Strength Definition and 1000 Threads

Homework Statement Find the electric field strength at point P, which is located midway between charges A and B. The charges are separated by 20 cm. The first charge has a charge of 20 micro coulombs. The second charge has a charge of -30 micro coulombs. Homework Equations Electric...

Homework Statement What are the strength and direction of an electric field that will balance the weight of a 1.0g plastic sphere that has been charged t0 -3nC ? Homework Equations E= F/q The Attempt at a Solution Newton's laws on the charged sphere ƩFnet(y) = F -mg=0...

I have some 1/4" thick 304 stainless steel formed in a 90 degree "L" shape (2 1/4" up x 2" flat x 2" wide. What force is required to bend pc beyound 90 degree mark (let's say to the 100 degree mark)

Need help in determining the impact force strength of a door stop rubber. It is a urethane rubber formed in a triangular shape. I used a 50t press with a 2" round shaft to compress rubber product and it required 100 lbs of force to compress. I believe this worked out to 18.75 ft lbs to...

Since the Gravitational Attractive Force is given by, F_g=(Gm_1 m_2)/r^2 Let m_1be the minor mass of a small body (e.g. human) let m_2 be the massive mass of a huge spherically symmetric body (e.g. Earth) Let r be the...

Hello. For free fall to occur, does the rate at which you fall have to equal the gravitational field strength at that point above the surface? If I'm in an airplane and accelerate towards the ground at an acceleration of 9.8ms^-2 equal to that of the Earth's gravitational field, then I...

The title is a bit deceptive but I've been very curious about something that many people who diet have found. Over the course of a few months, I was losing weight at a steady pace of 2lb/week. At one point I decided to make the most of my gym membership and start doing resistance training as...

Can anyone list these bond types in ascending order based on their strengths ionic bonds, covalent bonds, metallic bonds, hydrogen bonds, van der waals forces

There is a point between Earth and moon where the gravitational field strength is zero. What about the same thing with three or more objects? With three of more objects, is there always at least one point where the gravitational field strength due to the objects is zero? Why / Why not?

Hello all, I need to make a magnetic surface using neodymium disc magnets... the purpose for the surface is to hold on to a sheet of ferrous material, as strongly as possible. I tend to want to assume that a checkerboard array would be best... alternating the poles of the magnets in the...

Homework Statement The moon has a mass of approximately 7.34x1022kg and a radius of about 1785 km. Determine the strength of the gravitational field on or near the surface of the moon. Homework Equations I have made a list of equations that are relevant for this entire module on...

A VDGG is used to produce a large PD. The dome of the generator has a radios of 0.15m. It is charged and gets a PD between the dome and the Earth of 75kV. The charged stored on it is : 5.0 x 10-6C Answer: Use of E = Q/4∏εr0. 3.0 x 105 My attempt: E = kQ/r2 = 8.99 x 109 x 5.0 x 10-6 /...

Hi all, I read the following: "If g(t) starts with a delta function of strength Y/2, then..." I wonder what that means. Does it mean g(t) = 0.5Yδ(t) ? Thanks

Homework Statement For my project I need to calculate the maximum height that a Steel Rope could achieve while being hung between the Earth and the Moon. Homework Equations Tensile Strength of Steel is: 500*10^6 E of steel is: 200*10^9 distance from the Moon to he Earth is 406700...

Homework Statement What is the current in a long wire if the magnetic field strength 1.0 cm from the wire's axis is 55 mu T. i know magnetic field strength which is 1 cm i know the length which is 55 milli-tesla. I need to find Current in Amperes which is I. The chapter gives me the...

Is it possible to determine the strength of a bond given the elements involved and the order of the bond? If so, how does one go about doing so? The reason I'm asking is because I'm considering trying to code an analytical chemistry library as a way to increase my understanding of chemistry...

How does electronegativity affect bond strength? whats the strongest bond polar covalent, nonpolar covalent, or ionic how does electronegativity affect bond strength some people say the more electronegative the molecule the stronger the bond, so than shouldn't ionic bonds be stronger than...

