What is Machine: Definition and 968 Discussions

A machine is a human-made device that uses power to apply forces and control movement to perform an action. Machines can be driven by animals and people, by natural forces such as wind and water, and by chemical, thermal, or electrical power, and include a system of mechanisms that shape the actuator input to achieve a specific application of output forces and movement. They can also include computers and sensors that monitor performance and plan movement, often called mechanical systems.
Renaissance natural philosophers identified six simple machines which were the elementary devices that put a load into motion, and calculated the ratio of output force to input force, known today as mechanical advantage.Modern machines are complex systems that consist of structural elements, mechanisms and control components and include interfaces for convenient use. Examples include: a wide range of vehicles, such as automobiles, boats and airplanes; appliances in the home and office, including computers, building air handling and water handling systems; as well as farm machinery, machine tools and factory automation systems and robots.

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  1. A

    Inductance of a Rotating Machine

    Homework Statement The stator of the magnetic circuit of the above figure has a coil of turns 200, which carries a current of 1A. The rotor has a radius of 30mm, a height of 30mm and an axial depth of 20mm. The material for the stator and rotor has infinite permeability. The air gap...
  2. W

    Atwood Machine: Reduce Exp Errors By Stabilizing Masses

    Homework Statement String that is equal in length to the string connecting the pulley is sometimes tied to the bottoms of the two masses, where it hangs suspended between them. Explain why this would reduce experimental errors. Homework Equations The Attempt at a Solution I'm...
  3. C

    Rotational Inertia of an Atwood Machine

    1. In the figure below, the pulley is a solid disk of mass M and radius R with rotational inertia .5MR. Two blocks, one of mass m1 and one of mass m2 hang from either side of the pulley by a light cord. Initially, the system is at rest with block 1 on the floor and block 2 at height h above...
  4. G

    Why is my Atwood's Machine homework solution incorrect?

    Homework Statement ok here's the problem in a picture h t t p : / / i m g 1 9 2 . i m a g e s h a c k . u s / i m g 1 9 2 / 4 5 0 0 / c a p t u r e x x w . j p g Homework Equations Sigma F = ma Fg = mg The Attempt at a Solution ok I called the 4 kg block m3 and the 2 kg...
  5. M

    How Does an Ultrasound Machine Detect Reflected Waves?

    how does ultrasound machine detects the reflected wave? i have read a bit of information and unfortunately I am still unsure how they detect the wave. "The rapid shape changes, or vibrations, of the crystals produce sound waves that travel outward. Conversely, when sound or pressure waves...
  6. H

    Atwood Machine: Forces & Motion True/False Quiz

    Homework Statement A frictionless, massless pulley is attached to the ceiling, in a gravity field g = 9.81 m/s2. Mass Mb is greater than mass Ma. The tensions Tx,Ty, Tz, and the constant g are magnitudes. (Select a response for each statement.) Please look at this pic...
  7. C

    Atwood Machine Help: Problem 1 Harvard

    Homework Statement http://isites.harvard.edu/fs/docs/icb.topic725237.files/problemset3_2010.pdf (Problem 1) Homework Equations f=ma, string conservation The Attempt at a Solution I'm not really sure how to do this. I know that the t of the string on the left is equal to the two...
  8. I

    Boolean expressions for Turing Machine

    Hello, I want to express Non-Deterministic Turing Machine constraint with boolean expression. The constraint is: "Cells which aren’t being read remain the same at time t+1". lets say H[i,j] means the read/write head at time i at cell j and S[i,j,k] means the symbol k at time i in cell j so the...
  9. D

    Is My Compressor Adequate for My Buttler Press Machine?

