Dynamics Definition and 1000 Threads

Homework Statement A half-full water tank mounted on the top of a building is modeled as shown below. Find the shear force it can produce? m = 500 kg k = 1000 N/m model: https://app.box.com/s/qke2kbwag2mp9a23kkqq Homework Equations Transfer Matrix Method: Point & Field Matrices...

Dear All, would really appreciate some help with the following question - am struggling with dynamics at the minute! 1. Homework Statement An 8kg mass is suspended from a grooved drum at radius r1=200mm and with a speed of 0.3m/s it drops 1.5m. The outer radius of the drum is r2=300mm. Assume...

Homework Statement Homework EquationsThe Attempt at a Solution please help with this question.

I completed 4a successfully, and with 4b, i have 2 queries: a)why can't I let Reynolds # equal to 2.19 x 10^5 (from part a) then simply sub v=4 instead of 5m/s and rearrange for viscosity? I tried it this way first and got a very wrong answer. Why do we, essentially, need to work backwards to...

see I worked through 3a) and I was comparing answers, I saw that they omitted v2 (5m/s) their explanation was because it was "defined in the question" I'm not sure what that means 3)b I tried understanding what's going on but I am clueless unfortunately, how exactly did they get 12.1m ? Where is...

Hello friends I am from Saudi Arabia . I have a project in System Dynamics course . The Project is to design a fluid system that Qout should be 0.95 Mass flow rate enter the system.see the attached file for more information . Please if someone can give me a hint or the procedure how to start...

Hello :) My question concerns a control volume with a changing area. The momentum equation: p1A1-p2A2 = ṁ(V2-V1) is applied to the control volume. The image shows the equation found when applying the above momentum equation to the control volume: The bit I'm having difficulty with is the part...

Hello Guys! I'm Phillip John R. Endrinal. I am from The Phillipines and i am taking a Degree in bachelors of Computer Science. Im taking my thesis this semester but I am having trouble in defining my title. My thesis title is "3D Based Simulation Model: Dynamics in Physics for Educational...

Homework Statement Homework EquationsThe Attempt at a Solution i can't figure out the reasons for the statements. could you explain, along with th e physics involved. also, (a) and b(i). you are welcome to explain the numerical parts too.

Homework Statement So a body $m$ is on a uniform circular motion ($\omega = d\theta/dt = \text{constant}$), it is suspended by an inextensible rope with negligeable mass Homework Equations P = mg , didnt know what to put here The Attempt at a Solution So this is what the book did. What I...

Hello I have this problem - From a generator, I get a compton scattering with the electrons theta and phi angles. where I having the following equations for a particle px = E_particle * sin (theta) * cos (phi); py = E_particle * sin (theta) * sin (phi); pz = E_particle * cos (theta)...

When we write the equation for expressing the dynamics of capillary filling, why don't we include the effects of pressure difference?

Homework Statement A boy drags his 80 n sled at a constant speed up a 15 degree hill. He does so by pulling with a 35 n force on a rope attached to a sled. If the rope is inclined at 35 degrees to the horizontal, what is the coefficient of kinetic friction between snow and sled At the top of...

Homework Statement Disk D turns with a constant clockwise angular velocity of 30 . Disk E has a weight of 60 lb and is initially at rest when it is brought into contact with D. Determine the time required for disk E to attain the same angular velocity as disk D. The coefficient of kinetic...

Hello everyone, i need to find reported transfer functions of internal combustion engines for a project, i would appreciate the model of a four cylinder engine. If anyone knows about a book or some article which i can use, please let me know. thank you very much. the topic is related with...

Homework Statement A uniform ladder having mass 14kg and length 3m is released from rest when it is in the vertical position. If it is allowed to fall freely, determine the angle Theta at which the bottom end A starts to lift off the ground. For calculation assume the ladder is a slender rod...

I was doing some research into my coursework (don't worry, this isn't a real 'help!' thread) on Stokes law, and I found this equation on this forum (posted in 2010), regarding the effect of the walls of a pipe on the calculated value for viscosity when a sphere is dropped through that pipe...

Hi, I am looking for a really good reference textbook for learning classical mechanics.I understand it's pretty absurd to quote the subject as references to "Engineering Mechanics" as it's nothing different from the classical mechanics in physics.But I am looking for a perfect reference...

