Application Definition and 945 Threads

Homework Statement A hemispherical dome has a diameter of 100m. A search light was placed at point A as shown at the middle of the dome at B. A balloon was released vertically at a velocity of 4m/s. How fast will the shadow of the balloon move alone the roof if it traveled 25 m vertically...

Hi, Im currently working on a project to design a hybrid pulse-je/rocket motor for space applications. The Pulse jet is to lift a payload in the Earth's atmosphere then reverts to a rocket motor in space. The idea is to reduce the use of on-board oxygen during ascent since it initially...

Homework Statement A rocket burning it's onboard fuel while moving through space has a velocity v(t) and mass m(t) at time t. If the exhaust gasses escape with velocity ve relative to the rocket , it can be deduced from Newton's Second Law of Motion that...

Hey all, recently found this site about ball bearings and have a question: http://www.mcmaster.com/#standard-ball-and-roller-bearings/=ecllbn I have an application that will have a gear sit on top of the ball bearing as it spins (the weight won't be too large, don't want it to be), what...

Anyone knows how to get admission in MIT ??

I've just begun my 2nd year of study at my University and as part of a program requirement, must take a Liner Algebra course. I love mathematics, but I have never experienced much of Linear Algebra. I was just wondering how Linear Algebra applies to Physics, what branches, etc.

Homework Statement Two weights are hanging by the following cables, A, B, C. 1. Find the tension in Cable A. 2. Find the tension in Cables B and C. -----ceiling---------- \ 60) (60 / \ / \ / B \ / C \ / \ / [_]...

I'm a third year physics student interested in grad school. My marks are ok (85% average), and I should be able to get a letter of reference for grad school based on a 4th year Honours project. How important is a summer research position to a grad school application? I can probably get a...

Please teach me this: I hear that linear sigma model has application in pion,nuclear physics.But do not understand what is the application of nonlinear sigma model in QFT? Thank you very much in advance.

Let {xn}n = 1\infty be a bounded sequence and {xnj} be a convergent subsequence, each one converging to L. Want to show that {xn[}[/itex]n = 1\infty converges to L. My proof is as follows. Suppose that {xn}n = 1\infty does not converge to L; this implies that there is a...

A 5C point charge located at (2m, 3m, 4m) and a 6C point charge located at (4m, 3m, 2m) together exert a net force on a 7C point charge located at (2m, 4m, 3m) is most closely represented by... (a) k(-6i + 15j - 10k) N (b) k(-8i + 13j - 12k) N (c) k(7i + 14j - 11k) N (d) k(7i - 14j - 11k)...

are there any places (hopefully online since it'll be easier for me), where I can read examples of good UC application essays? (not just any essay, but essays that are picked as well written and posted public as an example). There're probably lot of essays out there, but it does not mention(in...

A 1450 kg submarine rises straight up toward the surface. Seawater exerts both an upward buoyant force of 16,140 N on the submarine and a downward resistive force of 1030 N.My question: Is the weight of the submarine included in the net force? If the weight is taken into account, is it included...

Homework Statement The stopping distance of a 0.40 kg weight which slides into a spring with k = 750 N/m at a speed of 1/2 m/s is 0.012 metres. Can we now calculate the original uncompressed length of the spring from this info? The Attempt at a Solution m = 0.4kg k = 750N/m v =...

Homework Statement An arctic hunter goes hunting polar bears and shoots one. He finds it lying dead on a large patch of almost frictionless ice. He has no scales or weighing device of any kind (and of course, there's nothing to hang it on) but he does have a long rope. How can he get a pretty...

Homework Statement My dad is driving coal. His truck has a limited coal-capacity, and enough fuel. He drives this coal from the central which has enough coal, to farmers that need different amounts. As there are many farmers, he has to drive back and forth several times. He knows all...

Is it possible to use a piezoelectric transformer to step up voltages of 3 to 12 volts to as much as 5 kilovolts? Below are more details of what I would like to do: Input into transformer: square waves, 0 to 12-volt amplitude with frequency range of 100 Hz to 100 KHz Output from transformer...

