What is Dynamics: Definition and 1000 Discussions

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. J

    How can I solve a dynamics problem involving a pulley, rod, and rotating masses?

    Homework Statement There is pulley which has a mass hanging from one side, and a rotating rod attached horizontally to the other (both by cables). The pulley has mass; Mp = 9.5kg and radius; Rp =0.2m. The block(A) has mass; Ma=10.9kg. The rod is L = 0.8m long and has mass=Ml7.9kg. The rod is...
  2. J

    Modeling Population Dynamics of Flies, Frogs, and Crocodiles

    Homework Statement Flies, frogs, and crocodiles coexist in an environment. To survive, frogs need to eat flies and crocodiles need to eat frogs. In the absence of frogs, the fly population will grow exponentially and the crocodile population will decay exponentially. In the absence of...
  3. D

    Dynamics- acceleration of beam on rollers

    1. Homework Statement 2200kg beam is sitting on two rollers spaced 2m apart. rollers weigh 1200kg and have radius of .35m. the block is pulled to the right with 4000N. there is no slippage. find the acceleration of the system (answer given is one of the rollers). 2. Homework Equations I...
  4. A

    What Governs the Dynamics of Phase Transitions in Materials?

    I'm merely starting to research this field. Phase transitions have always been a mystery for me. Which kinds of dynamics govern when a material will undergo a phase transition? e.g., why is it exactly at the temperature T0 and pressure p0 that the substance X goes from one phase to the other...
  5. H

    Dynamics- Net Gravitational Force

    Homework Statement In a particular binary star system, Star A has a mass that is 28 times that of Star B. This distance between the stars is 34 AU (astronomical units). Find the location of the point in this star system where the net gravitational force on any mass would be zero. Homework...
  6. H

    Archived Dynamics- Two Body Problems

    Homework Statement Two blocks are stack on each other. The lower block has a mass of 6.8kg and μs=0.34 with the floor. The top block has a mass of 3.4kg and μs=0.65 between the two blocks. A force of 18N is being applied to the top box to the left. What maximum force can be applied to the...
  7. A

    Dynamics - supertanker coasting to a stop

    Dynamics -- supertanker coasting to a stop 1. Problem Assuming constant negative acceleration, how far does a supertanker of a mass of 250000 metric tons travel while coasting to a stop from an initial speed of 30 km/h in 21 min? What force is supplied by fluid friction of the water while the...
  8. C

    Help with Gas dynamics problem

    Homework Statement for a weak shock wave (p2-p1)/p1=epsilon show that (s2-s1)/cv=(gamma^2-1)epsilon^3/(12*gamma^2)+higher order terms HINT: it is helpful to subtract this equation [p]/<p>+gamma[v]/<v>=0 from the equation [ln p(v)^gamma]=[s]/cv before expanding in terms of epsilon...
  9. J

    Dynamics Question Involving two blocks on a plane

    Homework Statement http://i.imgur.com/K2hYHgq.png Picture here with question. Homework Equations F=ma The Attempt at a Solution For the system to begin moving, a>0 therefore Fnet>0 I drew some FBDs and came up with four relevant forces total; the force of gravity along the...
  10. K

    Dynamics - Using the coefficient of friction

    Homework Statement You are to lower a safe of mass 260kg at constant speed downs skids 20.0m long, from a truck 2.0m high. a) If the coefficient of friction between the safe and the skids is 0.25, do you need to pull the safe down or hold it back? b)How great a force parallel to the skids is...
  11. K

    Dynamics Question: Calculate Resistive Force on Car

    Homework Statement Along a certain section of road a car (mass 1600kg) will coast in neutral at a constant speed of 72 km/h if there is no wind. Examination of a topological map shows that for this section of road the elevation decreases by 200m for each 6000m of road. What is the total...
  12. P

    Solve Acceleration of Inclined Plane Given z,P,A

    Homework Statement a mass z is held on an incline plane with mass P. when the the masses are released, both objects begin to move and accelerate. find accell of the incline plane GIVEN: z,P,angle A, surfaces are frictionless solve in terms of these variables. Homework Equations f=ma...
  13. S

    Dynamics vs Thermo Fluids for EE

    Hello all, I'm choosing my classes for spring semester and am unsure about which of these two classes I should pick (topic title). My major is electrical engineering and I want to hopefully go to graduate school at my current school for their micro-systems nano-systems program listed here (...
  14. H

    How Do You Calculate Normal Force with Angles and No Friction?