Homework Statement The graph in the figure shows the electric field strength (not the field lines) as a function of distance from the center for a pair of concentric uniformly charged spheres. Which of the following situations could the graph plausibly represent? (There may be more than one...

Homework Statement draw equipotential lines and electric field lines for the following arrangements of charges: a) +4 at (3,5) b) +4 at (3,5) and +4 at (6,5) c) +4 at (3,5) and -4 at (6,5) d) +5 at (3,5) and -2 at (6,5) e) +4 at (3,4), (7,4), and (7,7) f) +4 at (3,4) and (7,4) and -4 at...

Which parts of the Earth is gravity stronger than usual, at higher points on the Earth is the gravity stronger or weaker than the lower points and why?

Homework Statement I am having trouble with question 1 on the attachment posted. I understand that i need to get the area of the 2 bars. I am just not sure what to do with the forces. ALso i know the picture may be dark. P2 starts at point B and is pulling to the right and P3 starts at...

Hi guys, I have to brush up my knowledge about self-dual Yang Mills and I'm reading an ancient paper by Yang about it...and of course I'm stuck...although Yang writes 'it is easy to see that'... Ok, so the self-duality condition of the YM field strength tensor is defined as...

If you were to mate a 1 ½” black iron pipe to a 1 ¼” black iron pipe using a 1 ½” coupling and a bushing reducer, how much bending torque would be needed before one of the parts or connections failed? That is, if you held the 1 ½” black iron pipe in a fixed position and the applied a force to...

Homework Statement the power density of sunlight, at the earth, is roughly 1 kilowatt/meter^2. How large is the rms magnetic field strength?Homework Equations The Attempt at a Solution I tried using the equation for power density S = E(rms)^2=√(εμ), then substituting B(rms)/c for E(rms), and...

Why does many sites always said the femur is the strongest and heaviest bone in the human body? I know the femur is the longest bone, but is it really that the femur is the strongest and heaviest bone in human body? This is a link where it is said that human femur and humerus are nearly equal in...

sorry if this thread is in the wrong place.. basically it's to do with electro magnets.. can you control the strength of them by something like a pedal? as in if you gradually push it the strength gradually increases? also would it be a health risk if you were right next to electromagnets...

Page 10 part (b) (ii) <click on the link Now, the question states : Use Fig. 4.2 to state and explain the distance x at which the rate of change of potential with distance is maximum Now electric field strength = negative potential gradient So in effect they're asking for the point at...

I have a solenoid copper coil 7 cm lengths, 5 turns, r =0.75; applied current 145 V; 0.73 A; frequency 1.10 MHz and I'm still not able to calculate the magnetic field strength in kA/m. Can you help me? I tried a number of formulas, but I just don't get it. :confused: Please point me in the...

Hello every1 .. i am sophomore so excuse me if i ask anything stupid/obviouse. so there are allot of proximity devices but with short range so i was thinking of making one with 2.4Ghz ℝℂ tx & rx. these typicaly have range to about 1km. So all i want to know is if there is a way to connect...

'It is a fact that this modern Samson's hair was so strong it could not be pulled out. One of the most astounding feats of strength ever seen was headlined by the Buffalo (New York) Evening Times on September 29th, 1928: "Mighty Atom -- Super Strong Man Pits Brawn Against Plane, Wins." At the...

hello world. it is know that electrostatic (coulomb's law) and magnetostatic (biot-savart law) fields lose their strength like 1/r^2. why do they say that electromagnetic field falls like 1/r ? is that true ? if yes how, can you explain please ? after all energy radiated from a point source must...

Hi, am I right to say that: Hardness is a material's resistance to plastic deformation. E.g. if a spoon is hard, it's difficult to bend it. Toughness is how much deformation a material can undergo before fracture. E.g. how much energy a spoon can absorb while deforming before it breaks...

1. Homework Statement At what distance (in m) from a very thin, straight wire carrying a 38 A current would the magnetic field strength be the same as a refrigerator magnet of 4.35 x 10-3 T? 2. Homework Equations B=(μo/2pi)*(I/d) where μo=4pi*10^-7 3. The Attempt at a Solution...

