Displacement Definition and 999 Threads

The displacement or displacement tonnage of a ship is its weight. As the term indicates, it is measured indirectly, using Archimedes' principle, by first calculating the volume of water displaced by the ship, then converting that value into weight. Traditionally, various measurement rules have been in use, giving various measures in long tons. Today, metric tonnes are more commonly used.
Ship displacement varies by a vessel's degree of load, from its empty weight as designed (known as "lightweight tonnage") to its maximum load. Numerous specific terms are used to describe varying levels of load and trim, detailed below.
Ship displacement should not be confused with measurements of volume or capacity typically used for commercial vessels and measured by tonnage: net tonnage and gross tonnage.

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  1. J

    Displacement of a voigt model and a mass in series

    Homework Statement A Voigt model in series with a mass is given (so Wall: (mass and damper in parallel) -- mass -- Force ---> ) with a force, F = Fo*cos(ωt) exciting/driving the system. Givens: Spring constant: K, Viscous constant: η, Mass element: m Find a solution for established...
  2. S

    Sacrificial metals and displacement of metals

    When I want to prevent iron from rusting, I use a more reactive metal such as magnesium and connect it to the iron. This protects iron from being rusted as the magnesium will transfer electrons into the iron when it rusts, thus reducing Fe2O3 into Fe metal. However, Mg will be oxidised to Mg2+...
  3. S

    Metal oxides displacement reaction

    When a more reactive metal displaces a solid metal oxide, a lot if heat is required for the reaction to occur. However, both metal and metal oxide can be solid for the reaction to take place right?
  4. P

    How Does the Displacement Equation Calculate Position Changes in Physics?

    We can have the velocity as v1 or v2 , time also, but In some cases i see it in displacement for e.x ##x=x_0+v_0 t + \frac{1}{2} at^2##, how can it be displacement 1 , displacement 2, can some one explain? Is it the displacement of the body 1, and displacement of the body 2 or what?
  5. B

    Help with Physics - Object submerged, displacement, density, pressure?

    I have a few physics problems I need help with. Please show work or I won't know how to do it. My book has no example problems. 1. Suppose you balance a 5kg ball on the tip of your finger, which has an area of 1 cm^2. Show that the pressure on your finger is 49N/cm^2, which is 490kPa...
  6. R

    SHM: Which is amplitude and which is displacement?

    Homework Statement Calculate acceleration and velocity of a piston. Stroke is 150mm and engine speed 3500rpm Using simple harmonic motion equations Homework Equations a = -ω^2*s v = ω*√A^2 - s^2 ω = 2*∏*f v = velocity, a =...
  7. Z

    Doubt as to application of Wien's displacement law

    Do Wien's displacement law hold true even for bodies with emissivity not equal to 1, that is, non-black bodies?
  8. S

    Electron displacement between two parallel plates

    The problem is attached, stuck on part d. Homework Statement Im given a problem with two horizontal and parallel plates 8cm long 3cm away from each other. An electron is moving through them with a velocity V_{0}. It is also given that the voltage across the plates is 20 Volts and the...
  9. xortan

    Slope and displacement of a triangle beam

    Homework Statement I have attached a picture of the problem. Homework Equations Singularity functions? The Attempt at a Solution So I am an electrical engineering student and got this mechanics course this semester and the teacher hasnt really explained anything, its almost like...
  10. D

    Displacement of air particles.

    Is it possible for particles of air to be displaced by an organism and as the organism increases in size and mass the higher the displacement?
  11. P

    Archived Displacement and Momentum, particle in cathode ray tube with variables

    Homework Statement In a cathode ray tube (CRT) used in older television sets and oscilloscopes, a beam of electrons is steered to different placed on a phosphor screen, which glows at locations hit by electrons. The CRT is evacuated, so there are few gas molecules present for the electrons to...
  12. S

    Using Vectors to Find Displacement and Angle

    Homework Statement A person walks in the following pattern: 4.1 km north, then 2.0 km west, and finally 2.5 km south. Homework Equations (a) How far (in km) and (b) at what angle (measured counterclockwise from east) would a bird fly in a straight line from the same starting point to the same...
  13. S

