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. Ascendant78

    What is the Direction of Force in a Falling Object's Free-Body Diagram?

    Homework Statement A 40kg person is falling at the speed of gravity, 9.8m/s^2. Wind resistance is not considered. On your free-body diagram, the direction they are falling (ground) is in the negative direction, hence gravity is causing an acceleration in the negative. Homework Equations...
  2. C

    When can you assume dynamic equilibrium?

    SOLVED Homework Statement A 23 kg child goes down a straight slide inclined 38∘ above horizontal. The child is acted on by his weight, the normal force from the slide, and kinetic friction. Find the magnitude of the normal force. Homework Equations cos(theta)=adjacent/hypotenuse The...
  3. marellasunny

    Radar as range detector between cars-static sender vs dynamic sender

    Say I have a radar transmitter on a car,used to detect its distance from a car in front of it by measuring the doppler shift on the reflected wave. i.e Car 1 is the source, its wave gets reflected by Car 2 in front of it. My book splits the problem of calculating the Doppler shift by computing...
  4. J

    Converting from Static to Dynamic Understanding the Darcy Weisbach

    Trying to get my head around something with the Darcy Weisbach. It is used to calculate the head loss of a moving fluid within a pipe. So for example if we take a pipe with an entry point 6m above a datum plane and an exit point 1m above the same datum plane. The pipe length is very long, say...
  5. M

    Science isn't the kind of circular dynamic I thought it was.

    Science isn't the kind of "circular dynamic" I thought it was. "Why the laws are as they are is a pretty easy question to answer." The statement above really bothers me. Why is C constant? Why does mass distort space-time? ... Experiment tells us what the laws are but experiments don't...
  6. T

    How Do Dynamic and Aerodynamic Concepts Differ from Static?

    Dynamic and aerodynamic?
  7. C

    Why isn't passive dynamic walking used more?

    I was researching movement models for bidpedal locomotion and when I stumbled across this amazing video of passive dynamic walking from 1990. But all the papers now I find are about neural oscillation. I do not find a mention of passive dynamic walking anywhere. Was there some kind of fatal flaw...
  8. J

    MATLAB How to do a dynamic graph in matlab

    Hi guys, so I've never used MATLAB before, and i need to make a plot that changes constantly. Let's say that i have Sin(x) from 0 to 3pi Then i need it to change to a Cos(x) from 0 to 3pi then to a Tan(x). I could do it in other languaje like Php or c, but in MATLAB i have no idea. I...
  9. C

    Activation energy from dynamic NMR

    Homework Statement I need to calculate the activation energy (barrier of rotation) of an amide bond. I have NMR spectra at various temperatures. I know that once I have the rates I can do an Arrhenius plot to find the activation energy, but I'm having trouble with the ``finding the rates''...
  10. I

    Calculating Fluid Dynamic Forces on a Towing Cable

    I am trying to develop a calculator to approximate the depth of a trolling rig used by fisherman, which is typically a lead weight with a hook (jighead), attached to a single plastic/rubber shad body (http://www.tacklecoveshop.com/images/Product/icon/1734.jpg). The other typical rig is a...
  11. TrickyDicky

    Dynamic solutions in time-independent spacetimes

    Hi, I would like to clarify this probably trivial little issue that is bugging me: How should dynamical solutions be understood in the context of a static spacetime? To exemplify what I mean I'll use a well known case, the source-free Maxwell eq. in their explicitly covariant form set in...
  12. R

    Dynamic Soaring: Explaining the Errors of an Innovative Theory

    Hi! Slightly oddball request. A nice, but mistaken guy has produced this website-http://www.dynamic-soaring-for-birds.co.uk/ and further written about his ideas here-http://www.bou.org.uk/dynamic-soaring/ He contends that Dynamic Soaring is possible utilising a constant horizontal...
  13. M

    Dynamics help: Spring force and dynamic motion

    The 20-kg sphere, attached to a spring of stiffness 500 N/m is released from an un-stretched position of the spring, as shown in the figure. Determine the velocity of the block “A” of mass 10 kg, at the instant the ball has fallen 25 cm. A roller mechanism keeps the spring in a vertical...
  14. T

