Dynamic Definition and 432 Threads

Homework Statement http://i450.photobucket.com/albums/qq230/JJBladester/06_p51.jpg?t=1223753179 The 2.0kg wood box in the figure slides down a vertical wood wall while you push on it at a 45 degree angle. What magnitude of force should you apply to cause the box to slide down at a constant...

Hey guys, I'm trying to design a reciprocating pump engine with a dynamic stroke length. basically something like this: http://www.animatedsoftware.com/pics/pumps/animpist.gif" However I wish the stroke length to be variable and dynamic. The only way I have found so far is the change...

Homework Statement A man is walking in a straight line in a constant speed V. All variables are known. Since the speed in constant, the net force is zero. But aside from the static friction which is allowing him to move forward, what other force is present (in the direction of the movement)...

Hi all, (see the attached images) working on a dynamics project about the suspension system in a bike, we have been given a 4 bar linkage - dynamic system, and I am trying to find the velocity of POINT C and POINT F, but given in terms of the angular velocity of bar AB in the STATIC...

If a material has a higher permeability (electromagnetism) than another when in the presence of a fixed H field, would it generally also have a higher permeability when in the presence of a changing H field?

Do you know an ebook about the dynamic analysis of a bar mechanism?Thank you.

Heads up! Really cool! :cool: I hope they do both the aircraft and submarine on Titan and Europa. Talk about a design challenge.

My fluid dynamics is rather weak and i was wondering if someone could please tell me how to calculate dynamic head of the flow in the a tube and how to calculate pressure drop of a hole in a tube? Some formulas would be handy thanks engineering

What is the difference between figuring out the force of tension in the string using the static and the dynamic method?? We did a lab where a toy pig was hung from the ceiling with a string and when we turned the pig on the wings moved and traveled in a circle... In the dynamic case, we just...

Shortest path on dynamic "graph" Suppose you have n objects orbiting Earth with velocities v1, ..., vn. Starting from t=0, the objects are at positions x1,..., xn; how do you calculate at what point they will be at a state such that the shortest path (arcs of great cirlces) connecting all of...

To brake a 3ph DC, the best I've come up with, apparently, is to place a pair of power FETS, back-to-back across each pair of leads. I would like to manage a hard short without additional load beyond the motor winding resistance, then duty cycle to get controlled braking. As far as having...

How to calculate the dynamic viscosity of air at high alttitudes,i want to calculate it at hight 4000m abovesea level at that hight the temp. is 262 kelven degrees. Any thoughts?

Dear All, I need your help with a present problem - I am a student pilot, and want to see the derivation for the dynamic pressure formula - which is 1/2PV^2 where P - Density, V-Velocity I was asked an interesting question by my a fellow student: Why is dynamic pressure directly...

i'm not even sure where to get started with this one because the thorton and marion classical dynamics book is really awful. BEGIN PROBLEM Suppose a baseball, which has a mass of 150 g and a diameter D of 7 cm is released from rest. For a sphere in air, the dynamic drag is F_d=.25 D^2 V^2...

Hello all, How would I calculate the pressure exerted on a surface by an engine in a vacuum, for example, if a lander was landing on Mars, I'm trying to calculate the pressure exerted on the surface by the exhaust. Should I simply be looking at P=F/A or should I be looking at dynamic...

[SOLVED] dynamic systems I Have Just Received This Question = A Car Of Mass 1.2 Tonnes Rolls Down A Hill Which Is 600m Long And Is Inclined At An Angle Of 9 Degrees To The Horizontal. Ignoring The Effects Of Air Resistance And Friction And Assuming The Car To Start From Rest At The Top Of The...

It's been a looooooong time since I delved into fluid properties. I'm trying to predict flow based on a known static head. I have a water column which will result in 6 psig of static head. The height of the water column will not change during the flow. I know the downstream piping will...

http://www.filefreak.com/pfiles/38439/physics.JPG I don't understand how to dop 4 and 5 Can the moderator or anyone message me back like i was a away for school for 2 weeks like i couldn't get out of bed n i messed a lot of classes and i have a quiz based on these questions

http://www.filefreak.com/pfiles/38439/physics.JPG need help on question 3 and 4 I don't understand what to do for those question can anyone show me an message below

If the force I need to apply to a block before it starts moving is 10N, and the same force of 10N is continually applied thereafter, will the block accelerate or travel at constant speed (taking into consideration the presence of static and dynamic forces of friction) and why?

Hi all, I would like to know whether my approach of solving for the direction vector of a refracted ray is correct. 1. Problem statement A ray of light is incident on an interface of two mediums. The incident ray has a unit direction vector v. i and r are the incident and refracted angles...

The acceleration of a particle along an x-axis is a = 5.0t, with t in seconds and a in meters per second squared. At t = 2.0 s, its velocity is +13 m/s. What is its velocity at t = 6.5 s? I don't really know how to go about this, as it is a dynamic acceleration, any help would be...

I have to do a presentation about the Brownian dynamic. could you help me? I need information about the Brownian motion and dynamic. Thanks

Hey, I have this theory about static and dynamic pressure generated by a propeller, but I might be wrong, so I could use some comments on this. Its kinda long and whiney, but well.. here goes; Lets say I have a motor with propeller, spinning at a certain rpm. -In the first scenario, I put the...

Hi, I'm developing a feedback control system which explicitly comprises a model of the dynamic plant (inc. actuators). Any thoughts on programming methods I can use to describe the dynamic system which should provide valid results for a given input (step, ramp, impulse) in both time and...