    Homework Statement Find the normal force in terms of g, m, θ and α. There is no friction. a=0, θ≠α See first attachment for diagram Homework Equations Fx=max The Attempt at a Solution I drew a free body diagram including the forces; normal, mg, and |FA| (See second...
  15. H

    Dynamics and Friction: Solving for Maximum Angle on a Ramp with μ_{s}=0.25

    Homework Statement A box is halfway up a ramp. The ramp makes an angle, θ with the ground. What is the maximum value of θ before the mass will slip? μ_{s}=0.25 Homework Equations F_{x}=ma_{x} The Attempt at a Solution I drew a free body diagram to show the forces affecting the box...
  16. H

    Solving Dynamics-Friction for Max θ w/ μ_s=0.25

    Homework Statement A box is halfway up a ramp. The ramp makes an angle, θ with the ground. What is the maximum value of θ before the mass will slip? μ_{s}=0.25 Homework Equations F_{x}=ma_{x} The Attempt at a Solution I drew a free body diagram to show the forces affecting the box...
  17. alane1994

    MHB Population Dynamics: Solving Differential Equations for (a), (b), and (c)

    Suppose that the population of a species of fish in a certain lake is hypothesized to grow according to a logistic model of population growth with growth rate \(r=0.3\) and carrying capacity \(k=3000\). Assume initially there are 2500 fish of the species in the lake. Determine the correct...
  18. S

    Linear Dynamics Help: friction and horizontal force

    Homework Statement I've been having some problems trying to do a few lab questions for my physics class, I'm not very good at it but I do try to make the best of it so anyone that's willing to help me give me any pointers would be awesome. I have two physics problem and I'm supposed to do them...
  19. M

    How much math for fluid dynamics?

    hey all im taking a graduate level fluid mechanics course. we are using a good amount of vector calculus (expected) and also tensor algebra, leading into the kronecker delta and Levi-Civita symbol (shockingly never saw these before, though implicitly used them). it seems linear algebra is...
  20. P

    Centripetal force problems for dynamics

    Centripetal force problems for dynamics :) Homework Statement I have two questions! 1. You are driving at a speed of 60.0km/h around a turn with a radius of 75m. The coefficient of friction between the tires and the road is 0.85. a. After traveling 20° around the turn, you hit a...
  21. maistral

    Process dynamics modelling for heated tank, differential equations

    I can't seem to model this properly. This isn't an assignment, I'm just curious how this will go, lol. So I have this tank with an incoming feed stream with temperature Ti, and an output stream T. It has a jacket where q would be modified depending on the desired output stream T. So I...
  22. F

    Highschool Dynamics Lab. Consistency problem?

    Homework Statement There is a box pulled up a ramp at an angle, θ via a pulley system with a mass m1 at the end, accelerating downward under the influence of gravity and tension in the rope connected to the box. The goal is to find the coefficient of kinetic friction between the leather bottom...
  23. Ascendant78

    One-dimensional dynamics question

    Homework Statement A 60kg student lowers herself down 40m at a constant speed of 1.0 m/s. The chair has a mass of 35kg. Find the force of the rope. (See image) Homework Equations I was using force equations in attempts to solve for the problem. The Attempt at a Solution...
  24. M

    Can someone please check my homework on fluid dynamics?

    Hi there, I just would like if someone could check over my work on my current homework assignment involving fluid dynamics. Homework Statement 1) Calculate the absolute pressure at an ocean depth of two kilometers. Assume the density of seawater is 1000 kg/m3, the density of air is 1.3...
  25. Ascendant78

    Question regarding basic dynamics and forces involved?

    Homework Statement "A 60kg student lifts herself from rest to a speed of 1.5m/s in 2.1s. The chair has a mass of 35kg." All information is included in the accompanying image. In short, it is a basic kinematic and dynamic equation. Currently, we are only working on problems that involve...
  26. A

    Can Like-Charged Particles Be Confined Without Excessive Force?

    Hi, I've been toying with a thought experiment, and I was wondering if it had any basis in reality. Is it possible to confine like-charged particles (e.g., primarily positive or primarily negative) to a particular space? After doing some searching, I stumbled upon "non-neutral plasmas", which...
  27. Ascendant78

    Basic question regarding dynamics concepts?

    I just started Physics 1 this semester. Although the kinematics we covered so far were simple, our teacher didn't do a particularly good job at explaining dynamics. In fact, all 10 students I talked to were left clueless by his lecture. What we don't understand at this point is the concept...
  28. U

    Dynamics trajectory motion help

    Homework Statement "In a movie scene involving a car chase, a car goes over the top of ramp A and lands a B below. Determine the speed of the car at A if the car is to cover distance d=180ft for \alpha =15° and \beta = 30°. Neglect aerodynamic effects. Homework Equations Word.doc is the...
  29. M

    Fluid Dynamics - Calculate the resultant moment

    Homework Statement A rigid vertical wall separates two liquid reservoirs. The first reservoir contains oil of density p=864 kgm-3 at a height of 6m above the ground, while the second reservoir contains water (1000kgm-3) at a height of 5m from the reservoir bottom. Calculate the resultant...
  30. S

    Analyzing Dynamic Orbits: Tension, Speed, and Angular Momentum Calculations

    Homework Statement A ball of 10kg mass is suspended by a cable that passes through a hole in a floor. The ball rotates in a circular orbit, A, that is in a plane that is 3m below the floor. If the orbit has a radius of 1m, calculate; a) Tension in the cable b) speed va of the ball in...
  31. T

    Can Rotational Dynamics be derived from Translational Dynamics?

