Strength Definition and 1000 Threads

I don't get the following passage from my textbook. Why can't the magnetic force be measured? I don't see why there is no unit for p. If one pole of a long, thin bar magnet is placed in the vicinity of one pole of another long, thin bar magnet, Coulomb’s magnetic force law states: The...

Hi Atoms are closer in FCC. Does it imply high bond strength? It does imply low bond energy.

Homework Statement How much force is required to punch a hole ½ in. in diameter from a 1/8 in. thick steel sheet of shearing strength 4x104 psi. Homework Equations Shearing Modulus = Pressure/Shearing Strain Pressure = F/A Shearing Strain = DistanceSheared/Length-to-be-sheared...

Say we could slowly vary the strength of the strong force. What would happen to the "size" of proton if the strength of the strong force tended to zero and infinity? Thanks for any help!

What is the process called of heating alloys to Hightemperature 10,000f+ and making them many times there normal strength? do most uivercitys have such a machine? I read about it years ago in New scientist magazine, any help would be great Andrew Perry

I know that I should do my homework, but I lost all my notes because of the flood brought by "Sendong" a storm in the Philippines. I just need the equations to be used to solve the problem that was given to us. So here it is: A parallel plate capacitor has a capacitance of 7MF when filled...

I am building a DIY backyard zip line - total length is 175 ft, starting anchor is a steel pole (6 inch diameter) - 21 ft long, I plan to bury in lots of cement about 4 ft deep - cable will be attached near the top, no guy wires planned, I will "board" the seat on a tree fort near the top of the...

Inside a black hole singularily, the center is pulling spacetime to it, but because the spacetime fabric inside and outside the event horizon are connected... it doesn't shear or break. But during a Big Crunch, the entire spacetime of the universe would be sucked back into the singularity and...

Homework Statement 2 point charges are situated 45nm apart in a vacuum. Charge A is +8μC and charge B is -25μC. X is a point 8nm from A. Calculate the electric field strength at point X only due to A (Ans is 1.2 x 10^9 N/C) Calculate the overall electric field strength at point X due to...

I am in the fourth year of an MPhys and feel a PhD is the best way to further myself. I want to apply to groups that specialize in the theory and implementation of computational modelling. I would prefer this to be a group with a wide range across several branches of Physics as opposed to a...

I am unsure of this matter and so I am curious, do stronger metals more than likely have higher melting/heating points? Does a metal that takes more force/pressure to break or snap have a higher melting/heating point as well? Do metals/alloys like steel or titanium have higher melting points...

Hi, Four point charges of equal magnitude are held at the corners of a square. The length of each side of the square is 2a and the sign of the charges are the following: Two positive charges on the top two corners of the square and two negative charges on the bottom two corners of the square...

Homework Statement In the course of the above research, they discovered that this spider silk has an ultimate strength #or tensile strength of 1850mPa (see 11.4 in University Physics). Tensile stress is a measure of the pressure in an object when it is stretched. Tensile strength is the...

In the course of the above research, they discovered that this spider silk has an ultimate strength #or tensile strength of 1850mPa (see 11.4 in University Physics). Tensile stress is a measure of the pressure in an object when it is stretched. Tensile strength is the maximum tensile...

I have always loved math and have done independent theorem-proving and research. However, I have had absolutely no olympiad training but it seems that the math olympiad is quite important in applying to universities. I have started to do some of the questions myself and find that I progress...

hi, great forum. i have searched the internet for 2 days to figure out the following, but with no luck. question, i am going to remove my diesel engine which weighs 800lbs and bolt it to an engine stand. i will be using 4 hex bolts with dimensions, 3 1/4'' long, just over 1/2''...

Homework Statement How do I calculate the Field Strength if I know the Potential? Homework Equations E = -\nablaV V = Electric Potential E = Electric Field Strength The Attempt at a Solution There's a problem in which I calculated the Potential, it's constant however. So according...

