What is Push: Definition and 204 Discussions

Push technology, or server push, is a style of Internet-based communication where the request for a given transaction is initiated by the publisher or central server. It is contrasted with pull/get, where the request for the transmission of information is initiated by the receiver or client.
Push services are often based on information preferences expressed in advance. This is called a publish/subscribe model. A client "subscribes" to various information "channels" provided by a server; whenever new content is available on one of those channels, the server pushes that information out to the client.
Push is sometimes emulated with a polling technique, particularly under circumstances where a real push is not possible, such as sites with security policies that require rejection of incoming HTTP/S requests.

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  1. E

    MATLAB Working with push buttons in Matlab GUIs

    I am trying to create a simple GUI in Matlab with two push buttons and two static text boxes. The basic premise is that a question will pop up and the user can press either the "yes" or "no" push button, resulting in either another question or an answer (in the second text box). My current...
  2. V

    Why is is easier to push a heavy load on wheels with a short lever

    Why is it easier to push a load on a wooden crate on wheels when you are nearer the load and the lever is shorter and at a sharp angle compared to pushing a load with the lever lengthened and at a more relaxed angle with your body further away?
  3. D

    HELP determine work needed to push a crate up a ramp at constant speed

    Homework Statement A ramp leading up to a loading platform is 3 m long and 1 m high at its highest point. If the friction is ignored, what work is needed to slide a 600-kg crate up the ramp at a constant speed? a) 2.00 *10^2 J b) 5.89 *10^2 J c) 1.80 *10^3 J d) 5.88 *10^3 J I...
  4. M

    Solenoid; high-speed push and pull

    Hi all. I am going to build an industrial quality knife-tool to cut cardboard, and I would like to ask you all for any advice, experience and warnings you might have. I'm in the need of a motor to oscillate a knife at a frequency of 200-300 Hz, with a stroke of 1.2mm +/- 0.6mm. The knife it...
  5. P

    Push Mass Up Ramp: What Makes Vertical Displacement?

    if i were to push a mass up a ramp by giving a horizontal force, the normal force do no work since it is perpendicular to the displacement. But then, what makes the mass have an upward and vertical component in its displacement?
  6. C

    Trying to figure out the forces needed to push a heavy sliding door.

    I have been working with Physics for a while. I have recently come across a problem I could not solve efficiently. I have been designing a sliding door with 4 wheels with a rolling co efficient of 0.03. I thought that if I simply be using Force applied by door on all 4 wheels multiplied by...
  7. S

    MOSFET Push Pull Common Drain

    Hi everyone, I have this following problem (uploaded it in the pdf). I have made an attempt at solving it, but now i am just stuck. I have done question one, and have confirmed my answers in PSpice. my Id = 16uA, Vgs = 1.4V and Vds = 4.6V ( 3 + 8/5) and for p-channel the values are...
  8. H

    Courses What courses is Discrete Mathematics necessary for? I may need to push it back.

    None of my advanced courses require discrete math as a requisite. In fact, the only course that does explicitly require it is not on my degree plan of operations research. However, is this going to bother me when it comes time for say Real Analysis, Advanced Calc, or Abstract Algebra? I think...
  9. AJKing

    What kind of force would be needed to push the Moon into the Earth?

    I'm not very fluent in how astral bodies are affected be gravity yet, or else I'd punch some numbers myself. But, what would be needed to knock the moon out of its current orbit and start it on an eventual collision course with the Earth? And what could (theoretically) cause this force?
  10. M

    Newton's third law and a box push

    Homework Statement I just don't understand how to describe how, if a person pushes on a box and the box exerts an exactly equal but opposite force on the person that the person is still able to move the box... Homework Equations n/a The Attempt at a Solution n/a
  11. N

    Motion/Acceleration: free-fall gravity vs. ball being push downward

    Motion/Acceleration: free-fall gravity vs. ball being "push" downward Homework Statement If by accident a ball were given an initial downward push instead of being freely released, would the resulting g be different? Explain. (this is ignoring any air resistance) Homework Equations N/A...
  12. J

    If light has no weight, how can it push objects?

