Dynamic Definition and 432 Threads

[SIZE="4"]Circle Rolling around Rolling Circle (1) Circle 1 rolls around inside of the fixed base circle. Circle 2 rolls around inside of Circle 1.

Homework Statement Determine the power of a windmill using constants where appropriate.Homework Equations P = Fv K = (1/2)mv2The Attempt at a Solution Dynamics Method P = Fv In time Δt, Δm amount of wind passes through the windmill, at speed of v. Δp = vΔm = v(AρΔx) Dividing both sides...

Please cana nyone physically explain the meaning of Guyan reduction for dynamic analysis? I have an ide that it relates to the erduction in the degreeso f freedom of the structure for FE analsysis such that the model is still accurate but performs (in relation to the time required for completing...

Hello, I am trying to do the following: for i=1:3 semilogy(plot1,'r(-,:,d)',plot2,'b(-,:,d)',plot3,'k(-,:,d)'); legend('i legend1','i legend2',''i legend1'') end where I need to draw the same plots under different settings, such that each function has the same color under the...

Okay, I have read all the threads on this site that I could find about Bernoulli's equation and blood pressure, but I am still really confused, and the more I think about it the more confused I get. I get that bernoulli's doesn't take frictional losses into account, but at a short section of...

This is a fundamental question but will be grateful if helped. Please can anyone explain the effect of damping on frequency? Whether, damping increases or decreases the frequency and why? An explanation with a physical interpretation will be gratefully appreciated. Vishal

Does anyone have any suggestions on existing technology to solve air dynamic issue for rocket? Thanks in advance for any suggesitons

In an air supply duct after the fan static pressure is maximal directly after the blades and is zero at the duct outlet, volume flow is minimal after the blades, maximal at the outlet. mass flow is equal at all points, speed of air constituents is minimal after the blades (where air is being...

Good afternoon, I've tried to find a simplified model for the dynamic forces acting on a rolling wheel, but have had very limited success. I'm looking for a force that is proportional (or related to) the rotational velocity of the wheel (rotational damping) because of the contact point of the...

Hi all I am trying to run an executable compiled from some Fortran files (not my own), which look like they are written in Fortran 77. One of these includes some dynamic space arrays, where the number of elements depends on an integer value passed to the subroutine, e.g. subroutine...

REWRITTEN: Well if you're interested I have a tank (actually a PVC tube with an end cap) that has an interior diameter of 86 mm. It stands on its circular face. Coming out near the bottom of the tank at a right angle is a metal pipe 11 mm in diameter (interior) and 312 mm long (in total that...

Hi all, I've created a structure containing various fields of data. The data in these fields is stored in matrices and is be added to at regular intervals. I'd like the system to identify the amount of inputs the fields already contain and then extend said matrices to include this new data...

hi i am new to fluent and i hav done few basic tutorials in fluent.But now i need to use dynamic meshing for my project so can anyone guide me how should i start to learn dynamic meshing. thanxxxxxxxxxxxxxx in advance

Homework Statement Assume a ball has mass "Me" and wrapped by water like ocean and Earth ,the water has mass "Mw" and density \rho ,when the ball spin with angular velocity \omega ,and the shade of system goes to ellipsoid, please expres the water depth in spherical coordinate system Homework...

Hi guys, I have a scissor linkage and I should calculate the force F for keeping the system in equilibrium in a specific position. The force must be applied in the the middle joint as you can see in the following picture: http://imageshack.us/photo/my-images/810/scissordisegno.png/ L...

I am intrigued by the idea of changing/dynamic transition probability matrix instead of the assumption of constant transition probability between states. For eg. Probability of population migrating between 2 states might not remain constant and can be a function of its population or some...

Dynamic pressure, from Bernoulli's principle, for a moving fluid with a given density is P = \frac{1}{2}\rho {v^2} On the other hand, we can compute the force on a plate hit by that fluid from the rate of momentum transfer. Assuming that the fluid exits sideways after impact, we have...

i heard that fluid dynamics and thermo dynamics are the hardest subjects in mechanical engineering and physics, can somebody elaborate on this issue ?