    Dynamic Math Software for Online Tutoring

    I'm thinking about doing online tutoring. I already know how to use latex on a website but I need to be much faster for a live tutorial session. Is there a way that I can write my math down on a tablet and have it automatically converted in rich math text and also have it automatically...
  15. S

    Lumped parameters model: inverse dynamic

    Hi all, I have a ground excited single degree of freedom model, like that: http://www.bsw-schwingungstechnik.de/fileadmin/user_upload/images/2/graphic-passiv-isolation.jpg I know the excitation function, i.e. s(t), but I need to know the force that imposes a specific s(t). I need it...
  16. W

    Engineering Circuit Voltage Dynamic Equations

    Homework Statement As part of a larger problem, I'm trying to understand the dynamic equations of the attached circuit with two capacitors and one resistor and a voltage source. When I use Kirchoff's Current Law at nodes V0 and V1, I get the following equations. Homework Equations See...
  17. W

    Dynamic Equations of a Circuit?

    Hello, As part of a larger problem, I'm trying to understand the dynamic equations of the attached circuit with two capacitors and one resistor and a voltage source. When I use Kirchoff's Current Law at nodes V0 and V1, I get the following equations. 0 = (dVs/dt-dV1/dt)*C1 - (V1-V2)/R -...
  18. I

    Comparing thermo dynamic processes

    Homework Statement in a cylinder, 1.2 mol of an ideal gas, gamma = 1.67 initially at 3.60 x10^5 pa and 300k, is compressed until the volume is halved. I need help with 1) c and 2) Compute work done on the gas if the compression is: 1) a) isothermal b) adiabatic c) isobaric...
  19. S

    Dynamic - Medium Acceleration

    This I something I always wondered, but never could get my finger into: ##a_m = \frac{v_2-v_1}{t_2-t_1}## Alright, that's medium acceleration, but why isn't it: ##a_m = \frac{a_2-a_1}{t_2-t_1}## I mean, it does make perfect sense in my mind. Is it just because it was defined that way?
  20. S

    Objects in dynamic equilibrium

    What makes objects in dynamic equilibrium move? It can't be gravity because then it would only be one force and if an object is under the influence of one force, then it cannot be in equilibrium. Any help would be appreciated.
  21. R

    Schools Studying Chaos Theory & Dynamic Systems: A Guide for Postgraduates

    Hi everyone, it's been a while since I visited here. However, I now find myself in need of help as to how to best go about studying something related to chaos theory and dynamic systems in postgraduate school. I'm currently in my third year of physics and my first question would be what...
  22. U

    Help understanding dynamic equilibrium

    Homework Statement if the equilibrium rule states ƩF=0N, how can something move or be moving at a constant speed ? eg I push on a box with 50N and friction provides 50N back, resulting in ƩF=0N. So I am not providing more N than the box is resisting with. I thought something could only be...
  23. pairofstrings

    Dynamic memory allocation and structure fields

    Please take a look at my program. Please help. I want to allocate memory dynamically for one field in structure. I tried to write the code but it has error. I posting a paint document for you to see. Help me please. Please tell me why is my code not working properly and what needs to be done...
  24. slider142

    Math & Science Dynamic Page Layout IDE

    Hi, I have done an elementary search, but have not found the software I am looking for. I would like to work with page layout software that has the dynamic drag-and-drop WYSIWYG repositioning and textflow capability of Adobe InDesign, but that also allows inline LaTeX math typesetting and...
  25. B

    Static and dynamic analysis of a crank with pedal

    Hi. me and my friend have a problem that we can't really agree upon. we are doing an analysis study on a bike's crank and pedal. the first picture shows how we put the force of 210 N. picture 2 shows how we used "fixed geometry" to lock the part in place. now, this is the static...
  26. P