Homework Statement I am trying to establish the the dynamics of an inverted pendulum for further analysis. I understand that this is a well known problem, but the governing equations in various sources are different and make it difficult to keep track of what forces are being applied on the...

Homework Statement A child of mass m is supported on a light plank by his parents, who exert the forces F1 and F2 as indicated. Find the forces required to keep the plank in static equilibrium. Use the right end of the planks as the axis of rotation. ( Answer: F1=(1/4)mg, F2=(3/4)mg )...

Homework Statement A 4.7x10^3 kg asteroid is acted on by a gravitational force of 2.0x10^2 N from another asteroid that is 3.0x10^2 km (3.0x10^5 m) away. What is the mass of the second asteroid? Homework Equations The equations we have been working with are in which G is 6.67*10-11Nm^2/Kg^2...

Homework Statement A vertical jet of water of 3cm in diameter impinges upon a horizontal flat plate with a velocity of 4m/s, and all of the water spreads out horizontally. Find the force exerted on the plate. Homework EquationsThe Attempt at a Solution I am not 100% sure how to tackle this...

Homework Statement In the gear arrangement shown, gears A and C are attached to rod ABC, which is free to rotate about B, while the inner gear B is fixed. Knowing that the system is at rest, determine the magnitude of the couple M which must be applied to rod ABC, if 2.5 s later the angular...

Momentum in rigid bodies; In this problem when I draw all the forces acting on the disc A, would the reactions: Ax, Ay; W, Friction, normal force; I do not understand is how to check that Ay = W, that's what I understand from the solution. Anyone have any tips on how to treat reactions in such...

A. The problem: (If you want the short version just read the underlined statements) I need to describe the motion of a cue ball over the cloth of a billiard table. For rule, I can't use equations for rotational motion or 'Work and Energy theorems'. I have some ideas but I'm not sure about the...

Homework Statement During a sustained wind the blades on a two blade horizontal–axis wind turbine is turning with an angular velocity of 5 rad/s. If initially the blades have an angular velocity of 2 rad/s, determine the distance point P on the tip of the blade has traveled in 3.0 seconds...

Hello. I have a project in school in which I will be attempting to gain an increased understanding of orbital dynamics and the maths related to it and using this information to create a n-body simulation. I have a like 3-4 months to finish it and I'm currently in high school so I am only...

Hi all, I've recently been asked for an explanation as to why the Lagrangian is a function of the positions and velocities of the particles constituting a physical system. What follows is my attempt to answer this question. I would be grateful if you could offer your thoughts on whether this is...

Hi guys, I´ve just started with SDE and Itô´s lemma but don't really know where and how to begin. I´ve realized that both a Reimann integral and Itô integral is needed both cannot figure out how to solve these questions. Would be much appreciated if someone would help me.

When the beam of electrons reflect back to the grid due to the repeller voltage in reflector plate ,how the grid decelerates the returning electrons ?? And how they release their energy to the grid ?

Homework Statement Superman must stop a 120-km/hr train in 150 m to keep it from hitting a stalled car on the tracks. If the trains mass is 3.6 x 10^5 kg, how much force must he exert? Vi = 33 m/s (120 km/h) Vf = 0 m/s Displacement (Xf - Xi) = 150 m M = 3.6 x 10^5 kg[/B]Homework Equations...

Hello Physics Forums Community, I have completed ODE, 3 semesters of intro Calc, 3 semesters of intro physics, taking linear now. I have recently gotten the opportunity to work on little projects with a professor of astrophysics at a university. On the first meeting, the professor handed me...

1)The breech and barrel of a field gun have a total mass of 453.6kg. The recoil of the barrel is controlled by resistance forces from a buffer and recuperator, these forces are given by: Buffer force=71000/(s+1), recuperator force= P+ 4380s. (both are in Newtons). s is the recoil of the barrel...

Homework Statement A child is pulling a wagon of mass 7.38 kg up a hill inclined at an angle of 14.3° to the horizontal. The child applies a force parallel to the hill. The acceleration of the wagon is 6.45 cm/s2 up the hill. Friction is negligible. Determine the magnitude of (a) the force...

I want to go to physics grad school, but I also want to be ready to go to into CFD for industry if academia doesn't pan out - what area of physics would prepare me best for that?