I've recently attempted to calculate the force of repulsion between two neodymium magnets. The problems arise fairly early when I don't know how. I know about ampere's force law and all that, but I couldn't find an equation concerning permanent magnets. Obviously, two magnets with rectangular...

I'm looking at redesigning a hydraulic solenoid valve with the aim of reducing the package size. The solenoid coil is by far the largest component of the device, with about 4000 coils arrayed in about 90 layers stacked on top of each other. I'm wondering if I can reduce the size by removing some...

I am curious to know using scientific information what color lightsaber is the strongest? I have done some minor research and cannot figure it out on my own. I have come up with that violet produces the highest frequency while red produces the lowest frequency. Using Planck's Law E=hv I gather...

Does anyone have any empirically based equation for estimating torsional shear strength of a tube made from a given steel. I've seen "estimates" ranging from 57% UTS to 75% UTS, but nothing empirical. I'm open to anything based on UTS, a given offset strength, or JAEL yield. Thanks!

Homework Statement what is the gravitational field strength on the surface of a star that has a radius of 5.0 x 10^6km and a mass of 6.0 x 10^33 kg Homework Equations i tried the F=G MM/r^2 The Attempt at a Solution answer was rly weird and off

Homework Statement Two spacecraft carrying identical pendulum gravity meters have landed on Mars, one at the equator and one at the North pole. Over a fixed period of time the pendulum at the equator is observed to oscillate 250 times compared with 251 times at the pole. Calculate the...

Hello all, Thanks for potentially allowing me to waste your time with a simple question. I am designing a collapsible photo booth and need to know that the aluminum tubing I intend to use is durable/strong enough for both the repetitions of setup and teardown and the weight to be supported...

Background info: This is for a trebuchet I plan on building. Obviously lighter is better especially for the throwing arm which is why I need your help in figuring out that problem, so I can get it as light as possible without it having even a remote chance of failing. If there's information...

In stenger's book he claims that the ratio between gravity and the electro magnetic is not 1039 Let me know if you think he's right Note that N1 (ratio of EM force to gravity) is not a universal number; it depends on the charges and masses of the bodies you use in the calculation. For an...

I have tablet phone samsung galaxy tab... when I check the signal strength, it shows -82 dbm... I thought it is produced by the Signal PA (Power Amplifier) on the PCB... According to what I know, the signal from the handphone is so weak to reach the nearest terrestrial station on the...

What are the factors that determine the strength of an Ionic bond? Taking the example of LiF and K20, why does LiF have a stronger bond strength?

Problem: A +11 nC charge is located at the origin. Question: What is the strength of the electric field at the position x,y (-5cm, 5cm) ? I would think you would do this but when I try it I get the wrong answer for x-axis - E=k|q|/r2 For y-axis - E=k|q|/r2 Then \sqrt{}Ex^2 + Ey^2

I had a lab to do for Physics, and we used a variable voltage source and an electromagnet with 60 turns of copper wire. What is the equation to use to find the magnetic field strength B using relative permeability of a soft iron core? i cannot find this equation anywhere... plus, what is the...

Lattice Constant: 7.956A – 7.936A Density: 3.696 – 3.691 g/cc Form: Polycrystalline Melting Point: 2150°C Young's Modulus: 46.9x106 psi Shear Modulus: 18.9x106 psi Poisson's Ratio: 0.24 Hardness: 1850 Kg/mm2 (Knoop Indentation, 200g load) Fracture Toughness: 2.0 MPa-m1/2...

gravitational field strength problem-urgent help needed Homework Statement Moon has a radius of 1740km, Mass of 7.35 x10^ 22kg, grav field strength of moon= 1.62Nkg^-1, distance from Earth to Moon is 380000km G=6.67x10^-11Nm^2kg^-2 The Moon's gravitational pull on the Earth causes the...