    Machine and compressor (how to solve this??) Okay all, my first post I am from Australia so not sure which unit you guys preferred in this forum. :smile: Got this project to swap our plant compressor to smaller unit. My compressor details: pressure: 7.5 Bar / 110 psi power: 30 KW / 40...
  10. S

    Rube Goldberg Machine: Tips and Ideas to Get Started

    Hey everybody. I am starting this seemingly impossible and hard project of making a rube goldberg machine. Can anyone give me helpful tips and ideas on how to start it? and perhaps provide examples?
  11. D

    CNC Turning Process: Learn the Basics & Machine Diagrams

    could anyone help me with cnc turning process, diagram of machine. it be better if you can give me manual book about it. i need to learn about cnc from introduction and part of that machine. I'm new in this course.
  12. R

    Simple Harmonic Motion of a sewing machine

    Homework Statement A sewing machine needle moves up and down in simple harmonic motion with an amplitude of 1.27cm and a frequency of 2.55Hz. How long does it take to travel 11.43cm? Homework Equations x=A*cos(w*t) w=2\pi*f w=2\pi/T T=1/f The Attempt at a Solution I can't...
  13. C

    What mistake did the author make in their Atwood machine problem?

    Homework Statement http://imgur.com/a2fLm Homework Equations F = ma is it The Attempt at a Solution The problem I had is that it's attached to the floor all of a sudden. Never before have we had Atwood problems like this, and I can't find any online... I drew out the free body...
  14. P

    Designing a coconut husk removal machine

    Hi friends, This is my first post here in this forum. hope to hear as well as contribute to this forum in whatever best possible ways I can. Here I am with my problem domain. peeling off the coconut husk from the coconut. especially when the coconut husk is totally dried up. This...
  15. A

    Atwood's Machine with 3 pulleys

    Homework Statement There are three pulleys in this system. The leftmost pulley is attached to ceiling. It has a string running through it with a mass of m attached. The rightmost pulley is also attached to the ceiling. It has the same string running through it with a mass of 3m attached. In...
  16. H

    Forces question, a pedagogical machine

    forces question, a "pedagogical machine" Homework Statement All surfaces are frictionless. How much force must be applied to M1 in order to keep M3 from rising or falling? Picture: http://www.slideshare.net/brigittperalta/sol-maquina-pedagogica-1546585 Homework Equations F...
  17. P

    How does a FTIR machine operate?

    I know the basics about the interferometer and how this causes intereference patterns in a broadband spectrum to occur but I need to clarify a few things and I can't find the answer in any textbook: 1. The detector receives information on the intensity of radiation being received and I have...
  18. P

    Trouble Understanding Fourier Transform IR Machine: Can Anyone Help?

    Homework Statement Im having a real problem trying to imagine what happens inside the machine can anyone help? I thought that at the interferometer a beam is split into two and then recombined with a path difference to introduce interference. Because the IR source is broadband would all of the...
  19. P

    FTIR Machine: Interference of Blackbody Radiation Source

    Homework Statement Hi there sorry to keep bombarding you all with these stupid questions but I just can't picture it in my head. In a FTIR machine when the blackbody radiation source is split at the beam splitter and half the frequencies are retarded before making a resultant wave and passing...
  20. T

    Atwood machine problem - symbolically solving for mass?

    atwood machine problem -- symbolically solving for mass? Homework Statement Symbolically solve the equation derived for the acceleration of the Atwood's machine in part 1, A-3 for the mass m in terms of M, g, and the acceleration, a. (No numbers.) This question is part of a lab, so of...
  21. M

    Is a Transformer Considered a Machine?

    why transformer is a machine?
  22. T

    Exploring Time Machines: Investigating the Possibilities

    The time machine idea ! I see lot of discussion going on time machines. there are different theories but none of them seems to be bringing any results. what exactly we are lacking in terms of achieving this. I think we have fairly enough good technology available atleast at atomic level...
  23. O

    Build a machine that could defy gravity

    Hey, first off I want to say that I don't have much background with physics (that's the reason I don't know where to put this thread at, because I have no clue of what kind of physics this contains) even though I would love to. But anyways, I was thinking randomly the other day and I was...
  24. Jonnyb42

    Which Degree for Building a Time Machine?

    I KNOW that this has been asked many times before so I will put it in a way that is not as similar as the rest. My true goal is a bit far fetched so I will just say that I would like to build a time machine. What my question is, which should I study the most, and mainly in college because I am a...
  25. P

    What is the explanation for the 4m mass going down in a double Atwood machine?

