What is Newton: Definition and 524 Discussions

The Newton is a series of personal digital assistants (PDAs) developed and marketed by Apple Computer, Inc. An early device in the PDA category (the Newton originated the term), it was the first to feature handwriting recognition. Apple started developing the platform in 1987 and shipped the first devices in August 1993. Production officially ended on February 27, 1998. Newton devices ran on a proprietary operating system, Newton OS; examples include Apple's MessagePad series and the eMate 300, and other companies also released devices running on Newton OS. Most Newton devices were based on the ARM 610 RISC processor and all featured handwriting-based input.
The Newton was considered technologically innovative at its debut, but a combination of factors, some of which included its high price and early problems with its handwriting recognition feature, limited its sales. This led to Apple ultimately discontinuing the platform at the direction of Steve Jobs in 1998, a year after his return to the company.

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  1. A

    Newton 2nd law of a fish in an elevator

    Homework Statement A person weighs a fish of mass m on a spring scale atached to the ceiling of an elevator. (a) Show that if the elevator accelerates either up or down, the spring scale gives a reading different from the weight of the fish. Homework Equations \SigmaFy=T-Fg=may...
  2. E

    Newton colobars (or colorbars)

    Homework Statement Well it's problem to translate it but I will try... We measured Newtons colobars, the radius of third dark colobar in reflective light is r3 (without any data). When we filled the space between lens and board, that radius (r3) had 4th dark colobar... determine the...
  3. B

    Deriving Thrust from Newton II for Rocket Motors

    Homework Statement Derive from Newton II the thrust (the force produced by the rocket exhaust) achieved by a rocket motor which ejects material with constant velocity u and mass ejection rate a. Homework Equations The Attempt at a Solution Not sure...I know how to derive vf =...
  4. X

    Newton's Laws: Force, Time, Acceleration, & Distance

    A 4kg block rests on a table. 5N is applied to it, pulling it the right, giving it an acceleration of 1ms^-2. ( a)If the applied force acts on the block for 5s, what will be the speed of the block at the end of this 5s be? (b)After 5s, the applied force is removed. What will be the new...
  5. B

    Understanding Newton's Rings and Coherence in Interference Patterns

    I'm trying to understand Newton's rings. So we have a plano-convex lens supported in a plane (please, see image here http://scienceworld.wolfram.com/physics/NewtonsRings.html). The incident light is divided into the light that is reflected at the convex surface and the light that is reflected at...
  6. R

    Newton Raphson Method for Finding Roots: Bessel's Function J0(x) near x=5

    Homework Statement Bessel's funtion J0(x) is assumed to have a root near x=5. Use the Newton raphson method to find this root to 3 decimal places by taking the first 4 terms of the series. I have found this link which helps me solve the question: http://www.vibrationdata.com/Newrap.pdf...
  7. T

    Newton binomial problem

    Homework Statement Find the minor value of the natural number n such that \left (\frac{\sqrt{3}}{2} + \frac{1}{2}i \right )^{n} be a real positive number. EDIT: n must not be 0. Homework Equations Considering the binomial theorem as: {\left(x+y\right)}^n=\sum_{k=0}^n{n \choose...
  8. B

    Newton Laws - Finding a constant

    Homework Statement To find the stiffness of a material, a block of that material is placed 30 cm under a metallic cone with 0.3 kg; the cone is free falling from rest, penetrating a distance x in the block until it stops. It is known that when the cone penetrates in the block the force of the...
  9. F

    Why do Newton Rings Form in Circular Patterns?

    why are Newton rings observed in a circuler pattern?
  10. F

    Newton 2nd law + frame of reference

    hello forum, i am struggling with the conceptual understanding of this problem: Given two blocks, one on top of the other. There is friction between the two blocks. The upper block is pulled with a force F. Thanks to friction, as long as F is smaller or equal to the static friction...
  11. M

    Newton, Einstein, multiply connected spacetime, Energy and so forth

    So, multiply connected spacetime may exist or even does already according to current knowledge, right? And in which of the thousand of millions of books about GR, which every physicist seems to have to have written about at least once, ever you read about it, authors claim that, although it's in...
  12. M