When I read some heat transfer book, I got a problem. There are some numerical calculation methods in dynamic heat conducting in tube wall, but all the methods assume the temperature on one side of the tube and then calculate the temperature distributed in the wall. But are there some methods...

Homework Statement The displacement from equilibrium caused by a wave on a string is given by y(x, t) = (−0.00217 m)sin[(44.4 m−1)x − (728 s−1)t]. i need to find (b) number of waves in 1 m waves (c) number of complete cycles in 1 s cycles (d) wavelength (e)...

Homework Statement http://img263.imageshack.us/img263/1961/carslide.jpg In a car whose mass (m) - 2250 kg, and drives in a velocity of 98 km/h, the driver activates the breaks and causes the four wheels to lock, and the sliding motion of a car through distance d, till decreasing the velocity...

To the EE Forum, I am a new guy on this Physics Forum and this is my first post. I have downloaded a free software code, Finite Element Method Magnetics (FEMM) solver (see http://www.femm.info/wiki/Download) but it doesn’t work because FEMM is limited to solving low frequency electromagnetic...

I have been looking into how the overall viscosity of a liquid/gas is related to kinematic and dynamic viscosities. I have used nwater = 1e-3 Pa.s nair = 17.4e-6 Pa.s densitywater = 1000 kgm^-3 densityair = 1.3 kgm^3 and kinematic viscosity v = n/density So vair ~ 1.4e-5 vwater ~...

Hi ! Sorry for a naive question from a biologist. I am making proteoliposomes within which a fluorescent probe, pyranine (lex = 455 nm, lem = 509 nm), has been trapped. I try to quality control my preparations using DLS (Dynapro, Proteinsolutions) and my concern is that whatever the...

(or "circular motion" problem) Okay, our lecturer pretty much has thrown us into cold water here. My big problem is getting the right list of formulas. I'm not sure this is a homework problems since I'm stuck in preliminary stages. Homework Statement...

Hi All, I am trying to get an analytical solution to a contact problem with dynamic loading. I am not sure if an analytical solution of such a problem is possible. Here how the problem is: A cantilever beam, with its free end resting on a smooth plane, is under harmonic loading f(t)...

Homework Statement A leg has a horizontal propulsive ground reaction force 200N and vertical ground reaction foce of 1200N applied to it. Draw a free body diagram. The leg has an acceleration of -4m/s2 in the x direction and 8m/s2 in the y direction. What are the horizontal + vertical...

hi colleages...is the equation below represent a dynamic equilibrium of vibrated beam-column member and simple boundary conditions? M(x,t)=Q(0,t)*x+integral{q(x,t)-mass*acceleration(x,t)}*(L-x)dx where M(x,t)= dynamic moment. Q(0,t)=shear at x=0. q(x,t)= external dynamic loading...

Hi guys, I'm a pure math master degree. Interested in studying dynamic systems, I want to learn more about this subject without any academic course.(just self study) How can I start it? Which books , articles and subjects?

Sometimes we need to calculate the evolution of the scalar field \phi with the equation of motion \frac{\partial^2 \phi}{\partial t^2}+3H\frac{\partial \phi}{\partial t}+m_\phi^2 \phi = 0. And we can get the field \phi=Ae^{im_\phi t} where A is the amplitude of the scalar field (damped by...

Hi everyone. I've been out of college for some time and forgot how to determine the shape of a droplet. I know how to determine the contact angle based on the interracial energies of three mediums, but I'm not sure how to calculate the actual shape of the hanging drop. In my scenario I have a...

Hello, I'm quite new to the concepts of quantum theory. So as such I have an interesting quandary. Keep in mind that I don't have as much back ground in study of physics as the lot of you but I will try my best to explain my dilemma. Given 1)Both the electron and nucleus have a charge and...

