Dynamics Definition and 1000 Threads

Homework Statement i just want everybody to check if my solution is correct.. because I am not confident with this one.. your help would be highly appreciated Question: The 0.31kg mass slides on a frictionless wire that lies in the vertical plane. The ideal spring attached to the mass has a...

< Mentor Note -- thread moved to HH from the technical physics forums, so no HH Template is shown >[/color] I've searched for help before posting, found this thread that is asking for the same assignment by unfinished so I'll just copy and paste lol...

Hi, Basically I have a point cloud that represents balls with different radii. They are all moving based on forces and sometimes they are intersecting with each other. Imagine the yellow ball is going in one direction while the blue balls goes in another direction. At one time they are...

1. Homework Statement Homework Equations CFD The Attempt at a Solution I'm a bit confused by this question. So at first what I do for the problem on the left, I find the changes in the velocities in X and and Y on all four sides. I notice that the values on the diagram to the left are...

The general motion of a rigid body can be considered to be a combination of (i) a motion of its centre of mass about an axis, and (ii) its motion about an instantaneous axis passing through the centre of mass. These axes need not be stationary. Consider, for example, a thin uniform disc welded...

Dear All, I am often get confused when four terms STATICS,DYNAMICS,KINEMATICS and KINETICS are used in physics Mechanics.can someone please differentiate between these four terms.i will be thankful.

I'm new with ansys if I can help it would be helpful. the problem is that two solids are shocked, but one of them is going through the other, have already implemented several things different tutorials but the answer is the same. the only question when I change the location fixed support the...

Is there a theory of dynamics in VCSEL lasers? Especially polarization dynamics? So far I confronted mostly empirical derivations with a bunch of coefficients. I was wondering if there is a more general theory, probably based on quantum mechanics, concerning dynamics in VCSELs? If so, please...

Homework Statement Homework Equations Conservation of linear momentum for fluids The Attempt at a Solution This seemingly simple problem has me confused. First of all, I want to set up the sum of the foces as: -Min + Mout -Fx = 0 So first of all, not only does my Fx term have the wrong...

Homework Statement For what m1 will the illustrated pulley system be in static equilibrium if m2 = 60 kg? Homework EquationsThe Attempt at a Solution im supposed to use the change in lengths but don't know how to do it

Looks like something special happening here: http://arxiv.org/abs/1503.01424 Extending dualities to trialities deepens the foundations of dynamics Lee Smolin (Submitted on 4 Mar 2015) Dualities are often supposed to be foundational, but they may come into conflict with background independence...

I'm currently studying Mechanical Engineering at Level 3 in the UK and I'm beginning my integrated masters in September. I've missed a large chunk of my studies this year due to a broken collarbone I sustained earlier in the year. Instead of getting any special dispensation I'm trying to work my...

Hi, I'm attempting to do a question involving blood flowing through a blood vessel and I'm incredibly stuck and would appreciate some help. The question is as follows: 'A simplified model of blood flow through the human body makes the approximation that the flow I is proportional to the pressure...

Suppose we have a block on an inclined plane. If we choose the x-y axis to be parallel and perpendicular to the inclined plane, then we have Fy = N - mgcos30 = 0 But if we choose our trivial x-y coordinate system, where y is parallel to the force of gravity, then we get: Fy = Ncos30 - mg =...

Homework Statement Homework Equations F=ma Ff = N u The Attempt at a Solution Pretty much, I did the same thing in the solution. For box A: N = mg Ffs = mg*uk = 9.81*20*.4=78.48N I note that Ffs > 60 N, so the boxes will move with the same acceleration Now there are two ways I can...

We all know that momentum is conserved in a system. But I am confused of one thing. Suppose we have a system containing a wall with very large mass and a ball and use a classical x-y coordinate axis. If I swing the ball at an angle of 45 degrees from the horizontal, upwards to the huge wall...

Homework Statement The 75kg boy leaps off the cart A with a horizontal velocity of v' = 3 m/s to the left measured relative to the cart. Determine the velocity of cart A just after the jump. If he then lands on cart B with the same velocity that he left cart A, determine the velocity of cart...

Here is our momentum equation for when two separate masses m1 and m2 collide with each other and couple together m1v1 + m2v2 = (m1+m2)v3 In the LHS of our equation, we have two systems. m1 and m2. But in the RHS of our equation, we use a totally different system. m3, the combination of m1...

Throughout my limited physics career (high school, first year university) I was introduced to concepts such as potential energy, kinetic energy, and work. Naturally, I was taught about potential energy using the whole gravity analogy. A brick at height h has more potential energy than a brick...

Urgent help required! I need to simulate a rolling non-rigid tyre on a ground with obstacle(s). How should i proceed with ansys 14.5? Any help will be deeply appreciated.