    The 3rd law of Newton with electrostatic fields

    Well, say there is an positive particle, and a negative particle. Newton said one is pulling the other, and thus it is pulling back. But we now know both particle actually creating fields, and the fields actually exerting the force on the other particle. so basically, this is not action...
  13. L

    Newton gravitational potential theory

    Homework Statement we all know to measure g.p,e(gravitational potential enery) we would likely to use g.p.e = mgh, however from the theory of Newton gravitational potential energy theory, g.p.e = G\frac{m1m2}{r}, my lecturer told me that mgh is not equal to G\frac{m1m2}{r} Homework...
  14. H

    Proof of F=ma from second law of Newton

    from the second law of Newton we know... applied force is proportional to the change of momentum...that means F= k( mv-mu) where k is constant ...from here now proof F=ma
  15. D

    How Does Newton's Law of Cooling Predict Time for Temperature Changes?

    Homework Statement A container of hot water at 80°C cools to 79°C in 15 seconds when it is placed in a room that is at 20°C. Use Newton's law of cooling to estimate the time it will take for the container to cool from 70°C to 69°C. And still later, from 30°C to 29°C. Homework Equations...
  16. DocZaius

    Uncovering Newton's Thoughts on Friction and Momentum: Couple Questions Answered

    Couple questions regarding Newton: 1) Sort of a historical question...In Newton's time, how did Newton explain the stopping of an object due to friction? I imagine that would have been the first objection to his first law. Could he have said that the Earth's momentum had changed due to the...
  17. Z

    What if Newton had thought differently?

    I am a very mathematical person. I excel in my mathematics courses. In physics, on the other hand, I have always felt less than an expert. I am by no definition a bad physics student. Being mathematically minded I see relationships easily. So physics is not difficult for me to do. What has...
  18. S

    Understanding Newton Method for Solving Equations

    Homework Statement I read that the Newton method for finding roots of an equation doesn't always work. How do I know whether it works or not for a given equation? Homework Equations The Attempt at a Solution For an example, consider: f(x) = 1/(x2-1)+1/(x2-4) - x-1 When I...
  19. N

    Why did Newton believe light was a particle?

    Well?
  20. T

    Newton and approach to second law

    I am curious about the how Newton discovered his laws of motion and his law of universal gravitation. It seems in modern education, the laws are introduced to students somewhat 'magically', and then the students then do various practical experiments and calculations to verify them. If we step...
  21. A

    Solving Newton's Laws Problem: Baseball Player & Runner

    Homework Statement A baseball player hits the ball straight up in the air with a velocity of 18.0m/s. As soon as the ball is hit, the runner on third base dashes toward the home plate. The distance between third base and home plate is 27.4m. Where will the runner be with reference to home...
  22. M

    Weird second law of Newton for rotation

    the proof of second law of Newton for rotation goes like this: take a sphere rotating around some far axis FT=maT FT=m * ALPHA * R multiple by R tau = mR2 * ALPHA and we can say it true for every limit mass in a body. so sigma tau = sigma (mR2) * ALPHA sigma tau = I * ALPHA...
  23. edpell

    Voyager & Newton: Orbits and Mechanics Questions

    I seem to remember hearing that there is some question about the orbits of the voyager spacecraft and weather they obey Newtonian mechanics exactly. Can someone please fill me in on the details? Thanks.
  24. R

    Solve Newton Applications: Find Acceleration of 1, 2, 3kg Masses

    Homework Statement Find the acceleration of the masses based on the figure below. m1 = 1kg m2 = 2kg m3 = 3kg Homework Equations - The Attempt at a Solution I am completely lost, I've tried thinking and thinking over and over again about this problem, wouldn't the...
  25. R

    Newton Applications. Help solving equation with sin and cos.

