Strength Definition and 1000 Threads

Homework Statement I'm pretty sure I have done questions 1 to 4 correctly, it is just question 5 I am struggling with. I have an exam in one week and this is revision so it will not get marked by a tutor, and it would really help if someone could give my answers a quick check and help me...

I'm somewhere at a suburb near Sydney and I have problems designing an experiment to measure the strength of the Earth magnetic field so that means now I'm close to geographic south and I'm close to magnetic north right? how do I measure the angles between the GS and Mn and what do I have to...

I'm currently designing an observation deck as a project. We have to consider a strong, light and cheap material that will hold 15<x<25kg. I considered bamboo, any other ideas?

Hi guys, I have an electric motor that comes with a flange to be bolted on a plate horizontally so that the 4 screws carry the weight of the motor and the momentum it creates on them. Could you direct me to how to calculate if the given screws and nuts stand up to the load? Perhaps an example...

Homework Statement A 6.2*10^2-kg satellite above Earth's surface experiences a gravitational field strength of magnitude 4.5-N/kg. Knowing the gravitational field strength at Earth's surface and Earth's radius, how far above Earth's surface is the satellite? (Use ratio and proportion.)...

I am wondering if anyone would be so kind as to help me with a project. I am wondering what size aluminum square tubing it would take to build a "T" with the horizontal top being 4 feet in length and being able to hold 250 lbs. at each end and 1 ft. in from each end, totalling 1,000 lbs. I...

How strong must the magnetic field be to attract an magnetic item from 1 meter plus?

Hello Gurus, I am new to mechanical design calculations. Since I have came across one interesting fact there are two methods using for finding the shear capacity of the components. Yield Strength and Ultimate strength. Shear yeild strength=1/√3* Yield strength Ultimate shear strength=...

Three charges are located on a coordinate plane scaled off in meters. Charge #1 is 5 nC and located at (0,0). Charge #2 is -3.0 nC and located at (0,-.10). Charge #3 is 6.0 nC and is located at (-3,0). a) What is the net force (magnitude and direction) on the charge at the origin? b) What is...

So is the strength of gravity proportional to the speed of acceleration of gravity? So would an object with 2g of gravity have a 19.62 m/s^2 acceleration? I am sure this sounds like a stupid question

News reports have it at 4.9 magnitude and a depth of 1 kilometer The USGS appears to have it at 5.1 and the depth is not currently known accurately. http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/usc000f5t0.php#details...

Homework Statement Two 2.0cm diameter disks face each other, 1.0mm apart. They are charged to -10nC and 10nC. -What is the field strength between the disks? -A proton is shot from the negative disk toward the positive disk. What launch speed must the proton have to just barely reach...

Greetings to all, I know activity for a Am-Be neutron source. I want to compute strenght source in neutrons/s. Yours advices are welcome. Thank you!

Homework Statement What are the strength and direction of the electric field at the position indicated by the dot in the figure? Answer in component form. Homework Equations E=kQ/r^2 The Attempt at a Solution E(+5) = (8.99E9)(5E-9)/(0.02^2) = (1.1E5i, 0j) E(-5) =...

hi all, i have just signed up to this site to find some assistance with the above topic. i am building an electromagnetic propagator to study the effects of varying field strengths on the germination of seeds and the rooting of cuttings. it has been many years since i last look into...

Homework Statement What is the strength of the gravitational field on the ground just above the oil deposit? Hint: Consider the missing mass as a sphere with a negative mass. Given: a spherical oil deposit with radius 200m at a centre of depth 2.0km. The density of the Earth's crust is 2700...

Consider a cantilever beam of rectangular cross section made up of two materials steel and aluminium. an axial force is applied at one end. the question asked was which material should make up the upper part and which should make up the lower part of the beam? Could someone please help me in...

kevlar has the greatest tensile strength(yield strength here) in all materials at 3620 MPa , am i correct? and i want to know which material has the least tensile strength(yield strngth)..

I’m designing and hope to build a human powered helicopter (HPH) and am wondering if pressurising a thin walled aluminium tube by filling it with compressed air would strengthen it’s structural properties. Hope this is the right place to post this.

Homework Statement A mass at a point X gives rise to a gravitational field strength g at point P as shown. An identical mass is placed at point Y x ________ p ______________________ y The resultant g f s is now? Homework Equations g = Gm/r2 The Attempt at a Solution...

When water freezes to ice, it becomes so strong that we can move over it. This freezing takes place of bonding between water molecules, the mass of water being the same. 1. Does it mean that we are virtually walking on forces? 2. Does it mean that forces are more important than mass...

Which is more acidic H2S or H2O?And why?

Are those the same? if not, how do I calculate the initial yield stress from the tensile strength? all the materials properties I see on the web only specify tensile strength, and I need the initial yield stress as an input on non-linear FEA analysis. Is it possible to extract the initial yield...

Homework Statement Homework Equations force = current * length * field strength * sin (theta) current = 5.6 A mass/ length = 80g/m right angles = sin(90) = 1 The Attempt at a Solution i noticed the mass is given in grams, 80 grams to be exact or .08 kg . how would I find the...

Homework Statement Homework Equations Force = Current * Length * Field Strength * sin(theta) (Force/ Length)/(Current * sin theta) = Field Strength The Attempt at a Solution (.28 N/m)/ (14 A * sin 27 degree) = .044 T or 44mT

As my knowledge of an electric field strength becomes more precise, what physical quantity becomes correspondingly less precisely known?

Homework Statement Three positive charges, A, B and C, of 3 × 10-6, 2 × 10-6, and 3 × 10-6 Coulombs respectively, are located at the corners of an equilateral triangle of side 0.2 meters. Find the magnitude in Newtons/Coulomb of the electric field at the center of the triangle...

