What is System: Definition and 1000 Discussions

A system is a group of interacting or interrelated elements that act according to a set of rules to form a unified whole. A system, surrounded and influenced by its environment, is described by its boundaries, structure and purpose and expressed in its functioning. Systems are the subjects of study of systems theory.

View More On Wikipedia.org
Recent contents Top users
  1. AotrsCommander

    I Where does the Sol system lie in the cross-section of the Orion Spur?

    So, I know that Sol lies roughly in the 25 000 light years from the core and from the edge of the galaxy and thus the approximate the position when seen from "above." But what a search today has not given me any idea of is where Sol is (thought/estimated to be) in relation to, well...
  2. G

    To find the reaction in a system at a ring

    Could I ask for a hint as to where to go next with this question please? I've done this first part, to find the reaction on the wall. Here's my diagram: I've labelled the internal forces at B in red. In green I've shown the reaction at the ring. So I need to find sqrt(Rx^2 + Ry^2) = R. So...
  3. G

    To find the forces acting in a system in equilibrium

    Could I please ask where I have gone wrong with my reasoning in the following question: The answers in given in the book are: (1/2)W tan(Ө) W vertically (1/2)W tan(Ө) horizontally Here is my diagram: Considering the system as a whole: (In the text below "Ya" and "Xa" are the forces at...
  4. P

    B Can I hold down more than my body weight on a 1 to 1 system?

    Can you pull down/hold more weight than your body using your muscles? Imagine a 1 to 1. One side is suspended 190 pounds, the other is me, 175 pounds. Can i, using my muscles and standing on the ground, hold that suspended weight off the ground? I understand if i lock out my arms and...
  5. H

    How to calculate water pressure drop in cooling tower piping system?

    When calculating water pressure drop in chilled water pipisystem (closed circuit) we always use Hazen Williams equation as follow:- but in case of calculating water pressure drop in cooling tower piping system (open circuit), shall we modify something in Hazen Williams equation or shall we use...
  6. NTL2009

    Please help explain this Blood Pressure Monitor 'calibration' system

    I've wanted to check the accuracy of my Blood Pressure Monitor (BPM) (an automated Omron unit), and finally found this old (2016) thread on another site (linked below). Prior to this, I only found the less helpful 'compare the reading to your Doctor's office' (BP varies with every reading, not...
  7. shivajikobardan

    Comp Sci 1 example of information system in real life?

    I am studying IS but I am yet to find an example of IS. Is database IS? Is expert system IS? What is example of IS? And this question came to me while studying about this issue-: is security policy same as security methods? justify your argument with appropriate example of Information system...
  8. shivajikobardan

    Comp Sci Not getting anything in this subject Information system-:

    no resources to study except 2 slides and 1 badly written unauthentic book. Teacher was extremely bad. He just read one of those slides. But no complains. It is pretty normal where I live. I am not getting an overview of what are these slides trying to tell to me. Application control means...
  9. H

    Determine all the solutions of the system

    (I don't know how to make augmented matrices in latex, so what I would do is to use an equal to sign) $$ \begin{bmatrix} 5 &2&-6&2 \\ 1&-1&1&-1 \\ \end{bmatrix} = \begin{bmatrix} -1\\ -2\\ \end{bmatrix}$$ ## R_1 \to R_1 +2R_2## $$ \begin{bmatrix} 7 &0&-4&0\\ 1&-1&1&-1\\ \end{bmatrix} =...
  10. L

    A satellite in orbit in a system with one planet and two moons

    1) Considering the forces on one of the moons, I have: ##\frac{GMm}{(10R)^2}+\frac{Gm^2}{(20R)^2}=m\frac{v^2}{10R}\Leftrightarrow v=\sqrt{\frac{G}{10R}(M+\frac{m}{4})}.## 2) Considering the initial situation in which the satellite is at rest on the surface of the planet...
  11. Cerenkov

    B Questions about Lagrange points in the Pluto / Charon system

    Hello. With the recent interest in the JWST orbiting at the L2 Lagrange point of the Earth - Moon system, I was wondering about the dynamics of the Pluto - Charon system. Specifically, the barycentre of that system. This barycentre lies at a point in space between these two bodies. Does...
  12. W

    I A System is the transfer of energy between two mediums?

