Dynamics Definition and 1000 Threads

General Dynamics Corporation (GD) is an American publicly traded, aerospace and defense corporation headquartered in Reston, Virginia. As of 2020, it was the third-largest defense contractor in the United States, and the third-largest in the world, by sales. The company is a Fortune 100 company, and was ranked No. 83 in 2020.Formed in 1954 with the merger of submarine manufacturer Electric Boat and aircraft manufacturer Canadair, the corporation today consists of ten subsidiary companies with operations in 45 countries. The company’s products include Gulfstream business jets, Virginia- and Columbia-class nuclear-powered submarines, Arleigh Burke-class guided-missile destroyers, M1 Abrams tanks and Stryker armored fighting vehicles.
In 2020, General Dynamics had worldwide sales of $37.9 billion and a workforce of more than 100,000 full-time employees. The current chairman and chief executive officer (CEO) is Phebe Novakovic.

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  1. L

    Help Solving Dynamics Problem: Skier Coasting Down Hill

    I'm studying for my exam and I don't understand the solution to a problem. I hope someone could help. It's actually for Dynamics. problem: A skier coasts down a hill without initial velocity. The slope is at angle α = 30° with respect to the horizon from p. A to p. B. From p. B to p. C the...
  2. F

    Dynamics Physics - Acceleration Analysis / Gear Ratios /

    First time posting. Homework Statement Gears A and B, of Masses 4kg and 10kg, respectively, are rotating about their mass centers. The radius of gyration about the axis of rotation is 100mm for A and 300mm for B. A constant couple of C=0.75Nm acts on gear A. Neglecting friction, compute: -...
  3. Physics Monkey

    Dynamics in non-commutative geometry models

    I was reminded of this point by a recent discussion in the "Classification of manifolds ..." thread. The question is this: As I understand it, the NCG framework requires a Riemannian manifold. Given this, at best one could hope to obtain a Euclidean theory, right? So is it fair to say...
  4. andyrk

    Accelerating Wedge and block on top of it -- Dynamics

    Homework Statement In the figure a block of mass 'm' is placed on a wedge of mass M. The wedge is subject to a horizontal force 'F' and slides on a friction less surface. The coefficient of static friction between the block and wedge is μs. Find the range of values of 'F' for which the block...
  5. A

    What is the motion of the block when released from a compressed spring?

    Homework Statement The 15.8-in. spring is compressed to a 7.1-in. length, where it is released from rest and accelerates the sliding block A. The acceleration has an initial value of 160 ft/sec2 and then decreases linearly with the x-movement of the block, reaching zero when the spring...
  6. A

    Constant Acceleration; Dynamics

    Homework Statement Problem: Calculate the constant acceleration a in g’s which the catapult of an aircraft carrier must provide to produce a launch velocity of 188 mi/hr in a distance of 299 ft. Assume that the carrier is at anchor. Homework Equations V^2 = 2AD The Attempt at a...
  7. bohm2

    De Broglie dynamics fine/Bohmian dynamics untenable?

    An interesting paper within the pilot-wave camp by Colin/Valentini arguing in favour of de Broglie dynamics over Bohmian mechanics: Instability of quantum equilibrium in Bohm's dynamics http://lanl.arxiv.org/pdf/1306.1576.pdf
  8. N

    Archived Nonlinear Dynamics and Chaos, Strogatz: 2.1.5

    Homework Statement a) Find a mechanical system that is approximately governed by \dot{x}=sin(x) b) Using your physical intuition, explain why it now becomes obvious that x*=0 is an unstable fixed point and x*=\pi is stable. Homework Equations \dot{x}=sin(x) (?) The Attempt at a Solution...
  9. N

    [Fluid dynamics] Normal shock wave problem

    Homework Statement Air, supplied by a reservoir at 450 kPa, flows through a converging-diverging nozzle whose throat area is 12 cm^2. A normal shock stands where A1 = 20 cm^2. (a) Compute the pressure, p2, just downstream of this shock. Still farther downstream, where A3 = 30 cm^2, estimate (b)...
  10. B

    [DYNAMICS] Acceleration as a function of position.

