Modeling Definition and 554 Threads

Hi All, I'm trying to figure out how to model a rolling ball in the x y plane. I've started with the basic equation of motion with constant acceleration d = v_{}0t + 1/2at^{}2 v_{}0 is the initial velocity a is acceleration t is time Assume that v is a vector at an angle \alpha...

This is a bit of a general question, but does anyone happen to know a good book, resource, or author in the field of accurate population growth and decline modeling? I'd like to find a good academic (non-website) source to get a general idea of the main things a population ecologist looks at...

Hi all, I have brave hopes of modeling the following problem: Imagine an antenna transmitting an ~50V 100kHz sine wave. Imagine a receiving antenna placed three or four feet apart, with an amplification and detection circuit. First, measure the amplitude of the received wave. Next...

Homework Statement R' = aJ J' = bR What happens to the graphs of R(t) and J(t)? The Attempt at a Solution I made the matrix {{0, a}{b, 0}} and then got the equation (L=lambda) L^2 - 0L + (a+b) after computing the trace and determinant of that matrix. I then solved for the...

Homework Statement I am supposed to be tutoring pre-calc, and they are currently studying modeling with equations, i haven't have pre-calculus in years, and there are no sufficient examples in this book and i could use assistance helping these kids! I feel like I should know how because the...

Homework Statement A child running along level ground at the top of a 30-ft-high vertical cliff at a speed of 15 ft/s, throws a rock over the cliff into the sea below. Suppose the child's arm is 3ft above the ground and her arm speed is 25ft/s. If the rock is released 10ft from the edge of the...

I have read some papers where they say they are using a computational approach to modeling something complicated, like a simplified stock market or something, and they usually say that one of the reasons they are using a computational approach is becuase it would be "very difficult" to come up...

Has anyone had any experience with this software? I'm finishing up at my local Community College this year, and plan to take two classes in the Art department titled "3D Modeling" and "3D Animation". One counts as my Art general education requirement, but I plan on taking the 2nd semester...

Iv'e got an exam in like 2 weeks and i don't have any material on how to do this question so i know the forum says i should make an attempt at the question but i really don't have a clue where to start could someone run me through it please so i will be able to answer it and others like it in...

I have a question of show that y=x is one solution of the equation (1+x^2)y''-2xy'+2y=0) this is a question that i need to know for a coming exam. i understand and can do everything until the question gets to v''+(2/x(1+x^2))v'=0 then the question skips to IF =e^integral of (2/x(1+x^2))dx...

Hi everyone! I have a question for you :) I am wondering, if there already is a developed model, imitating insect wings, e.g. bee wings. If you happen to observe them, they seem to be much more complex, but also much more useful and allow a more flexible movement. Insects fly with them not...

alright I've got to model a PMDC motor and a mechanical system attached to it this is what i have so far for the equations part, which is where the problem is (im trying to graph the time histories of the 3 DE's) the bolded part is where the problem is. if i substitute it for a constant...

So I have been further researching possible career paths with a degree in math that would suit me, and I came across the idea of modeling and simulation for national defense (for example...

I was recently commissioned by one of my neuroscience professors to help him develop a new gameplan for possibly describing neural networks with dynamical systems theory. In his most recent paper on the subject, he used Hidden Markov Modeling to detect coherent rate patterns in populations of...

Most Americans know of this game show hosted by Howie Mandel. A friend of the Child of Evo's has just signed a contract to be one of the models that opens a briefcase and supposedly she will get paid $600,000.00. That's just sick.

In my math homework, a problem asks to derive the function of a set of given points. After plotting all the points I realized that the graph is a curve with a negative slope. I have no idea on how to derive a "Best Fit" function that represents the curve. Is there something easy that I am...

I was hoping to get some input from someone in an engineering field about how important physical modeling is to you. for example: how long do you spend on it, how closely does the model resemble the final project, do you think it's vital or a waste of time, or does your place of business even...

Homework Statement i was reading this book for school called investigating change and i was really lost on question 4: tides of an area and their times are as follows: high tide: low tide 1.64m 12:08am 0.4m 6:03 am 2.32m 12:46 PM...

Use P0 = 3.9 (1790 population) as your initial condition to find the particular solution for this differential equation. Note: You may find it easier to solve in terms of the constants a and b. Show all the steps in your solution. This is the last step to a multi-part problem. I basically did...

What is the justification behind these models to assume electrons as non-interacting? Because it is clearly not the case when considering coloumbic interactions.

Use P0 = 3.9 (1790 population) as your initial condition to find the particular solution for this differential equation. Note: You may find it easier to solve in terms of the constants a and b. Show all the steps in your solution. This is the last step to a multi-part problem. I basically...

I understand the basics of color theory and I need to explain it to some graduate level bio-students. Now I need to incorporate the biological funciotions involved in this process and relate it to avian species. Now I have a brief understand of the human eye abosorbtion curves which peak at...

Several years ago, after reading about Wheeler's quantum foam, I wondered what would happen if you used wormhole propogation and a quality in some wormhole positions to prefer taking the shortest distance to the next position (mass) to try to reproduce effects similar to gravity. I had also just...

Hi, I would like to know "how the braking system in a car can be modeled" i.e.,upon applying the force on pedal,how the force gets applied on the tires of the car.Please also give the equations which need to be considered for developing the model. Thank you.

I am trying to write a simple java program to model the motion of planets according to kepler's second law. I have everything working...except I can't find how to find an equation relating position and time. I have x = a cos(t) y = b sin(t) where a and b are the semimajor and semiminor...