    Angular displacement is not a vector

    Homework Statement The angular displacement θ, despite having a magnitude and a direction, cannot be treated as a vector. This is because θ does not follow the commutative law of vector addition. Does the infinitesimal displacement dθ obey the commutative law of addition and hence qualify...
  14. K

    Magnitude of Displacement problem

    Homework Statement A room has dimensions 3.15 m (height) 3.85 (width) m 4.10 (length) m. A fly starting at one corner flies around, ending up at the diagonally opposite corner. (a) What is the magnitude of its displacement? (solved and got 6.45m) (b) Could the length of its path be less...
  15. D

    "Zero Displacement at Time t=? - Solve for t

    Homework Statement A body experiences acceleration "a" given by the expression a=At-Bt^2 where A and B are constants and t is time. If at time t=0, the body has zero displacement and velocity, at what next value of time does the body again have zero displacement?Homework Equations a is in...
  16. M

    Finding Horizontal Displacement for Spring Cannon Launch

    A spring cannon is located at the edge of a table that is 1.2 m above the floor. A steel ball is launched from the cannon with speed Vo at 35.0 degrees above the horizontal. (a) Find the horizontal displacement component of the ball tothe point where it lands on the floor as a function of Vo...
  17. B

    Rate of displacement of individual gas molecule help

    Has anyone made a calculation for example, how much (or the mean) time it takes for an individual gas molecule to be displaced a distance of one meter (measured straight) from its original location? For example, air molecule at ambient pressure with a mean free path of 68 nm. That would be...
  18. L

    Difference between Position Vector & Displacement Vector? (no calculatins)

    Difference between "Position Vector" & "Displacement Vector?" (no calculatins..) http://en.wikipedia.org/wiki/Position_(vector ) http://en.wikipedia.org/wiki/Displacement_(vector ) Is the position vector simply an initial vector given by coordinates (x,y) or (x,y,z) such as (8,4) or...
  19. M

    Calculating Electric Flux of Displacement Vector w/ Cylindrical Co-ords

    Using cylindrical co-ordinates (r, theta, z), calculate the electric flux phi=integral D . dS when the displacement vector D is given by: D=10ezcos(theta)/r2 . kr + z2sin(theta)/r2 . Kz and the surface S is part of a cylinder of radius a=0.3, defined by 0 is less than or equal to z which is...
  20. H

    What Is the Displacement of the Wandering Wolf?

    Homework Statement A wolf wanders 64 m [N15E], 93m[N20W], and 167 m [N]. What is her displacement? North to South east is considered positive by my sign convention, and from south to north west, it is considered to be negative, once again by my sign convention. I've never seen problems like...
  21. B

    Final Displacement: 5 Blocks, 53 Degrees E of N - Homework Question Explained

    Homework Statement What is your final displacement if you walk 3 blocks east, then 4 blocks north? 7 blocks, northeast 5 blocks, 53degrees N of E 5 blocks, 53degrees E of N 1 block, north Homework Equations square root of 3^2 + 4^2 = square root of 25 d= 5...
  22. T

    Examining Wave Displacement Along a Spring

    Homework Statement A wave is sent along a long spring by moving the left end rapidly to the right and keeping it there. The figure shows the wave pulse at QR - part RS of the long spring is as yet undisturbed.Which of the graphs correctly shows the relation between the original position x of...
  23. P

    Interperting displacement vs time graph

    I'm having a conceptual problem and having a hard time putting it into words. I think I'm assuming a lot of things have confused the sh*t out of myself. Sorry if this is really confusing and flawed in logic. So, let's say we have a graph and it's displacement versus time. The slope of the...
  24. S

    Qausi-static displacement current (Purcell)

    "Qausi-static" displacement current (Purcell) Hello all, On page 329, chapter 9 of Purcell's E&M book, he describes why the "displacement current" produces nearly zero magnetic field for slowly varying fields. By taking the curl of the displacement current Jd, he shows that...
  25. K

    Can magnet fields deflect displacement currents?

