What is Dynamic: Definition and 477 Discussions

Dynamic is an Italian independent record label located in Genoa. Founded in 1978, it specialises in classical music and opera, especially rarely performed works and has produced several world premiere recordings. The Dynamic catalogue contains over 400 titles, with about 25 new titles added each year and is distributed in 32 countries.

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  1. A

    Derivation of Dynamic Pressure

    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...
  2. C

    Classical Mechanics Dynamic Drag Resistance

    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...
  3. S

    Dynamic pressure on a surface?

    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...
  4. S

    Mark's Struggle to Solve Dynamic Systems Qn

    [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...
  5. P

    Liquid static head vs. dynamic head?

    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...
  6. D

    Take the Dynamic Quiz: Physics JPG Image

    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
  7. D

    Please anyone help me dynamic quiz i need it for a test

    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
  8. S

    Coefficient of dynamic friction

    Homework Statement A 4 kg collar C rides along a horizontally rotating arm AB. A spring k connects C to A. The arm AB rotates at a constant rate of 15 rpm. At the illustrated instant r = 1 m, r˙ = 1.1 m/s, and r¨ = 4 m/s2. The coefficient of dynamic friction, μk, is equal to 0.3. What is the...
  9. D

    Static and dynamic friction

    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?
  10. C

    Dynamic refraction vector

    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...
  11. B

    Dynamic Acceleration Problem: Finding Velocity at t = 6.5 s

    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...
  12. G

    Brownian Dynamics: Get Help on Presentation

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

    Dynamic & Static propeller pressure

    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...
  14. R

    Strategies for Programming Feedback Control Systems

    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...
  15. H

    Can a 100kg object on a rough surface be moved with a 30° angle force of 800N?

    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...
  16. H

    What is the distance covered by an object thrown in viscous matter?

    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...
  17. H

    How Does Viscous Resistance Affect Object Motion?

    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...
  18. M

    How Do You Solve These Challenging Physics Problems?

    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...
  19. W

    Static pressure vs. dynamic pressure

    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...
  20. G

    Dynamic Pressure Calculation at Hydroelectric Power Station Valve

    A hydroelectric power station is supplied with water from a reservoir. A pipeline connects the reservoir to the turbine hall. The flow of water through the pipeline is controlled by a valve which is located 500 metres below the surface of the water in the reservoir. The lower end of the...
  21. F

    Measuring two dynamic quantitites

    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?
  22. D

    Grain Boundaries & Dynamic Recrystallization

    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...
  23. A

    How can I solve a problem involving dynamic systems in physics?

    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...
  24. H

    Fluid Dynamic: Stokeslet? Rotlet?

    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...
  25. T

    Questions Concerning Static and Dynamic Properties

    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...
  26. H

    Dynamic Mesh Analysis for Wind Turbine Blades

    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...
  27. D

    Dynamic Mass of Photon: E=mc^2 & hv

    i think E=mc^2 and E=hv so dynamic mass of photon is m=hv/c^2 ??
  28. DaveC426913

    Publishing dynamic pages to flat HTML

    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...
  29. S

    What is the Role of the Dynamic Quantum Vacuum in Quantum Mechanics?

    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...
  30. I

    Dynamic Rotation Total Torque Calculation

    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...
  31. B

    An argument against string theory; geometry is dynamic

    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...
  32. A

    Mathematica Building a hybrid and dynamic mathematical space

    building a "hybrid" and dynamic mathematical space Hello, Maybe I'm going to say very stupid or crazy thing for real mathematicians (I'm an architect): I want to build a concept that I call "dynamic abstract space" ("das" from now) for a digital architecture project. I would like to be able...
  33. T

    Dynamic forces with radial acceleration

    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...
  34. I

    Absolute Pressure of Fluid: Static + Dynamic = 15psi?

    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...
  35. I

    Stuck on a Water Tower Pressure Problem: Dynamic or Static?

    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...
  36. DaveC426913

    Project 251A: calculating area of dynamic shapes

    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...
  37. P

    Op. amp tuned to dynamic range ?

    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...
  38. N

    Omnigraph OGR File Download: Fast Forward the Dynamic Constant

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

    Dynamic Pressure: Is 9,81 kPa Lost per Vertical Meter?

    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?
  40. A

    Mathematica Building a hybrid and dynamic mathematical space

    building a "hybrid" and dynamic mathematical space Hello, Maybe I'm going to say very stupid or crazy thing for real mathematicians (I'm an architect): I want to build a concept that I call "dynamic abstract space" ("das" from now) for a digital architecture project. I would like to be able...
  41. R

    Pop quiz - electron magnetic field - dynamic or static

    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...
  42. R

    What is dynamic nature of chemical equilibrium?

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

    My fluid dynamic project, i need explenation

    I have a physics project and i chose the topic of fluid dynamic (i don't know of it is really fluid dynamic but i think that is close enough). My level is only a high school student for information, in order to avoid any over complicating explenation. The concept is simple: first pour a...
  44. Gamma

    EM theory and therom dynamic books

    Hello, I need to purchase two books, for EM theory and Thermodynamics. I have briefly used couple of books years back and I can't seem to remember their titles or author. I slightly remember that the EM book was a blue color with a lots of information for first year - 4th year...
  45. F

    Building Dynamic Webpages: Alternatives to Coldfusion

    I'm trying to build a Dynamic webpage, I tried with Dreamweaver and Coldfusion, but Coldfusion is kind of confusing, isn't there other software out there that can do this too. Or do you know of other alternatives? Thanks in advance, FrostScYthe
  46. R

    Physics What Careers Involve Dynamic Physics?

    I am currently in High School and I really like Dynamic Physics and can you suggest some careers that involves the use of the concepts of dynamic physics. Thanks
  47. J

    Static and Dynamic Equilibrium

    Static and Dynamic Equilibrium! What is the difference between static equilibrium and dynamic equilibrium?
  48. M

    Dynamic Topology and the Impact of Expanding Spacetime on Subsets and Dimensions

    Just curious if anyone has ever studied what happens when a topology gains new members in the underlying set. How is it incorporated into the existing subsets whose union and intersection are included in the topology? It seems to me that assuming the universe expanded from a singularity, then...
  49. M

    How is adiabatic invariant proved in a simple dynamic system?

    I'm reading a book on quontum mechanics in japanese (Quontum Mechanics by Shinichiro Tomonaga) and am stuck in proving the action variable "J" is constant in a one dimensional cyclic movement. i.e. The action variable "J" created by the trajectory of H(p(t),q(t),a(t/T)) = E(t) doesn't...
  50. S

    Dynamic application of torque with center of mass

    ok here is the problem <br>A uniform meter stick of mass M has a half-filled can of fruit juice of mass m attached to one end. The meter stick and the can balance at a point 33.0 cm from the end of the stick where the can is attached. When the balanced stick-can system is suspended from a...
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