    Homework Statement Initial velocity = 17 m/s Radius of curvature = 13 m Acceleration as a function of position = -0.25s m/s^2 Time elapsed = 2 s Solve for the magnitude of the acceleration. Homework Equations a = v (dv/ds) a^2 = a(t)^2 + a(n)^2, wherein a(t) is tangential...
  11. N

    Where do I fit? Nonlinear Dynamics and Chaos, and High Energy Physics

    Hello all, My question is really simple. I really like working on problems that involve Nonlinear Dynamics and Chaos, and I also really enjoy fields of Theoretical Physics that probe the nature of reality (quantum mechanics, high energy & elementary particle physics, string theory, etc.) I...
  12. N

    Newtons law Dynamics Question 4

    Homework Statement Determine the acceleration of a 10kg block traveling up a ramp connected by a massless string and massless pulley to another block that is 5kg and in free-fall. if the coefficient of kinetic friction between the block and the ramp is 0.2 (The diagram shows one block...
  13. N

    Newtons laws, dynamics questions

    Homework Statement 1) A 1000-kg Car is parked on a 10 degree slope. Determine the magnitude of the frictional force acting on the car 2) A 2000-kg car traveling at an initial speed of 10m/s skids to a stop with a constant acceleration. The coefficient of friction between the tired and the...
  14. W

    Photo-Generated Carrier Dynamics?

    I'm going to be working on a research project for an internship that involves photo-generated carrier dynamics, and after looking up the topic for a while, I haven't been able to find a source that explains what it is/means. I'd appreciate if anybody could take a minute to explain this concept...
  15. A

    What is the velocity of the COM of a falling rod at a given angle?

    Homework Statement Given a rod of length 'l' placed upright on a smooth floor.A slight disturbance causes it to fall.Now required is the velocity with which the COM falls down when the rod makes angle θ with horizontal. The Attempt at a Solution now let the middle portion of the rod be...
  16. Z

    Model Reduction and Substructuring in Dynamics, CMS

    Dear engineers and physicists, I would like to ask you a question about Component Mode Synthesis (CMS), which is the topic of my bachelor thesis. My primary resource is the classical AIAA article "Coupling of Substructures for Dynamic Analyses: an Overview" by Prof. Craig. For now I am...
  17. L

    Inverse Dynamics - 2 Rigid Bodies connected with hinge

    I am trying to simulate and animate inverse dynamics. So I need to calculate torques. I started out by just taking a rod which rotates about its COM, applied a torque and then just used \tau=I\alpha to make sure I get back the same torque I applied. Next, I attached the rod to the ground with...
  18. M

    Looking for Good Fluid Dynamics Book

    I know this question has been asked plenty of times, but nonetheless I wanted to get some recommendations that might better jive with my situation than other the other threads I've read about this topic. I'm a first year grad student in physics that hasn't had a course in fluid dynamics, but...
  19. S

    Extremely confusing dynamics question

    Hi guys, this is so confusing as there are lots of assumption needed (I think). I can't do this even though I got the answer and tried working backwards. A painter in a crate which hangs alongside a building, weighs 1000N.When the painter pulls on the rope, the force he exerts on the floor of...
  20. G

    Dynamics of a particle moving in a straight line

    Hi all, Sorry if I have posted in the wrong place. I am not to familiar with the forum titles and new setting. I have an argument and this is not homework. Suppose two particles P and Q of masses 2m and m respectivily are attached to the ends of a light inextensible string which passes...
  21. M

    Incompressibility in boundary layer (Fluid Dynamics)

    I have started studying fluid mechanics recently and seems to be a very basic conceptual question that is bugging me and unfortunately I am unable to find a reasonable explanation for it. Your help would be more than appreciated. The mathematical definition for incompressiblility in fluid...
  22. R

    Programs Physics or Engineering undergraduate major: Interest Fluid Dynamics

    Currently I am intended to start next fall as a Physics major at the University of Delaware. My interest lies in Fluid Dynamics particularly in Geophysical Fluid Dynamics. I understand it's really early in my college career and I may change my interest, however I was surprised to find that as a...
  23. H

    Is Dynamics important for Fluid Mechanics?

    Hey Guys, I am supposed to take Fluid Mechanics in Fall 2013. The course has lots of prerequisites and I have taken them all. One of the prerequisites is Dynamics. In Dynamics I was taught how to analyze objects in motion using Newton's Second Law of motion, Work and Energy method and...
  24. J

    Fire dynamics simulator, making obstructions

    hey all, Is there any easy way to make obstructions in FDS that aren't rectangular? I basically want to tack on a circular chimney to the following the chimney would be circular, and inscribed in the square. then, there'd be a circle inside of it, making the chimney have 10" thick walls...
  25. A

    A Dynamics Problem Regarding Friction.