I have a scientific background in materials science. However this is one type of material that we don't exactly learn about! Let's say you have a neutron star approaching a comparable mass black hole. As the neutron star approaches the event horizon for such a comparable black hole, tidal...

Given a solid metal sphere where all the positive charges are distributed evenly on the surface of the metal sphere. My textbook says that there is no electric field strength in the middle of the metal sphere because the charge = 0. However, my understanding is that wouldn't the center of the...

I am currently installing some sail shades in my back yard. The manufacturer is callin for 6" tube steel supports but I believe that 4" tube steel filled and compacted with concrete will provide more strength and resistance to buckling. Obviously I am concerned about price but want to do a great...

I am working on an engineering project in which I am mounting an electromagnet onto a small RC robot. The link for the electromagnet is here http://www.mpimagnet.com/catalog.asp?prodid=670540&showprevnext=1 I was wondering if there was any way to calculate the force exerted by the magnet on a...

I have completed the force column in the table however I am not sure what the question is asking me for the field strength calculation. am i to use the 25μC charge or the 8μC charge in the formula 1/4∏ε x Q/r^2, this may be obvious to someone with more experience of these questions, Thanks

http://s3.amazonaws.com/answer-board-image/2924bffb-da01-4543-9697-b67da02e5a5a.jpeg The picture above shows four square regions. Each of the four regions may have its own uniform magnetic field. If there is a uniform magnetic field in a region, the field is directed either into or out of the...

I've looked everywhere and can't seem to find any information. Would someone be kind enough to point me to some literature?

Hi all, i have heard a lot of signal deterioration. so i just wanted to understand if i send a pulse let us say of some 5V and measure it using an oscilloscope and send it through a very lengthy cable and measure the same signal with an oscilloscope can i find that the amplitude of the signal...

Homework Statement The armature of an ac generator is a circular coil with 49 turns and radius 3.1 cm. When the armature rotates at 382rpm, the amplitude of the emf in the coil is 17.0 V. What is the strength of the magnetic field (assumed to be uniform) ? Homework Equations E = N.n.phi...

Hello, Suppose there are two conductors carrying currents. One of them is bare conductor and the other has insulation. Now magnetic field will be created around them due to the current flow through them. What will be the condition of magnetic field strength around them? They have same field...

I need to calculate strengths of welds / welded joints. Could you point me to a handbook or website? I will be a bit more specific. The welds are fusion welding w/o any filler materials and the materials to be welded are thin strips of stainless steel (thickness 5/1000 in)

I am trying to make a crude coil gun. I remember that if I run current through a coil of wire, it generates a magnetic field according to the right hand rule. Will the inductance of the coil of wire greatly affect the strength of the magnetic field, or is it mainly due to the strength of the...

I want to apologize ahead of time for my apparent inability to get LaTeX to display properly. Homework Statement λ = 3.8 x 10^(-6) C/m R = 32m r = magnitude of the hypotenuse (the book's convention, a poor choice IMHO) r = \sqrt{R^2 + x^2} k = 8.988 x 10^9 P:(0,-32) cosθ = x/r a→∞...

I have a poor physics book that doesn't really explain things easy. My book states that Strong force - 1 Electromagnetic force - 10^-2 Weak force - 10^-6 Gravity - 10^-43 This is the "relative strength between the 4 forces" is what my book says. But what does that mean? Is there...

Homework Statement Q. A metal sphere of radius 20 cm carries a positive charge of 2.0 μC. a. What is the electric field strength at a distance of 25 cm from the centre of the sphere? b. An identical metal sphere carrying a negative charge of 1.0 μC is placed next to the first sphere. There...

Hi guys I have a general query regarding Rubber O-rings. For an application , say seal between 2 mating flanges of pipes ,with water pressure say about 10bars, How exactly does the hardness of rubber effect the the sealing? Is there a direct relation between hardness & strength ? Can some...

Dave made a comment about curvature being a variable when determining strength of a material. I was wondering how curvature does affect strength in structures/materials. I know that "the more circular an object is the stronger it will be" is common knowledge. I am looking for something more...