    Homework Statement At an airport, you pull a 18-kg suitcase across the floor with a strap that is at 45 degrees above the horizontal. Find the normal force and the tension on the strap, given that the suitcase moves with a constant speed and the coefficient of kinetic friction is 0.38...
  26. O

    Why is force measured in pounds instead of Newton?

    unit of force is Newton but... For is measured in Newton but in National Geographic Special documentaries, we have usually heard them using unit "pound" like to determine force like 1) 500 pound bite force of dog 2) 1800 pounds bite force of hippo Why they measure force in pounds not in...
  27. L

    Newton Question #2 (centripetal motion)

    Question reads: Snoopy is flying his vintage war plane in a "loop the loop" patch chasing the red baron. his instrumenets tell him the plane is level ( at the bottom of the loop) and traveling with a speed of 180km/h. he is sitting on a set of bathroom scales. and notes that they read four times...
  28. N

    Kepler, Newton, Gravity, error

    Looking at the gravitational equation F=G*(M*m)/r^2 and centripetal force F = ((V^2)/r)*m If you set the two equal and solve for G you get: G = ((V^2)*r)/M Substituting (4*pi^2*r^2)/T^2 for V^2 you now have G = (4*pi^2*r^3)/(M*T^2) With solution for G, look at Kepler's...
  29. G

    How Do You Solve for Acceleration and Tension in a Pulley System?

    Homework Statement http://img69.imageshack.us/img69/2429/phyq1.jpg Homework Equations to find the acceleration of the 2 objects and the Tension Force. The Attempt at a Solution since only 1 pulley used, a=a1=a2, then m1a=T (1) m2a=-T+m2gsin45 (2) i...
  30. J

    What is the domain of validity of inverse square laws of Newton and coulomb?

    ¿what is the domain of validity of inverse square laws of Newton and coulomb? I think (correct me if this is false) that at the small scale these laws have been verified accurately , but ¿what happens with large distances? :rolleyes: . ¿Have been done an experiment which measured the...
  31. S

    Solving Nonlinear Integral Equation with Newton Method

    Homework Statement If I have a non linear integral equation of the form: y(s)+\int^x_0{K(x,s,y(s)}ds=f(x) and i want to find a way to solve this numerically using the Newton method Homework Equations The Attempt at a Solution after discretizing, and using the quadrature...
  32. J

    Sir Isaac Newton Contest Question (Energy)

    Hey This problem has been stumping me for awhile and I just don't seem able to get it Homework Statement A space shuttle lands ona distant planet where the gravitiational acceleration is 2.0 (We don't know the local units of length and timem but they are consistent throughout this...
  33. I

    How Do You Solve This Newton's Third Law Problem Involving Friction and Tension?

    Newton Third Law problem. Help pleaseee! Homework Statement The 1.0 kg block is tied to the wall with a rope. It sits on top of the 2.0 kg block. The lower block is pulled to the right with a tension force of 20 N. The coefficient of kinetic friction at both the lower and upper surfaces of...
  34. E

    Calculating Arrow Speed with Doubled Force | Newton's Law Problem

    Homework Statement An arrow, starting from rest, leaves the bow with a speed of 29.5 m/s. If the average force exerted on the arrow by the bow were doubled, all else remaining the same, with what speed would the arrow leave the bow? Homework Equations use a= v-vo/t and f=ma The...
  35. M

    How Do You Convert Newtons Per Square Meter to Kilograms Per Square Millimeter?

    G = 0,0135*10ˇ10 kg/mm*sˇ2 G = 8,0*Newton*mˇ-2 <- How to transduct this to the one above? (to kg/mm*sˇ2)
  36. H

    How did Newton derive his law of gravity?