I start to learn about matrices and their algebra, but I am wondering what physical application they have. I know that matrices have application in optics, which is called “Matrix Optics”, but do they have other applications? Can you give different and real physical examples with matrix algebra...

I am your regular White guy and a Texan for 6 generations. The PhD application form asks for your place of birth. Now I was actually born in Mexico but soon after I was born, my mother married a guy from Romania and moved to Romania. He wanted to immigrate to the US, so he registered...

Greetings everyone, I'm constructing a ferrofluid display cell using FerroTech EFH1 ferrofluid inside of a round bottom pyrex beaker. The ferrofluid is oil based, so it is not hydrophilic. The liquid that the ferrofluid will be suspended in is Magnesium Citrate (a household laxative... and no...

1. The Ministry of Health has determined that t day after the detection of a communicable disease, the percent P of a city’s population that will be affected is given by the equation P (t) = 10te^-0.1t 1 ≤ t ≥ 15. How many days after detection will the maximum percent of the population are...

Homework Statement The apparatus below shows an experiment to investigate the speed of reaction between lithium and water. A piece of lithium is wrapped in steel gauze and placed in a beaker of ]water. The volume of gas collected in the measuring cylinder is measured at 10s time interval...

I have this example from my physics books which says: If a skater pushes against the wall and the skater moves, the wall does no work and the motion of the skater only results from the internal work of the skater. It also says that the wall does no work because there is no motion of its point...

Hi there, I joined specifically to ask for help in exploring the possibility of harvesting the waste heat from a cars engine and recycling this energy to improve the engines efficiency. I'm assuming most people know about thermo dynamics, internal combustion and volumetric efficiency I:-p...

Homework Statement I have proven in two ways (correctly) that the derivative of ln|x| = 1/x (note absolute value does vanish) Now I open my textbook and see a general rule that \frac{d}{dx} ln (u) = \frac{u'}{u} And the not so general derivative of |x| is \frac{d}{dx} |x| =...

I am looking forward to design vent silencer , which shall be temporarly connected to the 48'' pipeline for depressurising activites during gas pipeline pre comminissioning ativites. Dry air shall be injected into pipeline which shall proppel the pigs and move the water infort of the pigs for...

I've asked a few question here pertaining to an ongoing bit of writing in the fictional genres, and this is another. Given the fictional nature, two things I DON'T need are: People thinking this is a serious question about real-world applications. The assumption that, "just write what you...

Homework Statement Two forces act on an object. The angle between them is 50°. One force is 150 N. The resultant force is 200 N. Find the second force and the angle that makes it resultant. Use Cartesian vector methods to solve your problem. Homework Equations The Attempt at a...

I recently learned that Kramers-Kronig relations can be applied to physical response functions, but I find it strange that for eg. the refractive index and absorption of a material cannot be independently defined, what is the explanation behind this from the point of view of the physics...

Struggling to apply Burnside's Lemma to an example for the Dihedral group (3) i.e We colour the vertices of an equilateral triangle with three colours: red, blue, green. We do not distinguish colourings if they can be obtained from each other by rotations or reflections. Use Burnside’s...

Homework Statement I'm trying to get familiar with how to use the CKM matrix when tackling such questions as "which of these two decays is more likely". My example question is: Which is more likely c\bar{d} ---> s\bar{d} or c\bar{d} ---> d\bar{d} Homework Equations The...

Homework Statement Assume that the drug administered intravenously so the concentration of drug in the bloodstream jumps almost immediately to its highest level. The concentration of the drug decays exponentially. A doctor prescribes a 240 milligram (mg), pain-reducing drug to a patient who...

Hi, :smile: Almost all the details you will find in the given link below: http://img710.imageshack.us/img710/1565/exampleproblemnodalysis.jpg You will find the expected (or, target answers) in the top right corner. As you can see my value for V1 is utterly wrong. It should have been...