    Dynamic Programming with 2 state variables

    Homework Statement Derive the Euler Equation of the dynamic programming problem: \[max_{\{ z_t \}^\infty_{t=0}} \sum_{t=0}^{\infty} \delta^t f(x_t, y_t, z_t) \] subject to: x_{t+1} = g_1(x_t, y_t, z_t), \ y_{t+1} = g_2(x_t, y_t, z_t), \ x_0 = x^0, y_0 = y^0 and where \delta <1...
  27. M

    Rotational dynamic equilibrium problem on an angle

    A man drags a 67.0-kg crate across the floor at a constant velocity by pulling on a strap attached to the bottom of the crate. The crate is tilted 24.0° above the horizontal, and the strap is inclined 64.0° above the horizontal. The center of gravity of the crate coincides with its geometrical...
  28. A

    C Programming: Dynamic allocation of 2D arrays using an array of pointers.

    Homework Statement Ok, I'm learning C programming and I'm trying to create a dynamic 2D array. This is the code that seems to work in creating a dyamic array. I found it in a book. //rows and cols are values entered by the user when the program runs. int **(matA) =...
  29. C

    Methods of Accurate Dynamic Mass Measurement?

    Hi all, As part of a project I am working on, I need a method of dynamically measuring change in mass (preferably at least 1 measurement per second). The maximum expected load is 10kg, and the measurement needs to be accurate to at least ±0.1g. So far, all that has been suggested to me is the...
  30. 3

    Dynamic system question HELP

    I'm having difficulty with this question In the diagram, the coefficient of kinetic friction between the 2.00 kg and the 3.00 kg blocks is 0.300. The horizontal surface and the pulleys are frictionless, and the masses are released from rest. (a) Draw a free body diagram of each block...
  31. Dembadon

    Comp Sci C++: Dynamic memory allocation using a struct member

    Homework Statement I am trying to allocate memory on the heap (free-store) for an array of characters using one of my struct members, which is a pointer. However, I am running into scoping issues no matter how I try to go about doing it. Homework Equations <data type> *<pointer name>...
  32. B

    Comp Sci How can I dynamically name files in C++ using a string and integer?

    Hello, I'm wondering how to name/open a file whose name is given by a string with an integer appended at the end, i.e., something in the style of the following. Thank you! int i = 5; ofstream fout; string s = "Hello " + i; fout.open(s); // write something to the file...
  33. N

    Dynamic Stall Pressure: Understanding EAS & TAS

    Homework Statement \frac{1}{2}rho0VEAS^2= \frac{1}{2}rhoVTAS^2 The Attempt at a Solution Basically what I've understood is that the TAS (true air speed) doesn't matter when calculating the stall dynamic pressure since what matters is the speed at which the plane is going relative to...
  34. P

    Dynamic behaviour of a rotatable airfoil, at constant and variable flow field

    Homework Statement While I was learning about drag and lift on airfloils, I imagined a special airfoil which is fixed at a certain elevation and cannot move vertically (y axis) but can be rotated around its axis (z). Let's assume the direction of the flow to be the x axis. I try to predict...
  35. C

    Detecting Oscillation in Dynamic Models: A Time-Intensive Challenge

    For a general family of dynamic models, xk+1=f(xk), oscillation can occur; for example, the function xk+1=xn2-1 experiences oscillation under the starting value 0: (x2=x12-1=x2=02-1→x2=-1→x3=x22-1=x3=-12-1→x3=0) This type of oscillation must be capable of detection before actually pluggin...
  36. T

    Dynamic FBD - Man and box sliding on an incline

    Homework Statement http://img59.imageshack.us/img59/493/capturemml.png The Attempt at a Solution Here is my attempt. I assumed that both the man and the box would slide down the incline. (The box is the left diagram and the man is on the right)...
  37. K

    Dynamic Programming (Approximate, Differential), Model Predictive Control

    Hello, Could someone please explain in a short summary what the difference between the following are: 1. Dynamic Programming from Control Engineering literature and Dynamic programming from Reinforcement learning literature? 2. Approximate Dynamic Programming vs Differential Dynamic...
  38. A