    Can magnet fields deflect displacement currents? Could displacement currents be made to propagate in spirals like those in a cyclotron? Do they travel close to the speed of light? Can they be focused into beams? Can they transmit electrical energy at a distance? Are they subject to the same...
  26. H

    How to Determine Moment Using the Method of Virtual Displacements?

    http://img267.imageshack.us/img267/9636/qw5e64a2d1sda54.png Hi guys. i have a question that needs verification. Referring to the above diagram, Please determine the Moment, M (Nm) needed in order to hold the mechanism in equilibrium state as shown above by using "Method of Virtual...
  27. C

    Taking the derivative of displacement

    Homework Statement how does y= y0 + v0t + 1/2 at2 become v = v0 + at ? know v= dy/dt Homework Equations The Attempt at a Solution dy/dt = dyo/dt + v0 + at v= vo + vo +at v= 2vo + at
  28. J

    Draw displacement time graph from velocity time graph

    hey there, I'm a little confuse on how to draw a s-t graph from a v-t graph :( based on the graph attached, the displacement of C is lesser than D, but why the s-t graph is not like in a 'bell' shape ( curve down from D to C) ? instead it went up? if the question were to ask for a...
  29. L

    What is the magnitude and angle of displacement given three vectors?

    Homework Statement Compute the magnitude of the displacement (\vec{}R and the angle with respect to the x-axis. Homework Equations The Attempt at a Solution A = 10m * sin30° \hat{}y+ 10m * cos30° \hat{}x \vec{}A = 5m \hat{}y + 8.66m \hat{}x B = 15m C = 20m * sin80°...
  30. G

    Find Displacement Amplitude for 79.8dB Wave

    The highest note written for a singer in a published score was F-sharp above high C, 1.48 kHz, for Zerbinetta in the original version of Richard Strauss's opera Ariadne auf Naxos. The wavelength of this wave is 0.232m. Suppose people in the fourth row of seats hear this note with level 79.8...
  31. O

    How to calculate displacement from distance?

    the distance from Islamabad to my hometown "sialkot" is 300km. if i use helicopter what would be the displacement ? Thank you!
  32. J

    Displacement with and without friction

    [b]1. When someone gets shot out of a human cannon with an initial velocity of 15 m/s and they have a mass of 60 kg. Final velocity is 0. Maximum constant force is 3000 N. This is free fall so acceleration is 10 m/s^2. There is no friction. So when you look at my attempt in solution I got the...
  33. R

    What is the angle of displacement from the vertical for a hanging mass on Earth?

    Homework Statement Find an expression for the angle of displacement from the vertical with which a mass hangs in the gravitational field of the Earth as a function of latitude λ. Homework Equations The Attempt at a Solution I don't even understand what the question is, can...
  34. V

    Displacement current vs eddy current

    Hello, I'm new on this forum. I hope I could help some of you next days. But today I have a question for you. I have a geophysics oral exam on wednesday. The course material is not clear, and I don't understand the wikipedia pages. What is the physical difference between displacement current...
  35. P

    Physics : force versus displacement?

    -------------------------------------------------------------------------------- In the graph below, forces labelled positive act in the direction of motion of the object, forces labelled negative oppose the motion. The object under consideration has a mass of 2.0kg and was initially at rest...
  36. P

    Force vs. Displacement graph question

    In the graph below, forces labelled positive act in the direction of motion of the object, forces labelled negative oppose the motion. The object under consideration has a mass of 2.0kg and was initially at rest. Calculate its kinetic energy and speed when a) d= 2.0m b) d= 4.0m c) d=6.0m d)...
  37. M

    Calculating Reflected Light Displacement in Glass

    Homework Statement A beam of light makes an angle of 26 o with the normal of a mirror made of 2.4- mm-thick glass silvered on the back. If the index of refraction of the glass is 1.50, how far is the point at which the beam leaves the glass surface (after being reflected from the silver...
  38. T