Homework Statement we want to move an object with mass m=100kg which is still on a rough surface with a force F=800N. between the surface and the object there's a \mu_s=1. Prove that the object can be moved if the force is applied with a 30° angle with the surface. Homework Equations...

an object with mass m=0.1kg is thrown with an initial velocity v0=20m/s in a viscous matter that exercises a resistant force of F=-Bv (B=2kg/s and v=velocity). ignoring the gravity force, find the distance covered by the object in the viscous medium. I tried this F=-Bv=ma => a=(-Bv)/m...

Homework Statement An object with mass m=0.1 kg is thrown with an initial speed v0=20m/s in a viscous matter which opposes its motus with a resistance force of F=-Bv (v is the speed and B=2kg/s). Find the distance this object has covered in the viscous matter. Leave aside gravity force...

3 Dynamic Physics Questions Urgent Help Needed! Homework Statement Problem1 An object of 6kg is moving towards the south. The resulting force that the object has is 12 Newtons towards the north. What is the acceleration of the object? Homework Equations f=ma fg=mg The Attempt...

I am having trouble relating the two quantities of dynamics and static pressure in: 1/2p*v^2 + p = constant, bernoullis equation, to corresponding physical descriptions. In what way do the air molecules act to create both dynamic and static pressure, respectivley? As far as i know, dynamic...

Hi! If there are two operators A and B, which commute, what are the consequences of that to the measurement of the corresponding dynamic quantities?

please help me! there are three research homework.and ı don't find anything.these are; 1)what are the methods of shrinkage of grain boundaries? 2)in some situatıon,at recovery region,hardness increases.why? 3)what is dinamic recrystallization and what does effect dinamic...

I have really big prob., please. anyone who know how to do this i'll be very pleased. My Homewok is little problem.We work Dynamic systems and then we test that system on computer ( on Mathlab).I attached you my prob. you and I'll translete you upper text: Two equal bars AiBi length...

Can anyone explain what stroketlet and rotlet physically mean? Also, I find two forms of strokes equation in different literature, one with the partial derivative of velocity w.r.t. time while another did not, so which is the correct one? Or they refers to different scenario? I am very...

I understand that physicists distinguish between the static and the dynamic properties of a subatomic particle; where static properties are those that retain definite values in between measurements (eg the electric charge on an electron) and dynamic properties are those that do not retain...

Hello , I am a 4th year ME ,I have as an Final year project to do a dynamic mesh analysis for the blades of a wind turbine ! unfortunately , i don't know how to start since it is the first time I work with the Dynamic mesh . I practiced ont he Fluent softwares when I took the CFd course, so i...

i think E=mc^2 and E=hv so dynamic mass of photon is m=hv/c^2 ??

I want to be able to generate pages from a database but the data only changes occasionally. It'd be more efficient to have the pages served up from flat HTML most of the time and only have to "publish" to HTML when I make a change to the database. Is there a really convenient way of doing...

My next thread is about the Quantum Vacuum -- this idea that the vacuum is actually a player/participant in the behavior exhibited by objects, particularly smaller ones. So suppose we then take all the random/imprecise behavior shown by particles, and "outsource" these to the vacuum itself...

Homework Statement Two blocks of mass m1=3kg and m2=5kg are linked by a cord passing through a pulley of radius R=8cm and of mass M=4kg. We neglect friction and we assimilate the pulley to a disk. We place the origin at the center of the pulley. a) what is the total torque on the system...

I'm playing devil's advocate here I want to explore ramifications. According to GR, geometry is dynamic. In string theory, 6-7 dimensions are compactified as a Yau-Calibi manifold. The properties of elementary particles depend on the topology of these manifolds. Presumably any gravitational...

well this problem is killing me and I've spent a good 3 hours or so on it and still have no real results. This is the problem The 4.00-kg block in the figure View Figure is attached to a vertical rod by means of two strings. When the system rotates about the axis of the rod, the strings...

to get the absolute pressure of a fluid you would take the static pressure and add it to the dynamic pressure. And you would have the total pressure. If that total pressure let's say 10psi static pressure and 5 psi dynamic pressure, gave a total of 15psi. So if you had 15 psi flowing through a...

i'm stuck on a problem. Let's say you have a large water tower. and the pressure is basically static pressure from the weight of the water. But when the water starts moving through pipes is the pressure then dynamic pressure? In which would you have to calculate the pressure from 1/2 density of...

I don't even know how to phrase this, let alone which forum it should go in. I'm trying to design a valve, like in a blood vessel. I want to ensure that the design "works" i.e. the shape of the valve will be determined by the volume of fluid moving through it. So, what shape will it take over...

Op. amp tuned to "dynamic range"? You'll have to excuse me if this is a silly question, but I'm self taught in electrical engineering practices, and there are some simple things I've missed. Here is what I am trying to do(hypothetically): I have a sensor/ transducer that has a ratiometric...

If anyone has omnigraph, download the ogr file from this site: Then fast forward the dynamic constant.

A house has x meters of vertical piping with water flowing through. I'm just wondering if it is correct that one for every vertical meter of pipe loses 9,81 kPa of dynamic pressure?

An electron in motion carries a magnetic field ... Quiz question:-- 1. Does its magnetic field travel fixed to the electron, and is therefor a -moving- magnetic field and induces an electrostatic potential in a perpendicular wire reaching-but-not-preventing the electron...? 2. If not...

what is "dynamic nature" of chemical equilibrium? Explain what is meant by "dynamic nature" of chemical equilibrum?? thank you