Hi all, I'm new to the forums, so forgive me if I'm posting in the wrong place. Strictly speaking, this isn't a "homework" question in that I'm not presenting a specific problem to be solved...But I have been assigned a project (due in a week...damn you, procrastination!) that involves...

Greetings all. I am attempting to write a program that will calculate how long a spaceship will take to move from Point A to Point B. This is actually an attempt to model my favorite computer game, so it isn’t 100% accurate in comparison to the real world. The developers introduced an element of...

Hi! I have a project where I am supposed to model the s-process in a star in its Helium shell burning region, and i shall do this for a variation of neutron exposure, where neutron exposure are defined as: \tau = N* \Delta t , t is time. N is number density of neutrons. So I in...

Homework Statement This is from the book Calculus Single Variable, 4th edition: The cross-section of a tunnel is a rectangle of height h surmounted by a semicircular roof section of radius <i>r</i>. If the cross-sectional area is A, determine the dimensions of the cross section which...

Hello, I am a High school algebra teacher looking for a modeling tool for algebra tiles. I have four sources of online "virtual" manipulatives, but none of them do what a set of algebra tiles on an overhead can do. First there is the National Library of Virtual Manipulatives...

Homework Statement In general, I know that the dynamic equation of pendulum is theta'' + (k/m)*thata' + (g/l)*sin(theta) = 0 , where k=friction co, m=mass, l=length of string, g=gravity. But if the pendulum is placed in a constant draft, the equation has to be changed. Assuming...

Hello! i've been thinking, how can i get start modeling a heat pipe. At least a conceptual approach . it would be very helpfull ir someone here post any bibliography. thanks!

Homework Statement Had our choice for a topic for a project, and I picked math modeling. My Original Research Question: In what way can a playing card be thrown in order to maximize the distance it travels? My Simplified Research Question: In what way can a flat disc be thrown in order...

Homework Statement Had our choice for a topic for a project, and I picked math modeling. My Original Research Question: In what way can a playing card be thrown in order to maximize the distance it travels? My Simplified Research Question: In what way can a flat disc be thrown in order to...

heres the class syllabus: Introduction to fundamental principles and spirit of applied mathematics. Emphasis on manner in which mathematical models are constructed for physical problems. Illustrations from many fields of endeavor, such as physical sciences, biology, economics, and traffic...

computer modeling of motion of planets! hi everybody what would happen on the position and orbit of the Earth and the moon, if the mass of the moon will gradually increase within a day and becomes greater than the mass of the earth. will it brings a big disaster in the earth? will moon...

http://physicsworld.com/cws/article/news/30711 Also here

Dear All, I would like to introduce this website; http://www.imodelit.com" . imodelit.com portal is an online library of device modeling tools for electrical engineers. It offers unique solution to satisfy the initial design steps of optical and microwave components. imodelit.com main goal...

Hi, I've been looking into ways to model fracture in real-time and i ran into a few papers on the net, one was by a few people from MIT compsci lab that seemed to fit what i was trying to do very well. However some of the math in it is a bit involved. The link to the paper is, for instance...

Homework Statement For my Extended Essay I am modeling the flight path of a soccer ball under various conditions. Currently, I have a model for an extremely basic soccer kick with no spin and only gravitational forces, with no drag. My goal is to model the kick firstly with the addition of...

Hi, I have nothing to do this summer so I figured I would like to model the heat transfer for different shapes and fluids and compare with experimental values.. :) Anyway I searched on google and found nothing. What are the main problems? For example is it acceptable to assume that the...

Does anybody know of free 3-D EM software so that I can model a transformer? In particular, I'm interested in mapping Poynting vectors. Thanks.

I need to determine an equation that models tidal patterns. High tide is at 12:00am Low Tide 6:10pm High tide returns at 12:24pm High tide is 5.4m and low tide is .1m Therefore the amplitude is (5.4-0.1)/2 = 2.65 The mean value is 2.65+0.1=2.75 Therefore y=2.65cos(Bx+c)+2.75 Im yet...

I'm receiving a lecture on Modeling the Heart for about three weeks. We were assigned a problem which required us to find the mean Psa value.. Where Psa(t) = Psa(0)*exp(-t/(Csa*Rs)) and Psa(0) is the initial value, and Csa and Rs are constants. Now What i did is intergrate this like...

Air resistance is a force that acts in the direction opposite to the motion and increases in magnitude as velocity increases, let us assume at least initially that air resistance r is proportional to the velocity: r = pv, where p is a negative constant. suppose a ball of mass m is thrown upward...

Hope this finds you well... i am having a problem analyzing a simple model that consists of 2 rectangles intersecting. the creation of the rectangles, material definition, BC, loading conditions...etc is done. but first: how can i define one rectangle to be a rigid body? second: the vertical...

So I've been given a differential equation that models bacterial growth, p(t), and the concentration of critical substance, q(t), whatever that's suppose to mean. I've solved both of these and found that: q(t) = q_0 e^{vt} Where q0 is the amount critical substance at t=0. v is a constant. I...

Modeling with power functions. I have turned to every book i own on math from algebra to math encyclopedia to calculus ab book. I seriously don't know how to come up with a power function for a set of data. I don't even know any techniques. There are no zeros or intercepts to this set of...

I'm not sure where to place this, so please forgive me. As you know, an electron experiences a force of F = qVxB in a magnetic field and equating this to centripetral force, we can find the radius of the electron's path to be R = mv/qB Ok, that's simple enough. Now, I want to model an...

Hello! I am looking for a software that can build models and can imitate the action of that model. The model will be made out of rubber-bands, cog-wheels, weights and more... anyone knows of such a software? it is very important... thanks!