Hi I'm a high school student and need help with the calculations for a bike design. I am required for the design to use 1.5" mild steel square tubing at 1/16" thick for it. I need to know what the strength of the tubing is before i can make or tweak the design. Can anyone help with my predicament?

Hi, I am trying to find out if permissible stress and tensile are the same.If not,what is their relation?Thank you.

Hi.Who can explain to me oscillator strength?

Which one of the following weighs less when weighted in magnetic field? A>SnCl3 B>FeCl3 C>TiCl3 D>VCl3 This is the question I encountered in my Chemistry Olympiad. While I went with B, my institute published answer as A. What I deduced is that A is diamagnetic while the rest are...

I am designing a mating male and female threaded interface, where the nut is much weaker than the male thread. I need to be able to calculate a few things: A. The maximum force (as preload) required to reach the yield point of the nut material. B. The torque required to achieve the above. The...

I have to assess the sizing of a spindle of a DN600 Knife gate valve. The spindle is subjected to two sources of loading acting in both shear and tensile. •Torque applied to the spindle. •Resulting thrust from line pressure. Known data: Required thrust at 2 bar line pressure: F = 53.2 kN...

Homework Statement Given Radius is 4.76*10^5 m Astronaut drops a hammer of 0.85kg from a height of 1.25m. It takes 3s to reach the ground What is the gravitational field strength? Homework Equations The Attempt at a Solution g=a=Δv/t v=d/t v=1.25/3 a=1.25/3/3 But that's...

Alice is transmitting an electromagnetic beam to Bob. Assume it is a well collimated beam, like a laser beam, or a maser beam. As Bob's distance from Alice increases, his signal strength decreases according to the well known inverse square law. Eve, the eavesdropper, is beside the beam, not...

Hi Wasn't sure where to post this, hope it's ok in here! I've gotten myself very confused as to how to find the minimum yield strength for an element. I have used Mohrs circle to find sigma1 and sigma2, then plugged that into the von mises equation to find sigma-von = 636.8MPa. The...

The electric field strength inside a conducting charged sphere is zero, but why? In the book it says "that the field lines would link charges of opposite sign in the sphere and such a state of affairs is impossible under static conditions in a conductor." I don't really get this sentence. And...

Hi, these are questions from my exam from the mechanical behavior of materials. I seriously screwed the exam up. Can you guys help me out? a) Provide two reasons why C is more effective than Ni in strenghtening Fe. b) Explain why single crystalline alloys with fine grains are more...

Hey there, I am currently working on a project to compare the compression strength of chocolates with different inside filling (caramel, nuts, coconut). I came up with the hypothesis that chocolates filled with nuts would require the most force to break while chocolates with coconut the least...

In case FEA we consider ultimate tensile strength to decide whether component will fail OR pass why ultimate tensile strength is lesser than youngs modulus? Example for copper UTS is 245 MPa n youngs moduls 131000MPa. Why it is like this? Regards, Amlesh

not sure if I am in the right place or not but nevertheless need some help I am trying to figure the correct steel to use for sign support. I am trying to determine if a 5 x 5 inch with .25 wall is as strong or stronger than a 6 x inch tube with a 3/16 wall. Can't find any formulas to help...

Homework Statement A satellite orbites Earth at a distance of 3rEARTH, above Earth's surface. What is the magnitude of gravitational field strength at the point where the satellite is?Homework Equations Fg= Gm1m2/d^2 (m1=mass 1, m2=mass2) F1/F2 = D2^2/D2^2 (D1 is a variable, and so is D2, so...

Hi, Using the formula g = \frac{GM}{r2} I found 'g' to equal (9.792121683 x 106 \frac{N}{kg}) The value of g is 9.8 \frac{N}{kg}. I am wondering if I made an error in my calculations or if there is a method of simplifying to get 9.8. Thanks,

Homework Statement QUESTION 2 (Total 20 marks) Figure 4 below shows a diagrammatic section of the floor of a typical house suspended over a garage. The steel beam shown in section spans 7.2 metres centre to centre of supports. The floor, including an allowance for the self weight of...

Hello All. I am getting my @$$ kicked by what seems to be a simple concept, and I hope someone can offer me a little help. With some of the nickel based super-alloys such as what are used in turbine blades, why do the alloys get stronger as they get hotter? It seems counter-intuitive to me...

Help me clear up something. I know the magnetic field of an electromagnet's core is given by , where N is the number of turns of wire. Now, the resistance of the wire is given by R = ρ*λ/A, where ρ is the resistivity, and λ the length of the wire. Using Ohm's law to combine them, I get: But...

Hey guys, I recently did a compression lab with different materials (wood and pvc pipe) and I have to plot the stress/strain curves given the data collected, as well as find yield strength (0.2% offset), ultimate compressive strength, and modulus of elasticity. I've already calculated...

Does anyone know of any good materials to make pipe out of that can withstand around 200 psig, 250 F and is completely non conductive? Would also be nice if it was durable to external bumps and drops as well. Was thinking carbon fiber but that won't handle high temperature.

I have used two different Gauss meters to measure the same NdFeB rare Earth N45 (45 MGOe) disc magnet (D28X6mm), with a Residual Induction (Br) of 1320-1380 mT. The first is a Dr. Steingroever GmbH FH51 Gauss meter. It would take readings of up to approximately 1.2 Tesla (12,000 Gauss)...

This is not a specific question. it's just common sense. all temp values in celsius. The impact values of polymers are definitely astonishing when i think at the molecular level it is said that increasing the molecular weight of the chains increase the impact strength. consider same...