What is 1d: Definition and 417 Discussions

The Canon EOS-1D X is a professional digital SLR camera body by Canon Inc. It succeeded the company's previous flagship Canon EOS-1Ds Mark III and the Canon EOS-1D Mark IV. It was announced on 18 October 2011.It was released in March 2012 with a suggested retail price of US$6,799.00 (body only) and a suggested retail price of £5,299 in the United Kingdom.The camera is supplemented by the Canon EOS-1D C, a movie-oriented camera that shares most of its still photographic features with the 1D X. The 1D C was announced in April 2012 and released in March 2013.In CES (January) 2014, Canon released firmware version 2.0.3 with significant improvements:
Initial AF point selection and 61-point auto selection AF synchronization
AF point switching according to camera orientation
Improved low-light performance
Expanded minimum shutter speed in auto ISOOn 1 February 2016, Canon introduced the Canon EOS-1D X Mark II as the successor to the EOS-1D X.

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  1. P

    How Do You Solve Complex 1D Motion Problems in Physics?

    Problem 1 A commuter train travels between two downtown stations. Because the stations are only 1.00 km apart, the train never reaches its maximum possible cruising speed. During rush hour the engineer minimizes the travel interval Δt between the two stations by accelerating for a time interval...
  2. N

    Knights' Collision: Solving a 1D Kinematics Problem for Homework

    Homework Statement In a historical movie, two knights on horseback start from rest 62 m apart and ride directly toward each other to do battle. Sir George's accleration has a magnitude of 0.21 m/s2, while Sir Alfred's has a magnitude of 0.26 m/s2. How far from Sir George's starting point do...
  3. S

    Energy levels in finite 1d well

    could anyone suggest the methods for solving the energy eigenvalues in a 1d finite potential well. are there any websites where we can directly get these instead of writing programs for rootfinding
  4. B

    Quantum mechanics: 1D potential well instananeously expanded to twice its size

    Homework Statement Consider a particle confined in a 1D potential well of length L. Derive the normalized wavefunctions and energies of the eigenstates of the system in terms of the quantum number n, working from the time independent Schördinger equation. With the particle initially in the...
  5. B

    Two interacting electrons in 1D infinite well

    Hi all, I've been looking at the problem of two interacting electrons in a 1D infinite well and wanted to run my conclusions past other people to see if I'm on the right track. The potential is 0 from x=0 to x=1 and infinite outside of this. The 1 particle solutions to this potential are...
  6. L

    Quantum - 1D crystal model using evenly spaced delta functions

    Homework Statement Hey, the question is about delta function potentials V(x) = -g[... del(x + 3b/2) + del(x + b/2) + del(x - b/2) ...] going on out to a large x in either direction. a) sketch the ground-state wave fn, write the form of psi(x) for -b/2 to + b/2 b) show that e^z =...
  7. J

    Solve 1D Simulation w/ Ruby w/ Self-Taught Programming

    I have just started programming (started on C but currently using Ruby). This is literally my first proper program and I wanted some help and opinions. The problem is I am completely self taught using various random tutorials to learn the language and my own logic for the actual programs, so...
  8. D

    Is \(\langle E \rangle \geq E_1\) Always True for a Particle in a 1D Box?

    Problem Show that for a particle in a one-dimensional box, in an arbitrary state \psi(x,0), \langle E \rangle \ge E_1. Under what conditions does the equality maintain? Solution Note that any arbitrary particle in a one-dimensional box can be expanded in terms of the eigenstates \phi_n =...
  9. 0

    Elastic Collision Solution: Solving for Final Velocities

    Homework Statement a .450kg ice puck moving east with a speed of 3 m/s has a head on collision with a .9 kg puck initially at rest. Assuming a perfectly elastic collision what will be the speed and direction of each object after the collision? Homework Equations v1 +v1f = v2+v2f...
  10. L

    Can every attractive 1D potential have at least one bound state?