    Torque, in particular, is always a concept that has confused me. Can the rules related to torque be derived or are they natural tendencies? (For lack of a better way to phrase this). For example, if I were trying to solve the problem of a ladder leaning against a frictionless wall, where I...
  32. E

    Dynamics in Two Dimensions Question

    Homework Statement During baseball practice, you go up into the bleachers to retrieve a ball. You throw the ball back into the playing field at an angle of 42° above the horizontal, giving it an initial velocity of 15 m/s. If the ball is 5.3 m above the level of the playing field when you...
  33. C

    Developing an Intelligent Tutoring System for Vehicle Dynamics

    Hello everybody, I am looking for some help from Native english speakers (or otherwise extremely good speakers), for a bulletproof grammar review for a research paper. The paper is about education and automotive engineering, so context is important and so the reason I post it here. If...
  34. G

    Good introductory textbook for L & H dynamics?

    I'm a high school grad, my knowledge of college level physics is quite rudimentary. I would like to start learning about L & H dynamics. What textbook would you guys recommend for novices?
  35. D

    Phase-plane dynamics of an atomic force microscope cantilever.

    Hello, A sinusoidally driven and undisturbed cantilever of an atomic force microscope (AFM) oscillates ideally in a sinusoidal fashion but the motion of the cantilever (time-domain trajectory) can become more complicated when it is disturbed by the inter-atomic forces as the cantilever taps...
  36. D

    Classical Dynamics of Particles & Systems

    This is an image of Classical Dynamics of Particles & Systems, chapter 1 In deriving the equations for the rotation of a coordinate system I understand the equations 1.2a & 1.2b b, but why is the projection of x2 on the x'1 equal to ab +bc and why is the vector de equal to the vector Of? I...
  37. E

    Engineering Master in Maths seeking engineering job in Fluids Dynamics area

    I did BA Maths at Cambridge with a First Class back in 2009-12, worked in i-banking for one year (partially because I need to fund my graduate study) and will continue with a Master in Maths at Cam this coming autumn. My courses had been (and will continue to be) concentrated in Fluid Dynamics...
  38. E

    How Does Elevator Motion Affect Work Done by Forces?

    1. Homework Statement the question is: A 62 kg person in an elevator is moving up at a constant speed of 4.0 m/s for 5.0 s. T / I C (b) Calculate the work done by the normal force on the person. (c) Calculate the work done by the force of gravity on the person. (d) How would your...
  39. C

    Dynamics - relative motion, planes Q

    Homework Statement Aircraft A is describing a circular flight path in an anti-clockwise direction at 125km/h Aircraft B is flying the same path but in the opposite direction at 225km/h. If the radius of the flight path is 5km, calculate the acceleration of A relative to B when Aircraft A is...
  40. J

    System Dynamics: A Qualitative Understanding

    I did read some of the posts on the topic. However, I just want to check my qualitative understanding without employing too much mathematical dynamics. If anyone has some feedback, this would be much appreciated. The System. A spring hangs vertically. There is a mass attached to it...
  41. A

    Rotational Dynamics / Moment of Inertia Question

    Homework Statement An oxygen molecule consists of two oxygen atoms whose total mass is 5.3x10^-26 kg and whose moment of inertia about an axis perpendicular to the line joining the two atoms, midway between them, is 1.9 x 10^-46 kg*m^2. From this data, estimate the effective distance between...
  42. P

    [Difficult] Gas Dynamics Situation

    Hoping someone finds this problem interesting, I'm looking for some ideas on how to solve a real world problem, not a complete and detailed solution. This topic is related to an astrophysical situation. However, I prefer to present it just as a question on gas dynamics since there's no need for...
  43. A

    Can the Radius of a Disk Affect the Inclined Plane Experiment Results?

    Hi there I was wondering if someone can help me on this attachment I am stuck on question 1.3 and 1.4. This was an experiment to see relationship between sin and gradient I have confidently completed the first two questions but it is the last two questions which are troubling with I am finding...
  44. J

    Three masses, pulleys, dynamics, and tension (Please help)

    Homework Statement there are three masses m2 is on a table top with coefficient of friction of 0.350 with two different masses on each side. They are connected by a mass-less string and friction-less pulley m1=4kg m2=1kg m3=2kg 1.]find the acceleration of all three masses...
  45. 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...
  46. 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: -...
  47. 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...
  48. 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...
  49. 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...
  50. 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...
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