Homework Statement Compute the Sverdrup transport (in units of Sverdrups) across 350 N in an ocean that is 6,500 km wide at that latitude, if the curl of the wind stress is -10-7 Pa/m. Wht is the direction of this transport? Homework Equations My = (1/β) * curlHt*w. Where, t is Tau (wind...

Homework Statement Hello, first year engineering student here :)https://fbcdn-sphotos-h-a.akamaihd.net/hphotos-ak-xpf1/v/t35.0-12/10744040_871781156179440_107104578_o.jpg?oh=73c4261941e7ef6b7c682558c0925a63&oe=544F5CA4&__gda__=1414428985_0415c28b8b2e194bf0b57f065267fe49 [/B] The question is...

Homework Statement http://imgur.com/eYoa8Ut Homework Equations Torque=rt=I(alpha) t-mg=-ma alpha = a/r The Attempt at a Solution t-mg=-ma is the equation for the hanging mass. To find how much this turns the small wheel, rt=I(alpha) I and r are known rt=Ia/r I'm not sure what to do from...

Homework Statement A uniform bar ABCD having a mass of 4.25kg is pivoted at B shown in Figure below. The bar ABCD is supported at A and D by springs having stiffness’s of 12kN/m and 2kN/m respectively. A torsional spring of stiffness 100Nm/rad is also present at the pivot B and a damper is...

Homework Statement Alternative link: http://oi62.tinypic.com/2iw28oh.jpg Homework Equations F = ma Ffriction = μN The Attempt at a Solution [/B]

Homework Statement Here is a picture of the problem! http://imgur.com/suJxZ0F Also here it is in text, Rod AB rotates with the angular velocity and acceleration clockwise as shown. Points A,B and C are pin connected. Point C is free to slide horizontally as shown in the figure at the instant...

Lets say i have a rod (length = L) hinged at one end (A).It is initially at rest.Now if an impulse (J) acts on the other end (B),can i conserve the angular momentum about A(the hinge)? that is can i write: JL=Iw?(I=moment of inertia,w=angular velocity) this is what i saw in the book. My Doubt...

Homework Statement Let P(t) be a population at time t, b(t) is the birth rate at time t and d(t) is the death rate at time t. Define the relative mortality μ(t) as the probability to die at age t. How is it normalized? Set up an equation of the absolute number of deaths at time t as a...

this is a part of a much bigger problem, I have a 600lb motorcycle going from point A to point B, which are 500 ft apart, i know the force exerted by the road on the motorcycle when the throttle is pressed is F(t)=300(1-.1t). I need time in order velocity at B , I'm really lost on where to...

Homework Statement [/B] http://imgur.com/TQf2TNP http://imgur.com/TQf2TNP Diagram for the porblem For this problem, you may assume the following: • The mass flow rate of water through the jet pump is always the same. • The combined mass of the rider and jetski is 450kg • The time dependent...

Homework Statement (apologies for the bad picture, but it was the only one I could find online) Homework Equations Conservation of energy, KE1 + PE1 = KE2 + PE2 PE = mgh KE = 0.5mv² The Attempt at a Solution I'm not sure where to begin. I know the answer but I don't know how you get it...

Homework Statement Two tanks are connected via a capillary pipe, with one tank over the other. The speed in which the liquid flows from the upper tank to the lower tank is 3472 cm/min. The height of the liquid inside the upper tank is 30cm from the bottom of the tank. The capillary pipe sticks...

Homework Statement Two spheres are hanging from cords as shown. The distance from the ceiling to the center of each sphere is 2m, and the coefficient of restitution is 0.75. If sphere "A" (m_a = 2kg) is drawn back 60^o and released from rest, determine: a) The maximum angle, θ_B , that sphere...

In the lagrangian formalism, we treat the position ##q## and the velocity ##\dot q## as dependent variables and talk about configuration space, which is just the space of positions. In the hamiltonian formalism we talk about canonical positions and momenta, and we consider them independent. Is...

Homework Statement I've attached a picture of the problem Homework Equations I'm assuming I need to use ads=vdv The Attempt at a Solution I've attached a picture of my attempt at solving the problem, but I really have no idea what I'm doing. I'm really having a hard time in this...