Problem Statement A 50cm by 30cm by 20cm block weighing 150N is to be moved at a constant velocity of .8 m/s on an inclined surface with a friction coefficient of 0.27. (a) Determine the force f that needs to be applied in the horizontal direction. (b) if a .4mm thick oil film with a dynamic...

Could someone please help? The question reads: For which real numbers "k" is the zero state a stable equilibrium of the dynamic system (vector(x))(t+1)=A(vector(x))(t)? A= [0.1 k ## 0.3 0.3] --> a 2 x 2 matrix with ## separating the two rows. So, my thought is I need to find the...

Hi all, (1.) Can someone tell me the difference between a compact valued and single valued correspondence? (2.) I have been seeing repeating themes of "continuity on a compact set". Does that imply boundedness and thus possible to attain maximum? (3.) What's the difference between...

Homework Statement Not sure why, but I opened an old textbook (Dynamics - Engineering Mechanics, Meriam, 1980) and started paging through. I decided to try this problem (attached jpg) and got stuck. The problem asks for the acceleration of the center of mass of the system of 4 weights...

A simple question, but I can't find the answer anywhere :redface: … when something (otherwise unconstrained) is pulled by rope (approximately forwards) so as to slide (not roll) at constant speed in a circle on a rough surface, the total acceleration is obviously centripetal (radial) there...

what is a the difference between a static and a dynamic impact?

Is there a valve that can be set to open to let hot gas out at a certain pressure, and then close once the pressure drops back down? Edit: Sorry, I'm looking for a valve that will let the pressure build up to a high point, then open to release the gas until the pressure is released, then close...

Please refer to this website: http://www.grc.nasa.gov/WWW/K-12/airplane/dynpress.html" In the "Simplify" step, where does the factor of 1/2 come from? I must be missing something simple... Thanks for the help!

I need some help estimating the heat transfer of a system. If I have an exposed length of pipe with a dynamic fluid moving at a constant volumetric rate through a very hot room, what equation is most appropriate to calculate the exit temperature of the fluid? Given: Initial temperature of...

hi colleages. is Bernoulli-Euler theory valid in the dynamic analysis as following: M/EI=1/R where, M= moment EI=stiffness R= curvature is this equation valid when M becomes a function of x and t, as follows: M(x,t)/EI=1/R

I'm starting a project involving a venturi and water, and for the venturi, I need the water pressure to be around 7-10 psi. This means for my water pump, the head height must be around 15-20 ft. Most pumps that fulfill this requirement are either too expensive or are too powerful for my...

I am about to talk to a prototype company and need some advice on O ring, friction and seals. I am creating a device that works on slight water pressure differential. I have a piston like structure that is cylindrical and there will be an o ring inside the cylinder. The gas/liquid that the o...

this function is supposed to find the first item in an array that is less than the element preceding it, and set the p parameter to point to that item, so the caller can know the location of that item. when i run it.. it fails. there are probably multiple bugs.. any suggestions on how to fix...

Homework Statement I'm trying to learn the dynamic system model, I was given the following problem to work with. Can someone give me a walk through of did I did right or wrong? Situation: A conservationist is studying a colony of endangered variable oyster-catchers. Birds that are chicks...

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Hi, 1. I am studying dynamic light scattering in which one experimentally measures intensity correlation i.e., <I(t)I(t+tau)>. Therefore, if the detector looks at a scattering signal from a solution of particles undergoing Brownian motion, under right experimental conditions one can detect the...

i posted it in general physics and got not answer. maybe this is the right place for this. thanks here is a question for max dynamic factor for sinusoidal load F*sin(at). say the natural frequency is b for a mass. then the max DLF considering damping is DLF=1/(1-(a/b)^2) when a>>b...

A motor vehicle has a mass of 700Kg and is traveling at 36 km/h on a level road; it is taken out of gear and allowed to roll to a stop. The first part of the question asks me to work out the kinetic energy which I've done and then the next part asks how far will it travel if the rolling...