    Can a system be defined as the transfer of energy between two mediums? An example of this approach is the Rankine cycle for a power plant (water and steam cycle) This cycle would be defined by four systems. System 1 (boiler feed pump) Energy released by boiler feed pump…...Energy added to...
  13. V

    B CDC International 4 Level Travel Notice System Math Calculations

    The 4 level system categorizes international destinations at a level four if the 28 day infection rate per 100,000 > 500. The population of Costa Rica is 5,094,000. The WHO had 5,488 infections for 2/11/2022. How would you calculate the infection rate per 100,000? 5,094,000 ÷ 100,000 = 51...
  14. guyvsdcsniper

    Analyzing a constraint eqn for a pulley system

    I am having trouble creating the constraint equation for this pulley system. I don't understand why the last 3 variables of the following constraint is divided by 2? Could anyone help me understand why this is?
  15. rudransh verma

    Equilibrium of Two Blocks in a Wall System: A FBD Approach

    This problem is similar to what I have done before here. I think since the system is in equilibrium, that is both bodies are at rest, net force on each should be zero. So to balance the forces in all directions we need only friction forces on each in upward direction. So the force on B due to A...
  16. hokage12368

    Equilibrium of a Non-concurrent force system

    I tried solving it but I don't know how to start because I think that the given values are insufficient. I first tried to compute for individual forces of C, D, and F but I can't their values.
  17. rudransh verma

    Double Differentiation and Acceleration in a Four Pulley System

    We can differentiate twice the y displacement with respect to time t and get the acceleration of block B. $$a_B= \frac12 m/s^2$$. But I don’t think it’s that simple.
  18. rudransh verma

    A system of two bodies and wall

    I think there is normal force from wall and applied force will balance each other but there is no counter force against mg.Both bodies will slip and fall. I am not sure.
  19. K

    I Projection postulate and the state of a system

    Quantum Mechanics, McIntyre states the projection postulate as: "After a measurement of ##A## that yields the result ##a_n##,the quantum system is in a new state that is the normalized projection of the original system ket onto the ket (or kets) corresponding to the result of the measurement"...
  20. P

    Engineering How do I use Simulink to create a control system with a 2nd order ODE?

    Equation: , where matrix D, C, G and F can be represented by I'm supposed to design a control system that looks like this: I am given that the dynamic model = fcn(D,C,G,dq) where the dq is the same as 𝑞̇ and d2q in the diagram is the same 𝑞̈. The default initial value of [𝑞(0), 𝑞̇(0)] is...
  21. rylest

    Stuck on complex pipe system bending moment hand calcs

    Some more details on the system are that L1 is very long (close to 100ft) and L2 is close to 30ft (the vertical pipes). The piping is all schedule 40 1/2" OD. Moment of inertia is roughly 10^-8. Components are about 2kg each. The distance of the pipes horizontally is small (around 2ft). Pressure...
  22. Cosmology2015

    Tension at a SPD for Solar Power System

    Hello there! I am using a Surge Protection Device (SPD) for Solar Power System. My home uses a 3-phase system (380V and 220V at each phase). What should be the tension between the phase and ground at the SPD? And between the ground and neutral? Should be any tension at all? God bless all. PS. My...
  23. sophiecentaur

    Plumbing Finding a leak in a Central Heating system (water)

    It has to be going somewhere! The boiler pressure drops by about 0.5Bar every few weeks. I've looked at the radiators for signs of small leaks but I haven't been inside the boiler as yet because I only recently terminated a maintenance contract with British Gas. BG were not interested in a leak...
  24. erensatik

    Tension in a pulley system pulled at an angle

    This problem just came to my mind when thinking on another problem. Does the tension is just 2T as it is if the angle "a" is 90 degrees? It seems not to me. In a "normal"( I don't really know what is the right word for that) situation, the tension is would be 2T at the line in the middle of two...
  25. T

    A Counting on a computing system

    It is plretty clear that a classical computer can't count over the set of natural numbers. If it is a digital device and you used an infinite loop you would eventually run out of memory space and have to reinterpret the meaning of the numbers (so it isn't really counting independently). An...
  26. Eko

    Understanding Gas Dynamics in Piston-Crank Slider System

    I need help understanding what happens to the gas that is being worked by the piston, in the crank slider. My goal is to produce linear motion on an object up to a certain height and I'm wondering since the slider moves back during the rotation of the crank what happens to the object I'm trying...
  27. Steven Ellet

    Medical Does the immune system go inside of tumors?