    Homework Statement I have a double Atwood machine; on left side there is a heavy thing which weight 4m, on right side there is another circle (this circle which go around in atwood machine) and on left there is heavy thing which weight m, on right - mass which weight 3m. Now the 3m thing starts...
  26. E

    Career Opportunities in Signal Processing and Machine Learning

    Hi all, I'm considering doing a masters in either signal processing or machine learning. I have a bachelor's in electrical and electronic engineering, and have a bit of experience (internships mostly) in both industry and research. I was wondering if there are a lot of career opportunities...
  27. L

    Modified Atwood's Machine on an Inclined Plane

    Homework Statement Block B with a mass of (.75kg) is on an inclined plane attatched by a pulley to Block A which has a mass of (1.5kg). The angle given is 40 degrees. The coefficient of friction of Block B on the ramp is .29. What is the acceleration? Homework Equations Fnet=m*a...
  28. A

    How Does Friction Affect Torque in an Atwood Machine?

    Homework Statement Two masses are suspended from a pulley of mass m supported by an axle (Atwood machine). What is the net torque acting on the pulley wheel in terms of T1 and T2? There is friction between pulley and rope. Ropes are massless and pulley can rotate without friction about its own...
  29. G

    Perpetual motion machine selling site

    Hi, people! I've recently found this site on the web: [link deleted by Ivan] It is a site thet sells plans for various so called "fuelless motor" devices. Take a look, and you'll see that it is basically selling plans of perpetual motion machines (and they aren't even original! The diagram...
  30. 6

    Digital Electronics: State machine

    Homework Statement (a) How many states does this system have? (b) How many rows will there be in a state transition table? (c) Provide the state transition table. (d) Draw a state diagram of the system. (e) Describe what the circuit does in words. Homework Equations The Attempt at a...
  31. E

    How Do You Design a Moore State Machine for Two's Complement Operations?

    Homework Statement Can someone check my work? [...] Receiving DATA in binary. The string length of each word is unknown. You are told that each word, demarcated by SYNC signals, is a two's complement number. Your task is to develop a synchronous sequential machine which examines the...
  32. V

    Angular velocity of a machine problem

    A machine rotates at an angular velocity of 1.6rad/s. Its velocity is then increased to 6.2rad/s at an angular acceleration of 0.7rad/s2. (a) How many revolutions does it make during its acceleration? (b) How long does the acceleration take? Sorry I'm not quite sure as how to approach this...
  33. S

    In need of a modification idea for the design of an ice making machine

    Hi all, My Undergraduate thesis requires me to design an ice making machine by modifying existing machines. I will appreciate your ideas on how I should go about it. Thanks in Advance! :smile:
  34. J

    How to machine a NPT internal thread?

    I want to tap a NPT (NPT-3/4) thread hole on a plate. And I found some related standards, these standards told me the detailed dimensions of the thread. My question is how to machine the NPT thread with a tap? How to control the parameter mentioned in the standards? thanks in advance!
  35. L

    Machine part ABC is supported by a frictionless hinge

    The machine part ABC is supported by a frictionless hinge at B and a 10degree wedge at C. There is also a 120 lb force pushing to the right of point A. Knowing that the coefficient of static friction is 0.20 at both surfaces of the wedge, determine (a) the force P required to move the wedge to...
  36. P

    How Do You Calculate Acceleration in an Atwood Machine?

    Homework Statement ATWOOD MACHINE LAB Draw a free body diagram of m1 and another free body diagram of m2. Using these diagrams, apply Newton’s second law to each mass. Assume that the tension is the same on each mass and that they have the same acceleration. From these two equations, find...
  37. L

    What is a Finite-State Machine for Changing Every Other Bit in an Input String?