Is a hydrogen on an ethanol more or less positive than on a water molecule. I think the hydrogen is more positive on a water molecule, but I still don't understand why? Could someone help me figure this out... please and thank you :wink:

I am trying to find an equation that tells the strength of a magnetic field a given distance away from the source. It would be very helpful if all terms are defined, since the internet is notorious for not saying what variables mean. Gracias

Moderator's note[/color]: A reminder to all to use common sense when duplicating others' intellectual property. XKCD, for example, requires some sort of attribution attached to postings of its comics; e.g. a link to the comic. (And, thankfully, XKCD does permit its images to be hotlinked)

Hello and thanks in advance for any help given. I have attached a drawing of sorts (please excuse the novice attempt) for a design I am working on to pivot a 40"x60"x1.5" item framed mirror) using an actuator. My question is specific to the part of the design marked "B" in red. Basically this...

Homework Statement A 14.2 cm - diameter circular loop of wire is placed with the plane of the loop parallel to the uniform magnetic field between the pole pieces of a large magnet. When 3.10 A flows in the coil, the torque on it is 0.135 m N. What is the magnetic field strength? 2...

What will fail if the aluminium impeller rotating at 7500 rpm and powered by 355 kw motor strikes against the stationary 10 mm thick ms plate welded at both the ends having length of 350 and width 200 mm and impeller blade is 12 mm thick. I am confused in first glance we think that blade will...

Hi, I've just completed a prac, where a beam was placed into a solenoid with a current flowing through it, causing a force to exerted down and I balanced out the force by placing weights on the other end in the effort of calculating the magnetic field strength. Anyway, one of the short answer...

Hi, I have some very basic question that I've been struggling to find the answer to and before I go and buy some magnets to do some test of my own I thought I'd ask here: Do two magnets of different strength repulse each other at the same strength, or does one repulse the other more...

Hi, I am a newby to all of this, can't find any good answers on the internet, hope someone with experience can help! If I have a solid steel pole with a length of 50 cm, hang this from a roof, and want to hang a 7 kg object from this pole, how thick does the pole have to be? If I reduce...

A bar of length 4m when used as simply supported beam and subjected to a uniform distribution load of 30kN/m over whole span, deflects 15 mm at the center. Determine the crippling loads when it is used as a column with following end conditions. a)both ends pin-jointed b)One end fixed and other...

OK well, this isn't a question as such, more a conceptual thing... The formula, B=(Weber)/(Area) gives the magnetic field strength, B in Tesla... . But when I rearrange in terms of magnetic flux, it's obviously (Tesla) X (Area). My question is, how is the flux (lines of force) defined by the...

Hi, There is clearly an analogous relationship between Yang-Mills theories and LQG, for example the covariant derivative, the field strength tensor, the field and its conjugate momentum etc... I am wondering how far this analogy extends. Specifically, is the Lagrangian for LQG the...

Homework Statement A medium carbon annealed steel rod has a rectangular cross section and must cope with a tension of 3 tonnes. The thickness of the rod is 15mm. Calculate the size of the cross section. Homework Equations ? The only formula I know with CSA and force is: stress = Force...

R at B = 5.0625 R at A = 8.5kN-5.0625kN=3.4375kN x/0.9375=(0.5-x)/4.5625 x=15/176 but moment near x there i get different from both side: from A = 2.431kNm from B = 2.346kNm is there something wrong?

Hello can someone please tell me the difference between stiffness and hardness and between strength and toughness? thanks

Homework Statement lectric fields of varying magnitudes are directed either inward or outward at right angles on the faces of a cube, as shown in the figure. What is the strength and direction of the field on the face F? (The cube does not contain any charges. Take EA = 13 N/C, EB = 26N/C...

Homework Statement You have a co-axial cylindrical capacitor placed in vacuum. The two co-axial cylinder tubes are made of copper. The outside tube radius a1 and inside tube radius a2, with overlapping length L; both tubes have a thickness of t. Say, the capacitor was designed to withstand 5...

I was looking at bolts strengths on this chart (bottom of page) http://www.derose.net/steve/resources/engtables/bolts.html#largebolts and saw that for a 1/4 unf the bolt shear was around 370 but the chart below it listed it at 2700. Why is that?