    Does the immune system attack diseases inside a tumor (cancerous or otherwise)?
  28. S

    Bohr radius of Earth-Sun system

    When I looked up for Bohr radius, the formula has ##q## in it, which is charge of the object. For this question, the electron and proton are replaced by sun and Earth so it means that I have to know the charge of Earth and sun? Thanks
  29. shivajikobardan

    Comp Sci Hotspots in Google File System

    In Google File System,hotspots haven't been a major issue because our applications mostly read large multi chunk files sequentially. what it mean? hotspot-: region of computer program where a high proportion of executed instructions occur Lazy space...
  30. S

    Problem of spring block system: force vs conservation of energy

    I have used the work energy theorem like all source have shown me an have arrived at the right answer where work one by all the forces is the change in kinetic energy -1/2kx^2 - umgcosΘx +mgsinΘx = 0 is the equation which becomes -1/2kx -umgcosΘ+ mgsinΘ = 0 where k= spring constant u=...
  31. brochesspro

    I The centripetal acceleration of the planets in our solar system

    Relevant formulae:- Angular velocity in uniform circular motion ##=## ##\omega## ##=## ##\frac {2\pi} t##, where ##t## is the time taken to complete one revolution. Centripetal acceleration in uniform circular motion ##=## ##a## ##=## ##\omega^2r##, where ##r## is the radius of the circular...
  32. H

    Trouble understanding the influence of a real spring in a system

    The hypothesis is that the force of a real spring can be described as $$F = -kx + \alpha x^2$$ with x being the spring deformation and k its constant. The \alpha x^2 would be the force lost by the spring as x becomes too big. To test that, a system was build with block of mass m suspended by a...
  33. M

    Dynamical Systems - Chaos: Stability condition for a 2-cycle system

    Hi, (This question is part of the same example as a previous post of mine, but I have a question about a different part of it) I was looking at a question from an exam for a course I am self-teaching. There is a sub-question which asks us to find the values of a parameter for which the 2-cycle...
  34. G

    B Exploring the History of Calculating Solar System Body SGPs

    does anyone have a good reference on the history of calculating the standard gravity parameters of solar system bodies? My guess is a rough estimate of Jupiter's SGP can be gained from observing the motion of its moons, in which case the first estimates could have been made soon after Newtonian...
  35. downeast

    Order of calculations for an air bubble system for dock de-icing

    My current project involves constructing an air bubble system to protect stationary docks from ice heave or ice jacking during the winter months. Ice jacking is the vertical lift as ice expands. When this grabs piles supporting stationary docks, it can wreak havoc. I am mainly confused as to...
  36. G

    To find direction and magnitude of forces acting in a system

    Please could I ask for help with the following: Here is my diagram, I show the rod displaced from the sphere so as to label the internal forces acting on each of the rod and the sphere: In the diagram below I have added the line through DE at angle ꞷ the the horizontal, and a few other...
  37. B

    MHB Number of solutions for system of equations

    Hello! I have a simple question about solutions, better said number of solutions for this system of equations. \[ \begin{cases} x_{1 } − x_{2 } + 3x_{3 } − 2x_{4 } = 1\\ −2x_{1 } + 2cx_{2 } − 4x_{3 } + 2x_{4 } = −7\\ − 2x_{3 } + (−c + 6)x_{4 } = 2c + 15\\ − 2x_{3 } + c^{2 }x_{4 } = c^{2...
  38. R