    Homework Statement Construct a finite-state machine that changes every other bit, starting with the second bit, of an input string, and leaves the other bits unchanged. Homework Equations - The Attempt at a Solution Say I have the string 1001101, then I am supposed to make a...
  38. K

    Calculating Tension in Atwood Machine

    Homework Statement I'm looking at how to calculate the tension in the ropes in an Atwood machine (two masses hanging on either side of a pulley, with mass 2 on the right side). We were told, for connected objects, that it was easiest to treat the two objects as a system and use a curved...
  39. E

    Wormhole Time Machine: As Time Goes On

    Suppose a wormhole time machine is made by moving one mouth close to speed of light for a suitable time. Further suppose that immediately after the time machine is first completed, we have the following: Time at Mouth 'A' ---> 2010 Time at Mouth 'B' ---> 2000 Now if 20 years go by, would...
  40. W

    Applying force vs applying weight to an atwood machine

    I have two problems which appear equivalent, but apparently they are not. The first one is this: M, a solid cylinder (M=1.75 kg, R=0.131 m) pivots on a thin, fixed, frictionless bearing. A string wrapped around the cylinder pulls downward with a force F which equals the weight of a 0.750 kg...
  41. C

    How Does Total Mass Affect Acceleration in an Atwood's Machine?

    Homework Statement What is the relationship between the total mass and the acceleration of an Atwood’s machine? The Attempt at a Solution I have a graph from the lab, but the regression value for the best fit line is very poor, so it is difficult to tell much from the values. I can see...
  42. S

    Black Hole Time Machine (time dilation)

    All, I am familiar with the concept of orbiting a black hole without entering its event horizon as a means of time travel. Does anyone have any research on this matter, or know of any papers which deal with this concept. I would really like to explain this concept to a colleague and additional...
  43. J

    Calculating Acceleration of Mass in Atwood Machine

    1.In the diagram above, the pulley is frictionless and the ropes are massless. Given that m1 = 14.5 kg and m2 = 23.0 kg, calculate the acceleration of m2 downwards. What is the magnitude of the tension in the string...
  44. A

    Artificial gravity in a washing machine

    Homework Statement If a washing machine's drum has a radius of 26 cm and spins at 4 rev/s, what is the strength of the artificial gravity to which the clothes are subjected? Express your answer as a multiple of g. Homework Equations w = distance/time w= (angular velocity) The...
  45. C

    Solve Semi-Atwood Machine Homework: m1=0.30kg, m2=0.45kg, θ=11°

    Homework Statement Again, I've uploaded a diagram of the problem. In the setup shown, m1 = 0.30kg, m2 = 0.45kg and theta = 11 degrees. Also, between the first block and the incline, coefficient of friction = 0.40. Assume the system moves so that the first block slides up the incline. (a)...
  46. W

    Atwood's Machine with unknown masses

    Homework Statement A simple Atwood's machine uses two masses m1 and m2. Starting from rest, the speed of the two masses is 8.7 m/s at the end of 7.4 s. At that time, the kinetic energy of the system is 61 J and each mass has moved a distance of 32.19 m. Find the value of the heavier mass...
  47. そ

    Does a machine like this violate laws of thermodynamics?

    Assuming a machine such that it produces blocks of negative and positive mass from vacum, and it uses the produced positive mass to power all these procedure such that it forms a perpetrual motion machine. would it be theoredcally posible to do this with the positive mass produced in the...
  48. M

    Double Atwood Machine (With one end of the string connected to the ground)

    [b]1. Homework Statement [/b ]http://teacher.pas.rochester.edu/phy121/PracticeExams/FinalExam/FinalExam_files/image015.jpg This is not the exact picture, instead of having M1 there let end of the string be connected to the ground instead Find the tensions and accelerations Homework...
  49. J

    Atwood Machine Related Question

    Homework Statement A 59-kg window-washer stands on a 17-kg platform. The platform is fixed to a rope that passes over a pulley attached to the ceiling, which allows the window-washer to raise himself and the platform. (a) To accelerate himself and the platform at a rate of 0.84 m/s2, with...
  50. C

    Finding Acceleration in Atwood's Machine

    Edit: Today I was shown how to break this down into multiple free-body diagrams, and introduced to Cramer's Rule. I'm in the process of reattempting this problem. Once I have a solution (and it's verified as correct) I will post it for others having similar trouble. I'm having a terrible time...
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