I didn't know where to post this, but, this video makes my eyes water.

Homework Statement Find the acceleration of both blocks Homework Equations Dynamics The Attempt at a Solution Everything in black is given in the problem. The red/blue is my work. First I want to relate the acceleration of block A to block B by finding the constraint equations: Lrope = 2L1...

I tried searching the web for this topic but got an answer like "formulae used in classical mechanics are approximations or simplifications of more accurate formulae such as the ones in quantum mechanics and special relativity". My question is that why do the laws of Sir Isaac Newton no longer...

I'm trying to finish my physics homework and one of the questions is somewhat philosophical. Problem: A cannon ball is shot at noon (12pm), what is faster? The cannon ball or its shadow? That's all the question is :p

Homework Statement Determine the speed of a fluid particle at the origin and at a point (1,-2,0) for each of the following velocity fields when t = 2s. All distances are in meters and t is in seconds. V = (x+2)i + xtj - zk m/s Homework Equations V x dr = 0 dV/dt = u(dV/dx) + v(dV/dy) +...

Me and my friends have been trying (b) for soooo long! we have gone to PhD students and some fluid dynamic doctors for held and they cannot figure this out. 1. Homework Statement 2) This question concerns the design of a ‘micro-chemostat’ device. E. coli exhibiting chemotaxis can swim up to...

As a non-physicist, what little I have learned about Shape Dynamics theory is appealing to me in many ways. http://arxiv.org/abs/1105.0183 I offer this link as a starting point for the discussion, but I'm curious if there has been any further progress in the professional and/or academic ranks...

Homework Statement [/B] A belt moves over three pulleys at a constant speed v0 [ft/s]. Knowing that the normal component of the acceleration of the portion of the belt in contact with pulley B is aB,n=90 [ft/s2 ]. Determine: (a) speed of the belt, v0 [ft/s], and (b) normal component of the...

I need help with my dynamics homework. This is what I have so far, I hope you can read my writing (let me know if something is unclear). Can someone help me with how to approach this problem and where to go next? Thank you!

hello I am interested to know in detail, how internal combustion engines work dynamically, ie. as the demand for speed and torque change what happens exactly? I know that when we want more speed/torque, we push the gas pedal, but what happens exactly between that moment and the increased rpm...

Homework Statement "Inverted siphons were used by the Romans to cross some valleys. If the height difference between the top of the valley and the bottom is 10 meters, the pressure in the pipe at the bottom of the valley will be ____. Homework Equations Bernoulli's Equation P1+(pv^2)/2 + pgh1...

Hi guys I am looking for help with some formulas, its for hnc mech eng, the question is as follows a winding drum with moment of inertia 24 kg m2 and a winding radius of 0.6m is used to accelerate a loaded hoist with mass of 850kg at a rate of 0.8ms by means of a cable, frictional resistance can...

Homework Statement (a): Show the lagrangian derivative in phase space (b)i: Show how the phase space evolves over time and how they converge (b)ii: Find the fixed points and stability and sketch phase diagram (c)i: Find fixed points and stability (c)ii: Show stable limit cycles exist for T>ga...

I am doing a physics project whose purpose involves describing the physics behind a toy. The toy I have selected is a "decision maker" which is composed of a pendulum which has a magnetically charged ball on it that swings side to side, while having a force exerted on it by magnets which change...

1. The problem statement, all variables and given/known data An elevator(4850kg) is to be designed so that the maximum acceleration is 0.068m/s2. What are the minumum and maximum forces the motor must exert on the supporting cable? 2. Homework Equations Force = mass(acceleration) Forcevertical...

Homework Statement *Note: I'm really stuck in this part of Newton's 2nd Law so I may be asking a few more questions after this to practice for our upcoming examinations. A cable supporting a 2125kg elevator has a maximum strength of 21750N. What maximum upward acceleration can it give without...

Homework Statement Here's the problem: A particular racecarcan cover a quartermile track (402m) in 6.40s starting from standstill. Assuming that the acceleration is constant, how many "g's"(all i know is that it means accleration due to gravity) does the driver experience? If the combined mass...

Homework Statement the theory behind Parallel axis theorem Homework Equations parallel axis theorem:Io=Ig+md² Radius of Gyration=Ig=m*K² The Attempt at a Solution ok folks If I understand this theory correctly the radius of gyration is the radius or distance from the axis of rotation to the...

Homework Statement A 1.0 kg box on a horizontal frictionless surface is accelerated by attaching a 1.5 kg mass as shown in the diagram. What is the magnitude of acceleration of the box?(Remember, both boxes accelerate.) Homework Equations F = ma The Attempt at a Solution I drew a free body...

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)...