    Your probably familiar with the solarsail tech when people use light to push space ships with sails. This is light that is pushing matter with mass, I learned in school that in order to have momentum you have to have mass and light has no mass and therefor no momentum. And if you get hit...
  13. I

    Power needed to push an object vertical at constant velocity

    Homework Statement Stuntman's Freefall, a ride at Six Flags Great Adventure in NewJersey, stands 39.6 meters high. Ignoring the force of friction, what is the minimum power rating of the motor that raises the 1.20×105kg ride from the ground to the top in 10.0 seconds at a constant velocity...
  14. T

    Force Needed to Push a Box on an Inclined Plane

    Homework Statement A man is pushing a box on top of a plane that is inclined 20 degrees above the horizontal, with a distance of 10 m. The weight of the box is 20 kg and the coefficient of kinetic friction is 0.30. The velocity is constant. How much force is exerted by the man? Find the work...
  15. D

    Minimum force necessary to push out a cork

    Homework Statement 2 arms of a u-tube are not identical, one having twice the diameter of the other. a cork in the narrow arm requires a force of 16n to remove it. the tube is filled with water and the wide arm is fitted with a piston. the min force that must be applied to the piston to push...
  16. F

    Discussing Push vs Pull with My Boss

    Hello, I am new to the forums and having a discussion with my boss at work regarding when you are pushing something and when you are pulling something. We are writing curriculum for training and aren't completely sure when to say push and when to say pull. It isn't that difficult, I know, but...
  17. N

    Force needed to push an incline with a mass on it

    Homework Statement Incline with the mass of M and angle of theta. mass on the incline with the mass of m. Find the force needed to push the entire system such that the mass remains at rest relative to the incline. Everything is frictionlessHomework Equations F=maThe Attempt at a Solution well...
  18. A

    Momentum conservation? stranded in space push on something to get to ship

    Homework Statement You have a 99 kg mass and are stranded away from your ship, at rest, next to a giant 1800 kg ball of space doody. You push on the doody giving it a speed of 0.11 m/s directly away from the ship. Seven-and-a-half seconds later you come into contact with your ship. What was...
  19. M

    Push Me Pull You centre of mass motion

    Homework Statement Two identical blocks of mass m are attached via a massless spring of spring constant k. The length of the spring in equilibrium is l. The system moves on a frictionless horizontal plane. With one block resting against a wall, the two blocks are pushed to- gether, so...
  20. J

    Looking for a push button breadboard switch

    Can anyone recommend a push button switch that fits into a breadboard from mouser.com? I just want a push button switch that I can use to switch between Vcc and ground to use as the clock for a counter, but there are so many switches on mouser and I'm not sure which one to get. Can anyone help?
  21. H

    Sliding Object After a Push

    A 220-kg crate rests on a surface that is inclined above the horizontal at an angle of 18.3°. A horizontal force (magnitude = 501 N and parallel to the ground, not the incline) is required to start the crate moving down the incline. What is the coefficient of static friction between the crate...
  22. G

    Permutations With No Consecutive Numbers - Need Push In The Right Direction

    First I'd like to mention I don't want the answer, I'd just like a hint in the direction which I should start working in. I just don't know how to begin the problem. Homework Statement How many permutations of 1, 2, . . . , n are there in which i is never immediately followed by i + 1, i = 1...
  23. J

    Help with a Friction Question: Maximum mass a Man can Push

    Homework Statement A man of 72.0kg is pushing a heavy box along a flat floor. The coefficient of sliding friction between the floor and the box is 0.20, and the coefficient of static friction between the man's shoes and the floor is 0.65N. a) If the man pushes downward on the box at an...
  24. S

    Push down on book, frictional force

    Homework Statement Place a book flat on a table and press down on it with your hand. Now suppose the hand-to-book and table-to-book coefficients of kinetic friction are 0.48 and 0.40 respectively. The book's mass is 0.80 kg and your downward push on it is 10.90 N. How much horizontal force is...
  25. G

    How to make a air cylinder push up a gate

    Hello All, I am building a project where I am looking to have a pnuematic cylinder mounted underneath a ramp and push up a gate that is hinged, to 90 degrees, however I am struggling on how to get this to properly function. From center to center of the 2 clevis mounting holes, on the...
  26. F

    Are we push or attracted to a planet?