Suppose I have a particle of mass m in a uniform, downward gravitational field g, constrained to move on a frictionless parabola y = x^2 I get L = KE - PE = \frac {1}{2} m (\dot x^2 + \dot y^2) - mgy = \frac {1}{2}m \dot x^2 (1+4x^2) - mgx^2 \frac {\partial L}{\partial...

Homework Statement solve integral x^3/(e^x-1) with limits from 0 to infinity Homework Equations The Attempt at a Solution i tried using a rectangular contour,the boundaries of the contour pass through z=0 but the complex equivalent has pole at z=0. by Cauchy theorem the function...

I need an algorithm for developing a calculator application. When I googled , I got results that perform the ordinary push and pop operations . I need the complete algorithm that can be useful to code a calculator application in GUI.

hi, so I'm just finishing up my junior year and would like to try to go to grad school for math. I got into an REU program this summer that ends around the beginning of August and plan to start studying for the GRE sometime during the summer. Right now though, I'm a little confused as to how I...

Hi All, I am hoping to create an equation which I can use to describe the thermodynamic properties of microhabitats used by Chuckwalla lizards. Basically,the habitat in question is a crevice that is shaped like a rectangular prism within an igneous rock. I am trying to develop an equation that...

Please teach me this: Which interaction is the result of linear sigma model.Please teach me what purpose the linear sigma model implies? Thank you very much in advanced.

Homework Statement Three forces are applied to a square plate of side a. The point of application (on side BC) of the resultant force is ? The Attempt at a Solution Resultant force acts along AC with magnitude 2F. How to find the point of application that too on a given side?

We are doing mass spring problems that stem from second order ODE's. I think my lack of linear algebra is hurting me once again in this section so any help would be greatly appreciated. We are using a stiffness matrix of K = [ -(k1+k2), k2 (row 2) k2, -(k2+k3)] Our first problem has the...

Assignment: Write a client and server, Java Swing application using socket connections that allows the client to specify a filename to the server in a Textfield and the server send the contents of the text file back to the client if it exists. If the file does not exist, then it should send...

So I learned way back in economics 101, that when it's more profitable to produce/provide service A rather than B, more people will jump on the A band wagon, until the supply of A increases to the point that the price of A is no longer greater than B. Why does this not apply for medicine? Is...

AdS/CFT has primarily focused on quark-gluon plasma, but I notice some people are trying to apply the idea to bound states such as baryons. How much progress has been made in this field? Is it possible for AdS/CFT to shed light on problems such as parton distribution functions and proton spin...

Hello everyone, I am new to this thread and had a couple of questions regarding the use of ANSYS in dentistry. Just a little bit about myself to put my question in context. I am a graduate student and am completing a research project on bone regeneration using a certain protein. I am basing...

When applying to graduate school in physics, how much weight does your undergrad institution carry in your application? I ask because I currently attend a school in the lower rungs of the top 50 and the graduate schools I am interested in attending are highly regarded as being much, much better...

]How can H.U.P be used to explain the following : (i) The non-existence of the electron in the nucleus. (ii) The existence of protons, neutrons and alpha particle. (iii) The existence of finite zero point energy. (iV) The binding energy of an electron in an Hydrogen atom is of the order of 15...

I hope to apply for a Ph.D. place in 2012; is it possible to send off written papers [as if to write extended articles] as part of the application, to demonstrate competence? I am worried that otherwise the grades for the various modules of my Physics degree that won't end up as my intended...

Say I have to consider a situation like this: Say there are tensions (all the same) on each one and forces of gravity (different) on each one. Would the coordinate system there apply to each one in reference to their forces? In other words for the first mass, would Fnet = T - Fg1? For...

Hi there, needing some help with a torsion spring application...I'm looking to use a torsion spring to load a carousel (which is about 400mm diameter, 100mm height and weighs about 2.5-3Kg) so someone will turn this carousel (onto a base) which will load the torsion spring...the spring will be...