    Solving Max Displacement of Spring with 5kg Block and Friction

    Homework Statement block of mass m = 5 kg is connected to a spring having stiffness constant k = 49 N/m, as shown in the figure below. The surface between the block and the table has μk = 0.1 In this figure, the block is presently held in place with the spring stretched by x1 = 0.8 m...
  39. nukeman

    Vector Notation with force and displacement help. Thanks

    Homework Statement This is not a homework question, but rather a review question. I have the answer, ill post below, but have no idea how to get to the answer :) Question: "A constant force of 90.0N acts on a ball while it has a displacement of 1.40m at 10 degrees below the x-axis. The...
  40. 0

    Harmonic, displacement and input power factor

    1. A single phase half controlled bridge rectifier operated from a120V 60Hz ac supply. The load current with an average value of I is continuous and negligible ripple content. If the delay angle of thyristors is 60, calculate, i) The harmonic factor of the input current...
  41. D

    Displacement x of simple harmonic oscillation

    Homework Statement The amplitude of simple harmonic oscillation is A = 10 cm. Find a displacement x when K = 1/6 U. Here K is a kinetic energy and U is a potential energy. Homework Equations KE = \frac{1}{2} k A^2 U = \frac{1}{2} k x^2 The Attempt at a Solution I'm not sure the...
  42. V

    How to Calculate Work When Force Components Are Given?

    [b]1. Homework Statement What should be the value of Work,if vertical component is 2/3 time to the horizontal component of the applied force,while displacement covered in the direction of applied force is X meters? Homework Equations W=F.d.....(1) The Attempt at a Solution IF...
  43. C

    Vectors - Displacement to Accelleration

    Homework Statement An object moves with its position obeying x=5t^2-6t^2 and y=3t^-1+4t^4. What is the magnitude of its acceleration at t=1s; a)57 m/s^2 b)34 m/s^2 c)26 m/s^2 d)44 m/s^2 e)0 m/s^2Homework Equations x=5t^3-6t^2 y=3t^-1+4t^4 The Attempt at a Solution Second derivative of the...
  44. M

    Calculating Angular Displacement

    Homework Statement I'm trying to calculate the angular displacement. A pendulum with length L is released at θ=0.10rad at 0s. Really not sure how to calculate the angular displacement from this. In a previous question we calculated the values of omega, and phi. Homework Equations I...
  45. X

    Solving a Mini-Lab Homework Problem on Velocity and Displacement

    Homework Statement For my class we did a mini-lab that asked us to stand still and long jump. Kind of confused about how to solve because our teacher is horrible. I am supposed to calculate the vertical velocity at take off (which I thought was 0m/s but someone told me it's at the peak of the...
  46. K

    Finding the displacement of a object as viewed through water

    hi everybody, suppose we are viewing an object in a pool whereby the object is actually at the bottom of the pool, ...so it will appear as if it has been displaced. what formula can we use to calculate the displacement of the object...?? are there any conditions applicable..help me with this...
  47. L

    Box on a string, find displacement when first at rest

    Homework Statement A block with mass m = 3.57 kg is attached to a spring with spring constant k = 165.7 N/m and negligible mass. The coefficient of kinetic friction between the block and the table is µk = 0.239. The box is displaced from its equilibrium position to the left by 0.216 m. If the...
  48. C

    Vector Addition: Finding Displacement

    I am having a lot of trouble with my homework. If anyone could help me, it would be much appreciated. The Smith's go on vacation. They travel 16.0 km north/west; then turn 27 degrees to the left and go 135 km; then 294 km south/west. What is their displacement from home? So I found the X...
  49. C

    Help Needed: Calculating Displacement with Physics Homework

    Having trouble with my physics homework, if anyone could please help me with how to this, that would be awesome. My teacher says we are supposed to find the X and Y componenets and then add them, but I don't know how to find them. The Smith's go on vacation. They travel 16.0 km north/west...
  50. S

    Finding Displacement with angles and directions

    Homework Statement I am having a nightmare doing homework for my physics test. I have figured out part of the answer but can not figure out what the angle of the displacement is and its driving me crazy... The teacher showed us two methods of how to find the answers, but ended up making...
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