Strength Definition and 1000 Threads

So I have a motor and this motor will turn a screw and bring a platform down to expose fairings during rocket flight. The platform is connected to the fairings. Due to drag pushing the fairings down there will be an upwards force pushing the platform against the screw holding it down. The...

Homework Statement Hi. I'm pretty much a beginner in organic chemistry and I'm just wondering something. For example, I know that HCl is a stronger acid than HF. But... then why the following happens if a have an organic acid (e.g a carboxylic acid)? According to what I see, a...

Hi, I was wondering what the equation is to calculate theoretical fracture strength if you know the elastic modulus and flexural fracture stress? Homework Statement The flexural fracture stress for ordinary (i.e., soda-lime) glass is around 30–70 MPa. Based purely on the elastic...

Homework Statement σ=230MPa (tensile strength) E=15GPa (modulus) ρ=1.85 g/cm^3 (density) Homework Equations Strength/Weight = σ/ρ Modulus/Weight = E/ρ The Attempt at a Solution Strength/Weight = σ/ρ = 230x106 N/m2 / 1850 kg/m2 = 124324.32 (Units?)...

Hi all I'm trying to work out what the surface gravitational field strength of an irregularly shaped body would be (for example Mars' moon Phobos). I know that for a sphere, any point outside it can consider all the mass to be at a point inside it, but for something that's potato shaped, how...

Homework Statement Consider the objects X and Y, each of mass 8000kg and 2000m apart where XYP forms an equilateral triangle. Determine the resultant gravitational field strength at point P due to objects X and Y. Homework Equations G= GM/R^2 The Attempt at a Solution

hello! which factors determine, which parameters affect, the strength of an atomic interaction or bond? thanks!

√Homework Statement Carbon monoxide molecule, which has a reduced mass of 6.85 amu, absorbs infrared radiation wavelength of 4.6um. if the absorption is due to vibrational transitions, calculate the strength of the bond in molecule Homework Equations u=(m1*m2)/(m1+m2) The Attempt at...

Im on the verge of choosing my major and i have a quick question for everyone. Do you necessarily think that with passion comes strength in a certain field? I am positive that being good at something does not breed a passion for it, but what about vice versa? I recently discovered my...

I'm going to bolt some hooks to the inside walls of 20ft and 40ft shipping containers. What I'm wondering is, what would be the easiest way to determine the stress on the corrugated steel walls, excerted on it by placing things on these hooks?. The hooks are 280mm apart and the force will be...

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...

This concerns calculation of Rabi splitting of exciton polaritons when the exciton states are mixed but the mixing is known, i.e., the coefficients of the mixed states are known. I read from a thesis that the Rabi splitting is proportional to the square root of the oscillator strength. Is...

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...

calculation of internal thread tensile strength Hi All! I've got a coupling device that has two internal threads of different pitch, length, diameter. The smaller thread takes a lifting bolt, the larger attaches to a piece of machinery. I've been asked to work out the safe working load (SWL)...

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...

Question: IF x is A AND y is B THEN z is C where A=0.1/1 + 0.4/2 + 0.7/3 + 1.0/4 + 0.6/5 + 0.2/6 + 0.1/7 B=0.3/1 + 0.8/2 + 1.0/3 + 0.6/4 + 0.5/5 + 0.3/6 + 0.2/7 C=0.3/1 + 0.5/2 + 0.7/3 + 1.0/4 + 0.8/5 + 0.4/6 + 0.0/7 Find the fire strength and evaluate output z: a) for x which is a...

Hi everyone, I am trying to find out what the deflection would be for some steel U channel cold worked from sheet. U channel would be 2.250 in. (depth) x 1.0 in. (wide) x .040 (web thickness). Case (1) Supported at both ends. Length 50 in. Load 72 lbs. evenly distributed. Case (2) Same as...

I'm attempting to repair a glass aquarium. Here is a drawing I made when I ordered it originally, the top brace has developed 2 small cracks. So I'd like to empty the tank, then remove the old brace, and replace it. But I'm trying to figure out what dimensions I need the new piece to be...

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...