    Hello: There is a well known theorem which asserts that every attractive 1D potential has at least one bound state; in addition, this theorem does not hold for the 2D or 3D cases. I've been looking for a proof in my textbooks on qm but I've been unable to find it. Can you help me out? Thanks!
  11. O

    Calculating Probability of Measuring +h/2 in 1D HO

    Hello everyone. I have a question that i think belongs here or in the linear algebra section; but now i put it here, maybe someone will move the post if it's in the wrong place. The question: I have a normalized (1D) state in the x-axis in the harmonic oscillator...
  12. B

    Verifying 1D Heat Diffusion PDE Solutions

    I have trying solving this PDE for some random boundary values, and were wondering if someone could verify my calculations? \[ \begin{array}{l} T_t = DT_{xx} \\ T\left( {0,t} \right) = 0,T(\pi ,t) = 0,T(x,0) = \frac{1}{4}\left( {\left( {x - \frac{\pi }{2}} \right)^2 + \frac{{\pi ^2...
  13. M

    Very beginner physics 1D motion question

    [SOLVED] Very beginner physics 1D motion question! Homework Statement Two cars move in opposite directions toward each other on a level, straight, one-lane road. When both drivers begin to brake, their front bumpers are 275 meters apart. The smaller car is initially moving at 25.0 m/s and the...
  14. E

    Constructing Wave Function for Particle in 1D Box: Is it Unique?

    For a particle in a 1-dimensional box confined by 0<x<a. a)Construct a wave function phi(x)=psi(x,t=0) such that when an energy measurement is made on the particle in this state at t=0, the following energy values are obtained with the probabilities shown: Energy E_n Obtained ...
  15. C

    Solution to diffusion equation in 1d spherical polar coordinates

    Ok, I have been given the steady state diffusion equation in 1d spherical polar coordinates as; D.1/(r^2).'partial'd/dr(r^2.'partial'dc/dr)=0 I know that the solution comes in the form c(r) = A+B/r where A and B are some constants. I just don't know how to get from here to there. I...
  16. M

    Diffusion equation question in 1D?

    Homework Statement The solution to the diffusion equation in 1D may be written as follows: n'(x,t) = N/sqrt(4piDt) * exp(-x^2/4DT) where n'(x,t) is the concentration of the particles at position x at time t, N is the total number of particles and D is the diffusion coefficient. a)...
  17. L

    Finding the value of the coefficient of elasticity for a 1D collision.

    Hi all first post. Myself and my friends are very much stumped by this question. Any help would be much appreciated! Homework Statement A body with mass m collides directly with a body of mass 3m. If two thirds of the original kinetic energy is lost, find the coefficient of elasticity for...
  18. S

    Understanding Intensity of Plane SHW in 1D, 2D, and 3D

    I am in eleventh standard , In my book it is given about the plane progressive simple harmonic wave , later somewhere is mentioned about intensity of wave what my doubt is intensity is defined as energy/area but what about waves in 2d or 1d plane SHW are 1d as wave progresses in x-axis...
  19. G

    From 1D to cylindrical co-ordinates in PDEs

    Hi all, I have another post on here relating to Fick's law of diffusion, but before I asked that I really should have started with this question: How do you go from a one dimensional version of the diffusion equation to a cylindrical co-ordinate system of the same equation? I have found...
  20. S

    When does the particle reach its maximum x position?

    Homework Statement The position of a particle moving along the x-axis depends on the time according to the equation x = ct2 - bt3, where x is in meters and t in seconds. For the following, let the numerical values of c and b be 3.5 and 1.0 respectively. (b) At what time does the...
  21. J

    Solve for the Intersection Point of Two Projectiles with Given Initial Velocity

    Hi, I have a physics problem here that I'm quite stuck on. Maybe I'm making it harder than it seems: A ball is thrown upward with an initial speed, Vo. When it reaches the top of its flight, at a height h, a second ball is thrown at the same initial velocity. Find the height where the paths...
  22. A

    Quantum Mechanics 1D Harmonic Oscillator Simulator

    Hi. I have recently designed a simulator about Qunatum Mechanics one dimensional harmonic oscillator. Please try it. I will be glad to read your opinions. http://erham.persiangig.ir/Programs/1386/QM1DHOS10.png Size: 223 KB http://erham.persiangig.ir/Programs/1386/QM1DHOS10.zip"
  23. K

    Probability of Finding Particle in New Potential for Doubled Spring Constant

    Homework Statement particle in ground state of 1D harmonic oscillator - spring constant is doubled - what is the probability of finding the particle in the ground state of the new potential Homework Equations v=1/2kx^2 oscillator potential wavefunction ground state n=0 =...
  24. A

    Solving 1D Motion: How Fast Must a Police Car Go to Catch a Holdup Car?

