Dynamic Definition and 478 Threads

Hi all, MathLab seems to be hard for me. Any idea to simplify it?

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...

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...

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...

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...

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...

Dynamic and aerodynamic?

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...

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...

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''...

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...

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...

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...

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...

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...

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...

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...

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 -...

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...

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?

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.

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...

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...

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...

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...

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...

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...

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...

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) =...

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...

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...

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>...

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...

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...

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...

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...

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)...

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...

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...

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...

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

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...

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...

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...

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...

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...

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...

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...

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...

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?