    Homework Statement That was the given information. Here are the questions they ask, I have solved a) and b), but I am completely stuck on c). I'll just put them here in case information from them are necessary. a) What is the coefficient of static friction between the 5.0 kg mass and the...
  26. S

    Dynamics: Forces at 90 and 45 degrees

    Homework Statement Hi, I have a system of forces which is showed in the following picture: http://imageshack.us/photo/my-images/197/fuerzas.JPG/ The exercise says: A force F produces an acceleration of 5 m/s^2 when it acts on a particle of mass m. Calculate the acceleration of the particle...
  27. R

    MHB Fluid Dynamics in Action: (Mechanics)

    Viscous fluid flows between two rigid boundaries at y=0, y=h, the lower boundary moving in the x direction with constant speed U. The upper boundary is at rest. The boundaries are porous and the vertical velocity is V (constant) at each one...
  28. F

    Understanding Bernoulli's Principle in Fluid Dynamics: Quick Question Answered

    I understand everything up to B). I believe Bernoulli's is applicable here, however I am unsure as to whether or not the pressure before the tube (pgh) is the same or different as the pressure at the tube pgh +p0. I ask the same question for the opposite end of the tube. I know that pressure...
  29. M

    Angular Dynamics: 150Nm, 75rpm, 9 & 23 Revs. Determine Inertia & Friction

    A constant torque of 150Nm applied to a turbine rotor is sufficient to overcome the constant bearing friction and to give it a speed of 75rpm from rest after 9 revolutions. When the torque is removed, the rotor turns for a further 23 revolutions before stopping. Determine the moment of inertia...
  30. A

    Finding Displacement, Velocity, and Acceleration in a Viscously Damped System

    Homework Statement A viscously damped system has a total weight of 250 N, a spring stiffness k = 8 kN/m, and a damping coefficient c = 0.08 kN-sec/m. Determine the displacement, velocity, and acceleration of the mass as a function of time if it is disturbed from its equilibrium position...
  31. D

    Cam Follower Reaction Forces in Accelerating Roller Cart

    Homework Statement Cam followers are 25mm and 32mm in diameter. Mass is 4kg. Determine the reaction forces on all of the cam rollers when cart accelerates to the right at 20 m/s^2 Homework Equations The Attempt at a Solution (4kg)(20m/s^2)(.05m)/(.018m) = 222 N on small roller...
  32. 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...
  33. A

    Dynamics, Newton's laws, Problem with free body diagram and work

    Homework Statement A boy skateboards down a curved playground ramp. If we treat the boy and his skateboard as a particle of total mass m = 25:0 kg, he moves through a quarter-circle with radius R = 3:0 m. He starts from rest at point A and there is no friction. (a) Find his speed at the...
  34. C

    Dynamics of Rotational Motion: Quarry Crane Problem

    Homework Statement A quarry crane is used to lift massive rocks from a quarry pit. Consider the simplified model of such a crane shown in the figure. (Figure 1) The ends of two poles are anchored to the ground at the same point (point O). From this point, one pole rises vertically and the...
  35. F

    Minimum Applied Force for Block and Cart Dynamics Problem

    Homework Statement I've solved it already, I think. I'm just not sure about the result. There is a block (B), which is touching a cart (C) on one side. Let an external force, parallel to the surface, ##\vec{F_a}## be applied on B mass of B = m; mass of C = M; static friction...
  36. F

    Troubles with a Dynamics exercise

    Homework Statement Two carts (1&2) on a flat surface, are pushed by an external force (##\vec{F}##), exerted on 1 (the carts are motionless and touching each other). Consider the two objects as particles and take no notice of any friction. F=12N; mass of 1 (##m_1##)=4,0 kg; mass of 2...
  37. J

    Understanding Rotational Motion: Solving for Linear and Angular Acceleration

    Homework Statement Consider a sphere that is placed at a table. The coefficient of kinetic friction between the sphere and the table is μ. At time t = 0, the velocity of the center of mass of the sphere is Vo = 0, and the sphere is rotating with respect of the horizontal axis with angular...
  38. sergiokapone

    Rolling Dynamics of a Rotating Cylinder on an Inclined Plane

    Homework Statement Rotating with angular velocity ##ω_0## solid homogeneous cylinder of radius ##r## placed without starting forward speed at the bottom of the inclined plane, forming an angle ##\alpha## with the horizontal plane, and starts to roll in up. Determine the time during which the...
  39. M

    How Is the Driving Torque Calculated for a Hoist Drum in Rotational Dynamics?