    Outgoing dynamic force: taper roll between flanges

    Maybe I've asked this before but I can't find the topic any more. I'm looking for a way to calculate the outgoing force of a taper roll between two spinning flanges. Staticly this is not so difficult by using the force of the flanges clamping the taper roll and the roll angle. When the...
  39. S

    Dynamic light scattering laplace inversion

    Hi, Those of you familar with dynamic light scattering (DLS), will know that a common method used to obtain a particle size distribution is via a laplace inversion of the autocorrelation function. What I want to know is why? What does Laplace space have to do with DLS (I've only learned...
  40. N

    What alternatives can be used instead of dynamic arrays in Verilog and Quartus?

    hello everyone I know that dynamic array is not supported in Verilog and Quartus. I want to know does anybody has an idea or algorithm to use instead of dynamic array. I mean I am searching for something that works instead of a dynamic array. thanks
  41. S

    Dynamic Soaring of Gradients or?

    Dynamic Soaring of Gradients or? See my Video Exp http://www.icarusengineering.com/Dynamic-Soaring-and-SE.htm I am trying to validate that the aircraft is indeed flying in 2 different air masses instead of just one rising air mass of a normal thermal. Using 2 types of gradients would...
  42. S

    Dynamic Soaring of Air masses Video

    http://www.icarusengineering.com/Dynamic-Soaring-and-SE.htm I am trying to validate dynamic soaring versus normal thermal soaring, but both are using thermals as the power source. Dynamic soaring would mean using 2 types of air masses. One in the thermal and the second one is the inflow to...
  43. P

    Errors in Cv Testing Results for Dynamic Torque Test

    Hi all, Preface: So I have run several series of dynamic torque tests on different size 1/4 turn Butterfly valves. In the test, I am measuring upstream pressure, downstream pressure, valve angle (90° is open, 0 is closed), and torque on a transducer. I know the flow rate, which is in GPM...
  44. S

    Fortran Need some help with dynamic memory allocation in Fortran

    Hi, I need some help with allocating arrays dynamically. I have an array whose size keeps changing at each step - I start with a row vector and add another row vector at each step of a cycle. I need to use this new array for further calculations. I've been trying to declare the arrays...
  45. N

    Dynamic Analysis Cantilever Beam (Staad Pro vs Analysis)

    Hello Phys Forum I’m trying to solve a dynamic problem that involves a cantilever beam fixed onto a support that experiences a time history load on the free end of the beam as shown below: / / /--------------------------------[] / / Cross section Beam is rectangular beam with 1m width and...
  46. SonOfGod

    Calculation of Divergence dynamic Pressure

    Hello everyone, I am revising for my final examination. I came across this simple problem which I can not solve. the problem is from a textbook (Introduction to Structural Dynamics and Aeroelasticity By Dewey H. Hodges, G. Alvin Pierce). It is the 7th question in the problem sets of the 3rd...
  47. zonde

    Static vs Dynamic: Can Massive Particles Have Parallel Spacetime Trajectories?

    Can two massive particles have parallel spacetime trajectories? It seems that the answer is - no. And the closer they are the more they can't. But in that case we can't have static structure consisting of massive particles. Any composite structure would have to have something like phasespace...
  48. E

    Dynamic Maxwell equations, uniqueness theorem, steady-state response.

    Hello, I'm trying to make a sort of "system theory approach" to dynamic Maxwell's equations for a linear, isotropic, time-invariant, spacely homogeneous medium. The frequency-domain uniqueness theorem states that the solution to an interior electromagnetic problem is unique for a lossy...
  49. W

    Significance of kinematic and dynamic viscosity

    It is stated that kinematic viscosity is the ratio of dynamic viscosity to density. can anyone elaborate it further that what are the uses of both types of viscosities and why we differentiate them.does dynamic viscosity reates with static fluid?
  50. T

    Determining the coefficient of static and dynamic friction

    I have a Mathematics C assignment, with one question being about static and dynamic friction. But I think it fits this forum. Anyway, we need to conduct experiments to show if there is a difference between static and dynamic friction or not with three different surfaces. The weight of the...
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