    Homework Statement A police car leaves in pursuit of a holdup car 0.50 h after the latter has left the scene of the crime at 120 km/h. How fast must the police car go if it is to catch up with the holdup car in 1.00h? Homework EquationsI'm thinking Vf=Vo+at? i must be wrong, I can't seem to...
  25. F

    Solving 1D Motion Problems with Fun: Average Rate and Time Calculations

    FUN 1d motion prob--help Homework Statement The figure (http://img471.imageshack.us/my.php?image=picprobfd5.png) shows a general situation where a stream of people attempt to escape through a door that is closed. The people move toward the door at a speed of v = 3.50 m/s, are each d = .25 m...
  26. D

    Solving 1D Schrodinger Eq. for Energies < V0

    For the well shown below (Attachment or Link belew) solve the time independent one dimensional Schrodinger equation for energies less than V0. You may (and should) leave your answer in terms of a single transcendental equation for the allowed wave numbers. \frac{-\hbar^2}{2m} ...
  27. M

    Solving 3 Body Problem in 1D: Tips for Calculating Motion of Mass C

    Homework Statement if 3 identical objects with mass m are conneted by springs of spring constant k, moving in 1D. At t=0, the masses are at rest at their equilibrium. position. Mass A is then subjected to an external force. A -> B -> C Where A, B, C are the masses and -> represents the...
  28. zimo

    Simple three charges problem in 1D

    Homework Statement Two charges are on the X axis as follows: q1=3x10^-9 C at x=0.4metre and q2=5x10^-9 C at x=-0.2m. What is the size and direction of the sum of forces are on third charge q3=-2x10^-9 C at x=0? Homework Equations F=k|q1q2|/r^2 The Attempt at a Solution By my...
  29. S

    Why Does the Displacement Formula Include a 1/2 Factor in Physics?

    I have just started out with Physics, so please don't expect to much :) I've tried by myself to figure out where x = vt + ½t² comes from; I know (because I've read) how to deduce it from a v versus t graph, and that it only works with a constant acceleration. My question is as follows...
  30. T

    1D Kinematics : Speed & Distance

    Homework Statement Two boats start together and race across a 42 km wide lake and back. Boat A goes across at 42 km/h and returns at 42 km/h. Boat B goes across at 21 km/h, and its crew, realizing how far behind it is getting, returns at 63 km/h. Turnaround times are negligible, and the boat...
  31. C

    Probably Simple 1D Kinematics problem

    Homework Statement To find the height of an overhead power line, you throw a ball straight upward. The ball passes the line on the way up after 0.70 s, and passes it again on the way down 1.2 s after it was tossed What is the height of the power line? m What is the initial speed of...
  32. W

    Correlation function, 1d polymer

    Homework Statement 1D polymer, fixed segment length a If the angle between segment j and j+1 is 0, the energy is 0 If the angle is pi the energy is +2J. Compute the correlation function <s_i s_{i+n}>, where s_j = \pm 1 denotes the direction of segment j Find the persistence length Lp...
  33. M

    Proving Symmetry of Solutions in 1D Potential

    Hi! I read that in an 1D potential, the solution for the Schrödinger equation is always either symmetric or antisymmetric if the potential is a symmetric function: V(x) = V(-x). How can I proof this? Thanks, for ur answers!
  34. P

    How Is the Number of Particles Calculated in a 1D Diffusion Slab?

    The solution to the diffusion equation in 1D may be written as follows: n'(x,t) = N/sqrt(4piDt) * exp(-x^2/4DT) where n'(x,t) is the concentration of the particles at position x at time t, N is the total number of particles and D is the diffusion coefficient. Write down an expression for the...
  35. P

    Frictional Forces and 1D Motion

    INTRODUCTION: This is a problem from my Introduction to Physical Science class using "Conceptual Physics" 10th Ed.by Paul G. Hewitt EXACT PROBLEM: "The coefficient of kinetic friction between a rubber tire and a wet concrete road is 0.5." PROBLEMS FACED: a) Find the minimum time in...
  36. M

    Can You Calculate the Reaction Time Needed to Avoid a Deer at 18 m/s?

    A motorist is traveling at 18 m/s^2 when he sees a deer 38 m ahead. If the maximum negative acceleration is -4.5 m/s^2, what is the reaction time (delta t) of the motorist that will allow him to avoid hitting the deer? Answer in units of 's'. I tried using x(t)=x0+v0t+1/2at^2 and it didn't...
  37. L

    Analyzing 1D Motion of a Particle in a Potential

    Consider the one dimensional motion of a particle in the potential V(x)=D(e^{-2ax}-2e^{-ax}). I'm supposed to obtain the expressions for x as a function of time separately for the cases that the total energy E is positive, zero or negative. I have used \frac{1}{2}m\dot{x}^2 + V(x) -...
  38. B