    Last year while thinking about it, I thought it will make more sense if we were pushed on our planet rather than being attracted to it. Mathematically, there is no change made to the current equation by reversing the force vector's direction! While I am read "Reinventing Gravity" from John W...
  27. A

    Solving for applied force to push an object up a ramp.

    A box, mass 100kg, must be pushed onto a table using an inclined plane 1.5 m high. The plane is 4 m long. If the pleane offers a frictional force equivalent to 10% the weight of the box, what force must be applied to move the box? What I tried: sin^-1(4/1.5) = 22.6 100 * 9.8 = 980 N...
  28. L

    What is the required force to push a box up a slippery ramp?

    Homework Statement A 10 kg box is being pushed up a slippery ramp as shown in Figure 2.1. The coefficient of friction between the box and the ramp is just μ = 0.1. (a) What force does the man need to apply to the box to keep it traveling up the ramp at a steady speed?Homework Equations I have...
  29. K

    What is the applied force required to push an object up a ramp?

    Homework Statement A cabinet is pushed up a ramp at angle of 10 degrees. The cabinet weighs 100 kg. The friction coefficient is 0.30. What is the minimum applied force required to push the cabinet up the ramp? Calculate the time it takes to push the object up the ramp. The ramp is 15...
  30. S

    Understanding Current Gain in Push-Pull Amplifiers

    I'm trying to figure out the currubt gain for a class ab push pull amp. I know that it's basically two emitter followers, so am I correct in assuming that the current gain is just Beta?
  31. E

    Calculating the push force on a vehicle

    Hi, I am trying to work out what force you would need to push a four wheel vehicle of mass 200kg from rest to a top speed of 2m/s (acceleration 1m/s2) and the force needed to maintain that top speed . I am not sure how to go about this, do i just consider rolling resistance and take that as...
  32. M

    Plane falling from air, mechanical physics, need push in right direction

    http://i39.tinypic.com/2qvfrya.jpg That is the problem that I am trying to solve. It is simply a practice question but I want to make sure that I am doing things right and that I am prepared. I understand the concept of this problem and have modeled the problem on paper with triangles. I just...
  33. FeDeX_LaTeX

    Voltage is the Push on Electrons ?

    Voltage is the "Push on Electrons"? Hello; This is the definition that I have always been given. However, what exactly pushes these electrons? What is the force that is causing this? Thanks.
  34. J

    How much work to push a spring up/down a distance of y?

    Homework Statement The ends of a relaxed spring of length L and force constant k are attached to two points on two walls separated by a distance L. How much work must you do to push the midpoint of the spring up or down a distance of y? Homework Equations W = -1/2k(b2-a2) (after...
  35. M

    Why is it tiring to push hard against a solid wall even though no work is done?

    I've seen this exact question in a book. (This is not homework) I've always thought this is because work has nothing to do with effort, but seeing this question on a book quite shocked me actually, is there any deeper explanation?
  36. M

    What speed should you push the box

    Homework Statement You and your friend Peter are putting new shingles on a roof pitched at 23degree . You're sitting on the very top of the roof when Peter, who is at the edge of the roof directly below you, 5.4 m away, asks you for the box of nails. Rather than carry the 2.3 kg box of nails...
  37. Andre

    Charismatic push through mastodon

    Currently I'm working hard translating a manuscript about trunk animals. There is a thread about this in the Earth forum. I just did this part: My question, google does not tell a lot about this, but is this common in other countries as well, to use 'mastodon' like that?
  38. D

    Calculate the Force of a Certain Push

    Homework Statement A person exerts a force 25 degrees to the horizontal on a 5kg book resting against a vertical wall. If the coefficient of static friction is .76, what is the minimum force that the person must exert to keep the book from sliding down the wall. Homework Equations force...
  39. lexo

    Should I Participate in Every Competition to Impress Universities?