    A mine cage of mass 4 tonne is to be raised with an acceleration of 1.5m/s^2 using a hoist drum of 1.5m diameter. The drum’s mass is 750kg and its radius of gyration is 600mm.The effect of bearing friction is equivalent to a torque of 3kNm at the hoist drum. What isthe driving torque required...
  40. D

    How Does a Seat Belt Protect You in a Crash?

    Homework Statement In a test of a car seat belt system, a dummy of mass 55kg in a car seat is accelerated to a speed of 35m/s before it hits a brick wall. The seat belt allows the dummy to move forward relative to the seat by a distance of 0.60 m. Calculate, (a) The deceleration of the dummy...
  41. J

    What is the Volume of Water Leaving a Tank Through a Rectangular Opening?

    Homework Statement 5. A rectangular opening on the side of a water tanks has a width of L. The upper part of the opening it's in a height of h1 underneath the water y and the bottom part it's in h2 . prove that the volume of water that leaves the tank is given by : 2/3(L)√(2g(h1³-h2³))...
  42. D

    What are the forces acting on a boat crossing a still lake at a constant speed?

    Homework Statement Hi could some one point me in the right direction for both parts of these questions, I am electrical biased so this is all new to me. A model boat off mass 25 Kg is crossing a still lake at a constant speed, in a straight line. The engine is propelling the boat along...
  43. C

    What Is the Linear Acceleration of the Hoop in a Pulley System?

    Homework Statement An green hoop with mass mh = 2.6 kg and radius Rh = 0.12 m hangs from a string that goes over a blue solid disk pulley with mass md = 2.3 kg and radius Rd = 0.09 m. The other end of the string is attached to a massless axel through the center of an orange sphere on a flat...
  44. O

    Water Wavemaker calculation need. fluid dynamics help.?

    Hi guys, I haven't taken any physics classes or any of the sort to figure out the problem that I am faced with. basically what where creating is a wave maker like this (sorry this is the only video i found) basically the "float" that you see is shaped like a quarter of a circle...
  45. jaumzaum

    Rotational dynamics - direction of friction

    I'm studying rotational dynamics and I've got a couple questions I can't answer. I want to describe de movement of the bodies in the cases below, the coefficient of friction in all the cases is \mu . I will say what I think it would happen, and I would appreciate if you guys judge it right or...
  46. T

    Fluid Dynamics 2 Tynea: Unsolvable Pipe Network Problem?

    Homework Statement A professor gave a pipe network problem to be solved by the Hardy-Cross method. However when I attempted to create a scale drawing of the figure to get a better idea of the problem I realized it is physically impossible to create his design. Now i am wondering if because...
  47. Q

    Using Advanced Dynamics to find the Force Applied of a Truck

    Homework Statement A car is moving at an acceleration such that a 5kg block in the back of the remains still on a ramp at 35*. The ramp is frictionless, whereas the coefficient of friction between the truck and the road is μ=0.1. If the truck weighs 12000kg, what is the force the trucks...
  48. C

    Dynamics Problem (suitcase pulled across floor find Fn)

    Homework Statement At the airport, you pull a 20 suitcase across the floor with a strap that is at an angle of 42° above the horizontal.Find the Normal Force. Homework Equations The Attempt at a Solution I have broken it down into all equations with just variables trying so...
  49. A

    Determining the Dynamics of a Robot Arm

    Homework Statement Here you are supposed to perform system identification to determine the parameters required later to perform model compensation in your PD control loop. The dynamic model of this single joint manipulator has the form τ = Ia + Bv + G(x), where a is angular acceleration...
  50. N

    How can I calculate the depth of bullet penetration in different materials?

    Hey guys; I am new to the forums. I am an effects artist who's working a Rigid Body Dynamics project and I may be able to use some of you guys' expertise while I'm building these simulations. As I stated above, I'm doing R&D for a deformation system I'm working on. What I want to do is...
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