What is Newtonian: Definition and 336 Discussions

The Newtonian telescope, also called the Newtonian reflector or just the Newtonian, is a type of reflecting telescope invented by the English scientist Sir Isaac Newton (1642–1727), using a concave primary mirror and a flat diagonal secondary mirror. Newton's first reflecting telescope was completed in 1668 and is the earliest known functional reflecting telescope. The Newtonian telescope's simple design has made it very popular with amateur telescope makers.

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  1. K

    Newtonian mechanics and capstan

    Consider a capstan.A circular body around which a strong rope is wound.The free ends of the rope are pulled with tension Ta and Tb. Ta>>Tb.Co--eff. of friction is mu.theta is the total angle subtended by the attached portion of the rope on the centre of the drum.Prove that Ta=Tb[exp(-mu theta)]
  2. K

    Force F for Balanced Masses M2, M3 on Block M1

    A rectangular block of mass M1 rests on the frictionless horizontal plane.On it there is a rectanglar shaped hole, drilled from upper surface.A mass M2 is on the frictionless upper surface of the block being connected through string over a pulley another mass M3 which hangs in the hole.The mass...
  3. Amith2006

    Inertial Frame Characteristics in Newtonian Mechanics

    # In Newtonian mechanics, which of the following characteristics of a particle is the same in all inertial frames? a)Speed b)Velocity c)Momentum d)Impulse Does Newtonian mechanics mean Classical mechanics?
  4. J

    Spacetime in Newtonian kinematics

    I've just had a silly thought. Newtonian spacetime wrt to postion space is basically a vector bundle. If you want to assign each postion vector to a point in on a Riemannian/Pseudo-Riemannian manifold you have to take the following two things into account: a) Each vector in any given vector...
  5. S

    Does Newtonian gravity bend light?

    Looking for help interpreting a proof of G.R. please. . . One of the earliest proofs of G.R. was the deflection of light by a gravitational field, first shown in 1919 during a solar eclipse. I think Einstein predicted approximately 1.7 seconds of arc deflection during that eclipse. But...
  6. Z

    Mirror Equations: Derivation of Newtonian Form

    Hallo, First time I've experienced a real problem rearding equations in physics, so: As conclusions to the lab on focal points and and center of curvatures (which will be explained at a later date), we were given the following relationships: So = Do - f Si = Di - f And, we were...
  7. F

    One more tricky 2nd Newtonian Law with friction problem

    This time I'm uncertain as to how to start: Body A in Fig. 6-34 weighs 98 N, and body B weighs 70 N. The coefficients of friction between A and the incline are ms = 0.50 and mk = 0.27. Angle is 48°. Let the positive direction of an x-axis be down the slope. What is the acceleration of A if A...
  8. H

    Newtonian Limit in G.R.: Differences Explained

    According to Sean Carroll’s Lecture Notes on General Relativity, equation (4.20) and text below, the Newtonian limit is obtained when g_{00} = -(1+2\phi). However, in Schutz’s “A first course in General Relativity” it is additionally required that g_{11} = g_{22} = g_{33} = (1+2\phi). I do not...
  9. 7

    Solving Newtonian Problems: Deciding When to Use + or - 9.8

    ex) you throw a baseball straght up. I returns after 3.5 sec. How fast did you throw it? i could then use x = x(initial) + v(initial)*3.5s + 1/2(-9.8)(3.5^2) and solve for initial velocity which comes out to be 17.5m/s. in this problem, 9.8 was negative and in some other problems, 9.8...
  10. A

    Barrier Tunneling & Newtonian Mechanics for Large Objects

    I am trying to figure how barrier tunneling can be reconciled with Newtonian mechanics for large objects. I know that Newton’s Law work for large objects but not for small ones. Can anyone tell me why?
  11. A

    Newtonian Probability Distributions

    How would the probability distribution (|psi|^2) look for a Newtonian particle if it were confined in a box?
  12. J

    Advanced books/papers on derivation of Newtonian mechanics from GR

    During many time i have searched a complete and rigorous derivation of Newtonian limit from GR but i found none. I suspect that it does not exist! I do not refer to that "supposed derivation" that appears in many textbooks of GR. I refer to a rigorous and unambigous derivation of Newtonian...
  13. S

    History of Newtonian Mechanics?