    Finding ##x_c(t=0)## for a system of coupled Masses & Springs

    Hi, First of all, I'm not sure at all how to start this question. I found the eigenvectors in a previous question, but I'm not sure if I need it to solve this one. I think I need to use the expression for the position and velocity. ##a_n = C_n cos (\omega_n t + \alpha_n)## ##v_n = -\omega_n...
  39. D

    Diagonalizing of Hamiltonian of electron and positron system

    What I did was first noting that ##\hat{\vec{S}}_1\cdot\hat{\vec{S}}_2=\frac{1}{2}(\hat{\vec{S}}^2-\hat{\vec{S}}_1^2-\hat{\vec{S}}_2^2)##, but these operators don't commute with ##\hat{S}_{1_z}## and ##\hat{S}_{2_z}##, this non the decoupled basis ##\ket{s_1,s_2;m_1,m_2}## nor the coupled one...
  40. K

    I Rate of change of ##L## in a rotating coordinate system

    * We've a vector ##\mathbf{A}## lying in space, changing according to some rule. * We introduce an inertial frame and find ##\left(\frac{d}{d t} \mathbf{A} \right)_{i n}## in it. * We also introduce a co located frame rotating with ##\mathbf{\omega}##. In this rotating frame I find...
  41. L

    Calculate the net energy of this system (mass and Slinky in an elevator)

    The slinky is designed to fully contract in 1 second. During this one second, the mass is weightless and move up at constant speed of 1m/s. After 1 second the mass gain 1m height in potential energy. Am I missing something?
  42. B

    B Conservation of momentum in a closed system

    In a closed system consisting of a set of particles not at rest relative to each other and acting on each other only by classical mechanical collision (i.e. billiard balls model, not including gravity or other long-range interactions), does conservation of momentum imply that the system will...
  43. D

    StarShip's RCS Thruster system

    Can everyone help me solve this mystery? Starship has 8 sets of RCS thrusters, 4 at the top and 4 at the bottom near the base. The 4 at the top some youtube videos show them above the top fins: Nitrogen RCS test: But some other videos show them below the fins: Are they...
  44. hquang001

    Engineering Signal & System CTFT: Find x(t) from X(ω)

    Given the CTFT X(ω): and here are my solution to find CT signal x(t) associated with the given CTFT , but i got stuck at the limit part
  45. A

    Moment of Inertia of a 4 rod system

    This was the question (The line below is probably some translation of upper line in different language) For disc it was ma^2/2 For ring it was ma^2 For square lamina it was 2ma^2/3 For rods It was different Please explain Thank You🙏
  46. greg_rack

    Solving a Rod-Particle System: Troubles with Forces

    Hello guys, here's another problem I'm having troubles with(I have attached my working out not for laziness, but clarity since steps are many). I started by defining a polar coordinate system, and then drawing the FBD and KD to get to the equations of motion for particle P. I identified 3...
  47. K

    A Change of a vector in a rotating coordinate system

    Goldstein 3 ed, pg 171, under" rate of change of a vector " : The author derives the relationship between the change of a vector in a stationary and rotating coordinate system. In the process he uses this assumption :>It is no loss of generality to take the space and body axes as...
  48. N

    I Find the center manifold of a 2D system with double zero eigenvalues

    I have to find the center manifold of the following system \begin{align} \dot{x}_1&=x_2 \\ \dot{x}_2&=-\frac{1}{2}x_1^2 \end{align} which has a critical point at ##x_0=\begin{bmatrix}0 & 0\end{bmatrix}##. Its linearization at that point is \begin{align} D\mathbf {f}(\mathbf {x_0}) =...
  49. ergospherical

    I System, potential energy, and nonconservative forces: The whole story

    [Mentors' note: This thread was split off from https://www.physicsforums.com/threads/system-potential-energy-and-nonconservative-forces.1009237/] This is not a particularly helpful way to think about things; For a general mechanical system, you usually split the specified forces into external...
  50. F

    I System, potential energy, and nonconservative forces

    Hello, I am trying to get my head around the idea of nonconservative forces doing work and changing the potential energy of a system. First of all, forces acting on a system can be: a) internal and conservative b) internal and nonconservative (friction, pushes, pulls, thrust, etc.) c) external...
Back
Top