    I'm new here and this is my first post, so I'ld like to give you all a hearty hello right at the beginning! Long story short, I'm in high-school and I'm wondering whether I should go nuts and take part of every single competition and olympiade etc to impress the universities I wish to apply for...
  40. R

    A push to an object in complete vaccum.

    Hi guys When we push an object i.e apply some force on it in complete vaccum, then due to absence of any friction; and inertia, what will happen, will the object accelerate forever because it has no reason to decelerate? Or will it move with constant speed?Why? If the object will move forever...
  41. Greg Bernhardt

    ESPN's Push to 3D Programming: Pros & Cons

    I was reading this story on CNN about how ESPN is starting to develop and implement 3D programming. http://www.cnn.com/2010/TECH/01/05/espn.3d/index.html It seems like an obvious step with the 3D movies out. However, besides the fact you'll need to buy a new TV, you will also need those 3D...
  42. O

    Motor to Push Air into a Piston

    Alright. I need a motor that is capable of pumping air into a piston filled with compressed air. The motor needs to pump the air into the piston at a constant speed, as the piston is being used to raise up a load. The problem is that the weight of the load on the piston will be between 10-200...
  43. B

    Calc Push Force Req'd to Move 13g Steel Block on Steel Table

    How much work must you do to push a 13g block of steel across a steel table(coefficent of friction=.6) at a steady speed of 1.2 for 8.8 ? I know that Work=Force*Distance i know what the D is but i don't know how to calculate the force. i tried F=MA and got Fnet= Force pushed...
  44. G

    Two different people push a fridge at two different times. Find Ffric and mass.

    I honestly can't figure out what to do. 3. Paul and Mintu are attempting to push a heavy fridge across the kitchen floor. When Paul pushes it with a muscular force of 550N, the fridge accelerates from rest to 28.0 cm/s in 3.5 s. When Mintu pushes it with a muscular force of 560N, the fridge...
  45. C

    Force of Ladies Push: Calculating Fpush & Normal Force on a Box

    Homework Statement A woman pushes horizontally on a wooden box of mass 52.0 kg sitting on a frictionless ramp inclined at an angle of 30.0 degrees. Calculate the magnitude of all forces acting on the box under the assumption that the box is at rest. Homework Equations The Attempt...
  46. L

    What are the biggest problems of push / kinetic gravity theory?

    What are the biggest problems of "push" / kinetic gravity theory? Please, don't crucify me! I saw a couple of threads here closed for bringing this up, which I don't really understand why. Shouldn't we always doubt? I understand that it is old and common and amateurish idea in physics, but that...
  47. S

    Determining the Minimum Force to Push a Crate

    You try to push a crate of weight M with a force F on a horizontal floor. The coefficient of static friction is μs, and you exert the force F under an angle φ below the horizontal. Determine the minimum value of F that will move the crate. Okay so basically what i did was equate Mμs=Fcos φ and...
  48. P

    What Is Causing the Exception in My Push() Function Code?

    What's wrong with this piece of code: for (i=0; i!='\n'; i++) { if (isdigit(elements[i])) { array[i] = elements[i] - '0'; push(mystack, array); } } Whever I run it, it gives exception. There's some problem in this line but I can't...
  49. R

    Are the magnetic forces of 'push' and 'pull' equal?

    Magnetic "Push" and "Pull" To make the question simple to understand, if I took two standard bar magnets, and placed them approx. 4 cm from each other with a north pole facing south, and then placed them the same distance from each other but with a south pole facing south, would the attractive...
  50. K

    Using Titanium for Push Button Switches

    Can titanium made thin enough or designed a certain way to be used as a cover for a push botton switch? Such as the one made from plastic in the flashlight below. http://www.photonlight.com/PhotoDetails.asp?ShowDESC=N&ProductCode=P1-keychain-LED-flashlight The titanium would cover the...
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