    Expressions for energy in 1d well

    Question states: Derive an expression for the energy of the bound states of a particle in the one-dimensional well defined by: V(x) = \infinity x<=0 (Region I) V(x) = 0 0<x<L (Region II) V(x) = V_0 x>=L (Region III) And its not been too bad. Up until a point. I know for I \psi(x)=0. In...
  39. K

    Maximum Distance? 1d Kinematics

    A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 4.5 m/s. The car is a distance d away. The bear is 24 m behind the tourist and running at 6.0 m/s. The tourist reaches the car safely. What is the maximum possible value for d? In meters. I...
  40. K

    Acceleration - Rocket 1d Kinematics

    Acceleration -- Rocket 1d Kinematics NASA has developed Deep-Space 1 (DS-1), a spacecraft that is scheduled to rendezvous with the asteroid named 1992 KD (which orbits the sun millions of miles from the earth). The propulsion system of DS-1 works by ejecting high-speed argon ions out the rear...
  41. K

    What is the boat's speed after an additional 2.6 seconds have elapsed?

    Starting from rest, a speedboat reaches a speed of 3.4 m/s in 1.8 s. What is the boat's speed after an additional 2.6 s has elapsed, assuming the boat's acceleration remains the same? I have tried finding the velocity for the first 1.8 seconds v = v_0 + a t 3.4 = 0 + a(1.8) 3.4 / 1.8...
  42. K

    1d Kinematics, bridge jumping.

    Bond is standing on a bridge, 10 m above the road below, and his pursuers are getting too close for comfort. He spots an approaching flatbed truck loaded with mattresses and decides to jump from the bridge onto the truck to make his getaway. He notes that the telephone poles the truck is passing...
  43. K

    Rocket's Max Height: Model Rocket w/ 70.0 m/s Initial Speed

    A model rocket is launched straight upward with an initial speed of 70.0 m/s. It accelerates with a constant upward acceleration of 1.00 m/s2 until its engines stop at an altitude of 190 m. (a) What is the maximum height reached by the rocket? m I don't know what I am doing wrong...
  44. K

    1d Kinematics, missing something.

    A person who walks for exercise produces the position-time graph given with this problem. (b) Calculate the average velocity for each segment to verify your answers to part (a). A m/s B m/s C m/s D m/s B is obviously 0 For A I did .20 of an hour is 300 seconds. And 1km =...
  45. B

    Solution of 1D Schrodinger using discretized hamiltonian

    Hi all, I'm trying to solve the 1D Schrodinger equation for an arbritary potential, to calculate Franck Condon factors for absorption and emmision spectra. I can do this using iterative techniques (e.g. the Numerov method), but I can't seem to get it to work by discretrizing the hamiltonian...
  46. S

    1D infinite square well and parity

    I think I'm on the right track for this problem, but I'm not entirely sure. Find the solutions to the one-dimensional infinite square well when the potential extends from -a/2 to +a/2 instead of 0 to +a. Is the potential invariant with respect to parity? Are the wave functions? Discuss the...
  47. G

    1D infinite potential well with origin shift

    Hi guys, I am solving the 1D infinite potential well for a particle, but in this case instead of the potential being 0 from -a to a, its shifted to 0 to 2a. I have calculated that the even parity solution is zero. My question is, I have calculated that k=n*Pi/(2*a) by applying the boundary...
  48. R

    1d Kinematics formula question

    Could someone please help me in determine the correct formula(s) to answer this problem? A helicopter is ascending vertically with a speed of 2.50 m/s. At a height of 120 m above the Earth, a package is dropped from a window. How much time does it take for the package to reach the ground...
  49. S

    Solving 1D Wave Equation w/ Initial Values

    given the initial boundary value problem u_{tt} - u_{xx} = 0 , 0<x<1, t>0, u(x,0) =1 , 0\leq x \leq 1 , u_{t}(x,0) = \sin(\pi x) , 0\leq x \leq 1 , u_{x} (0,t) = 0 , t \geq 0 , u_{x} (1,t) = 0 . find u(0.5,1). Where u is d'Alembert's solution for the 1D wave equation well f(x)...
  50. H

    1D Time-Indep Sch Equation Solutions

    1D Time-Indep Sch Equation Solutions... I'm trying to write a C++ program which displays a 'moveable' graph showing the solution (wavefunctions) to the Schrodinger Equation for a Simple Harmonic Oscillator. I need a little help with the physics of it. The idea is that (using the mouse) the...
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