arranged that the magnetic field in a particular region of space is due North with a value of 0.01 T. An electron enters the field traveling to the West with a speed of 0.05 of the speed of light. As a result, the...