    I have been wondering how the classical mechanics that I study in my textbook today was framed. Newton gave his laws of motion, but what about vectors, who invented those. We deal with freely falling bodies and acceleration due to gravity while studing kinematics. But I know that the law of...
  14. C

    AP Physics B Multiple Choice Newtonian (1 prob)

    Hi guys, I need help with the following problem I couldn't figure out: 1) A block of mass 2 kg slides along a horizontal tabletop. A horizontal applied force of 12 N and a vertical applied force of 15 N act on the block. If the coefficient of kinetic friction between the block and the table...
  15. marlon

    Newtonian Mechanics, Motion on Inclines, Work Energy Theorem

    Let's start with the very base of Newtonian mechanics. It works like this : Suppose we work in two dimensions denoted by a x-axis and an y-axis. You can work in as many dimensions as you want because all you have to do is add a unit vector to the formula's, as you will see. Starting from the...
  16. R

    1-dimensional problem in Newtonian gravity- HELP

    1-dimensional problem in Newtonian gravity- HELP! The problem is this: Given sun of mass M and a body of mass m (M>>m) a distance r from the sun, find the time for the body to 'fall' into the sun (initially ignoring the radius of the sun). Our first equation is therefore \frac...
  17. R

    Problem in Newtonian gravity- 2nd order, integration problems

    The problem is this: Given sun of mass M and a body of mass m (M>>m) a distance r from the sun, find the time for the body to 'fall' into the sun (initially ignoring the radius of the sun). Our first equation is therefore \frac {d^2r}{dt^2} = \ddot{r} = \frac {GM}{r^2} . I am able to...
  18. R

    Newtonian Gravity- Body 'falling' into the sun integration problems

    The problem is this: Given sun of mass M and a body of mass m (M>>m) a distance r from the sun, find the time for the body to 'fall' into the sun (initially ignoring the radius of the sun). Our first equation is therefore \ddot{r} = \frac {GM}{r^2} . I am able to integrate this...
  19. DaveC426913

    Newtonian Physics tabletop demo

    I wish your help in creating a tabletop Newtonian physics demo. My friends do not believe that the centrifugal force is imaginary. They believe that, if you swing a pail of water in a circle over your head and let the rope go, the pail will sail *away* from you (as opposed to tangential to...
  20. S

    Newtonian Mechanics - Banked curves

    Hi, I'm having some trouble determining the formulae for banked curve problems, could somebody give me a general guideline on how to tackle these type of problems. My main problem is resolving the Normal reaction in terms of the angle of the inclined plain. Like i know that Ncos(angle) =...
  21. S

    Explaining Earth's Orbit Using a Geocentric Reference Frame

    Given the sun's mass (Ms = 2 x 10^30 kg) then Earth sun distnace (1.5 x 10^11 m) Newtons Constant G = 6.7 x 10^-11 Nm^2 kg^-2 use a GEOCENTRIC frame to explain the Earth's orbit (approcximate as a circle) This was a question on my test and at first sight i was shocked. But geocentric... if...
  22. S

    How Is the Period of Uniform Circular Motion Affected by Latitude?