    For some reason I have been extremely curious of how Newton derived his mathematical law for gravitation. You know F= \frac{GMm}{r^2} So the first thing I did before i posted this was search Google and I foundhttp://www.relativitycalculator.com/Newton_Universal_Gravity_Law.shtml" . It...
  37. S

    Is the moon closer or further away to us than predicted by Newton

    I saw on t.v. that the moon's distance to Earth as measured by lasers reflecting off of the mirrors left on the moon by Apollo 13 was a bit off from Newton's Fg = Gm1m2 / r^2 formula. I don't recall if the moon was closer or further away from Earth than what was predicted by Newton's formula.
  38. T

    Are Plumber Blocks Strong Enough for 880 Nm of Torque?

    hello forum members, I,m new to this forum and was hoping some one can help me? I work with industrial fans, we use a steel built frame with the shaft & bearings located in an housing called "plumber blocks" that are on top of the steel frame. The blocks are bolted down using 16mm bolts that...
  39. A

    I can not calculate these Newton equations

    A block B of 20 kg is trapped by a wire of 2 m a car A of 30 kg. Determine (a) the acceleration of the car (b) the tension of the wire, immediately after the system was abandoned the rest, in the position shown in the figure. Despise is the friction. Answer: (a) 6,17 m/s^2 (b) 144 N My...
  40. E

    Basic question on the Newton and acceleration

    I am a chemistry student and don't know much about physics. I am trying to understand the definition of the coulomb. Correct me if I am wrong please... A Newton is the amount of work it takes to push one kilogram 1 meter per second... Two Newtons would accelerate the object from 0 m/s to 2...
  41. Z

    Isaac Newton and Albert Einstein

    If both Isaac Newton and Albert Einstein are still alive today, imagine the world we will be living in and the impact on all theories of physics! Can you imagine what the world will be like with them still around?
  42. D

    Connecting Newton and Coulomb: Is There a Link Between Their Laws?

    Do you know if someone already found a link between Newton : F = G mm'/r^2 and Coulomb : F = K qq'/r^2 laws ?
  43. A

    Newton III problem involving two objects in space

    Homework Statement An 93.0 spacewalking astronaut pushes off a 620 satellite, exerting a 120 force for the 0.470 it takes him to straighten his arms Homework Equations FA on S=FS on A Xf=Xi+Vi\Deltat+1/2a(\Deltat)2 Those are the equations I think I use. And initial velocity...
  44. C

    What does the European standard for cookware say about lid design and force?

    Hi all, I'm new to this forum. I just joined the forum and I hope that you guys could help me out. I'm in the trading business of cookware. I'm currently studying the European standards for these items and there's a point in the standard that I don't understand at all. It says: The...
  45. I

    Can a stiffer spring help my Newton Scooter travel 1.5 meters?

    I am trying to construct a Newton Scooter (one powered by Newton's Third Law) using a spring. Basically, I am supposed to make the scooter travel 1.5 meters. I've tried using a spring from a retractable pen, but the vehicle I constructed seems to be going nowhere. It seems as though too much...
  46. M

    Newton for a 4x4 system of nonlinear eqns

    Hi All. Can somebody give me a sample MATLAB code for Newton-Raphson Method for Nonlinear 4x4 System of Equations. I'm trying to set a very ugly one up and haven't seen NR before the beginning of this week. I've figured the NR for a single eqn but this is driving me nuts.
  47. M

    MATLAB Setting up Newton Raphson integral with matlab

    Hi All. I have an equation that i want to numerically find the root of by using Newton Raphson. However the equation involves an integral which i am using the trapazoidal rule to evaluate. And here is the simplified version of it: 1 = e^{-cy} \int_0^1 e^{-y(1-x)} dx So i am supposed...
  48. A

    Einstein vs Newton: Exploring Gravity & Spacetime

    If gravity is a force, then the moment the object producing gravity is taken away, it should result in gravity taken away instantaneously. However, why does Einstein say that Newton's classical mechanics are incorrect and that in fact he decided to propose spacetime and not follow what Newton...
  49. U

    Sir Isaac Newton contest solutions 2007

    Sorry if I posted in the wrong place. Does anyone know where to get the Sir Isaac Newton contest solutions 2007? The site has solutions for 2008, but not of previous years. Thanks.
  50. P

    At what age did Newton encounter mathematics

    At what age did Newton encounter and fell in loved with mathematics? I was really surprised when some sources said that he learned trigonometry during his college years and that he didn't really read Euclid's elements until after...
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