    COnsider a large horizontal frictionless area on the Earth at phi degrees northern latitude. Through an impulse a particle is set in motion with velocity v and then left to move freely ignore all forms of friction. Find the period in the uniformcircular motion of the particle velocity v =...
  23. C

    Newtonian Mechanics: 2 Questions Answered

    I have two questions which I found difficulty in understanding: 1.) On a isosceles triangular-liked thing, with the base angles equal to 30 degrees, blocks X and Y are put on it on each side, with mass of X = 1kg, and mass of Y = 2kg, S is a spring balance of negligible mass( put on Y's...
  24. F

    Newtonian Gravitation with an extended body

    Hello, I'm having trouble with the following question: There is a spherical hollow inside a lead sphere of radius R ; the surface of the hollow passes through the center of the sphere and touches the right side of the sphere. The mass of the sphere before hollowing was M . With what...
  25. P

    Newtonian Problems #4 - Still Struggling

    I have moved onto kinetic energy and momentum which I thought I understand. Apparently I need more assistance. Please review my questions and answers. Any suggestions and help will be appreciated. Thanks. 1. A sports car with a mass of 1000 kg travels down the road with a speed of 2 m/s...
  26. M

    Mastering Hard Problems in Newtonian Mechanics: Tips and Tricks

    Ok, this is a pretty hard problem I don't really know how to start. The set up is as follows, there is a block M and on the top edge of it there is a pulley, set up ontop of mass M is a mass m1, and that's connected to mass m2 that is on the right hand side of mass M. There is no friction and...
  27. G

    Relativity vs Newtonian Physics

    I read in a book that relativity and Newtonian physics don't work with each other or something like that. Like when Einstein founded Relativity, Newtonian physics were partialy disregarded because Newtonian physics didn't account for relativity. Can Newtonian physics be like converted to work...
  28. P

    Why Am I Struggling with Newtonian Physics Concepts?

    :confused: I need more help please. I am moving along slowly in my physics quest to understand. The readings are more difficult and my understanding comes in and out. Please review, see how I did (answers marked with *) and make comments to help me learn. Thanks. 1. Which of the...
  29. P

    What Are Some Basic Newtonian Problems?

    Please review the correctness of these basics physics questions. Add any comments or helpful hints to help my rudimentary understanding. I am truly a "physics novice." Thanks. Physics Problems – Round 2 1. An object moves with a constant speed of 20 meters per second on a circular...
  30. P

    Grasping the Basics of Newtonian Physics: A Quick Review

    Hello Everyone. This is my second posting regarding some introductory physics questions. I am studying physics and taking an on-line course. The last time that I posted I did so under classic physics. I thought that I would also try general physics. I hope this is not too fundamental for...
  31. P

    Why Does Newtonian Physics Say About Object Motion and Forces?

    Can someone help me with these questions. I am a beginner in the study of physics and would like some help. I have attempted to answer these but would like to know if I am correct and a brief (very brief) explanation. Thanks in advance for your assistance. An object maintains its state of...
  32. R

    Comparing Newtonian & Quantum Physics: Resources & Sites

    hola. i have to do a report comparing Newtonian physics to quantum physics. are there any good sites or other resources that you know of? thanks
  33. mindcircus

    Solving Newtonian Mechanics: Find Expression for Speed v(t)

    A boat with initial speed v is launched on a lake. The boat is slowed by the water by a force, F=-ke^(bv). Find the expression for speed v(t). I've done the problem, but my answer seems too odd to be right...it may be my calculus. I've drawn a FBD, with the normal force and weight...
  34. J

    Newtonian mechanics on a particle

    Say that a particle of mass m slides down an inclined plane under the influence of gravity. If he motion is resisted by a force f=kmv^2, how canyou show that the time requied to move a distanc d after starting form rest is t= cosh^-1(e^kd)/(sqrt kg sin theta) where theta is the angle f...
  35. Ivan Seeking

    Connection of Newtonian Constant of Gravitation G and Plank Constant h

    I ran across this paper some time ago. I would be interested in any comments that you may have. http://www.laboratory.ru/articl/hypo/eax060.htm
  36. L

    Thorny Newtonian motion of a spaceship

    Hi, I am programming a game that involves controlling spaceships with a top-down 2d dimensional view. I want this game to have as realistic a physics model as possible. The idea is that you select a ship and then click on a destination. The ship then turns to an appropriate heading (turning...
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