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. S

    Viscosity Displacement Velocity Time relation

    If I were to drop a ball down a fluid with high viscosity, the ball decelerates over time and then reaches close to terminal velocity. How does displacement and velocity relates with time in terms of mathematical equation? Am I right to say: v(t) = Vterminal(1 - exp(-bt)) d(t) = Vterminal*t(1 -...
  2. N

    2 Questions about motion in 1 direction

    So I have 2 questions to answer for my physics class and I'm not quite sure what to do. Here are the two questions and I was wondering if someone could possibly point me in the right direction. I'm not asking for the answers I just kind of want a rough idea of where to start. Thank you 1. An...
  3. D

    Velocity x' as a function of x, subject to a force function

    Homework Statement Find the velocity x' as a function of the displacement x for a particle of mass m, which starts from rest at x =0, subject to the following force function: F0 + cx Homework Equations Fx = m d2x/dt2 ax=Fx/m=x''=v dv/dx The Attempt at a Solution So I'm pretty sure I'm doing...
  4. H

    Conduction and displacement currents for a spherical solid

    Homework Statement Show that the conduction and displacement currents cancel each other for a spherical radioactive solid emitting charged particles radially outwards Homework Equations Maxwell's equations Current density (j) Displacement current density (jd) The Attempt at a Solution I...
  5. applestrudle

    How do you solve this 2nd ODE for a pendulums displacement...

    ..when it is released from rest with velocity (v0, 0) I can get 1.6.5 but I can't get this:
  6. R

    How Accurate Are These Physics Experiment Measurements?

    On separate lines list each measurement name, average value ±uncertainty (readability or reason for uncertainty) EXAMPLE: Displacement, 0.100 - 1.600 meters ± 0.005 meters (σ precision for start and final position reading.) Consider Displacement a measurement instead of startP and finalP. Here...
  7. N

    How Can I Find Displacement With Only Velocity and Angle

    1. (Ignore air resistance) A rock is thrown 55% above the horizon at 30m/s. What is the horizontal displacement of the rock when it hits the ground?2. Can only use vf^2=vi^2+2ad and sohcahtoa3. Would it work to first draw a vector triangle and find the vertical velocity vector only. Then use...
  8. S

    Behavior of strings with displacement in the middle

    Homework Statement [/B] I have a string that's infinite on one side, as well as a string that's infinite on both sides. The displacement at the center (x=0) is the same for both, as shown in the pictures. Homework Equations [/B] I think the G term goes to 0 because there's no incoming wave...
  9. R

    Hello, I'm new to physics forums

    I'm a high school engineering physics student , my name is Nathaniel and I'm joining physics forums because I'd love to read about new things(New to me). I plan on having my own businesses in aerospace, architecture, mechanical, and electrical engineering. I want to achieve a PhD in aerospace...
  10. A

    MHB Water Displacement Volume question

    Sorry if this is the wrong category for this. I am mostly confused about this question because I thought that displaced water WAS the volume of any given object. I'm confused by the reasoning of the actual answer for this. Is there something I'm missing here?
  11. M

    Determine the displacement of the object

    Find the displacement on the position vs time The graph is here: https://session.masteringphysics.com/problemAsset/1925742/5/Mazur1e.ch2.p12.jpgMy attempted answers were: 5m, +5m
  12. En Joy

    I Wien's displacement law from Plank's formula

  13. Mr. Rho

    Outside the origin circular loop current density

    Hi, I'm trying to write the current density for such circular loop in spherical coordinates. For a circular loop of radius a that lies in the XY plane at the origin, the current density it's simply: \mathbf{J}= \frac{I}{2\pi\sin\theta}\delta(\theta-\frac{\pi}{2})\frac{\delta(r-a)}{a}\hat{\phi}...
  14. M

    Table for signs of position, displacement, and velocity

    Homework Statement Homework Equations Velocity = Displacment/Time The Attempt at a Solution Ok, so I thought this was straightforward at first, but I'm having my doubts. The position column, I filled out with the standard assumption the right and up are positive and left and down are...
  15. K

    Relating pavement roughness in frequency to displacement

    Hi all, I'm attempting to optimise a suspension system's spring and damping rate via vibrational analysis. Working in the frequency domain, I have calculated the input-output relationship as a ratio (i.e. ground to body, x/q2 in the attachment) and the mean square acceleration response based on...
  16. I

    Double Displacement Reaction: Predicting Products and Identifying Driving Force

    Homework Statement "The following reaction is a metathesis reaction. Please predict the products from the given reactants and label the driving force." Homework Equations MgO + HI -> ? [edited] The Attempt at a Solution MgO(aq) + HI(aq) -> MgI2(aq) + H2O(l) MgO being soluble because of the...
  17. fricke

    Coulomb's Law of Electric Displacement -- Why is there none?

    Why is there no Coulomb's Law for the electric displacement?
  18. fricke

    When is the Curl of Electric Displacement Zero?

    In what condition(s) curl of electric displacement is zero? Is it okay to say curl of electric displacement is zero in: 1) in electrostatics (curl of E is zero) then followed by the following conditions: 2) when there is no polarization (curl of P is zero) 3) in uniform polarization (which...
  19. I

    Calculating Displacement and Distance: A Particle's Motion in 4 Seconds

    If the displacement of a particle is given by x=(t-2)(t-2) if x is in mtrs and t in seconds the distance covered by the particle in 4 seconds is? I am not sure how to start. I know is S=ut+1/2at*t But not sure how to proceed. I am new member, would be grateful for your help.
  20. K

    What is the stretch of the spring?

    Homework Statement A spring scale hung from the ceiling stretches by 6.3 cm when a 1.2 kg mass is hung from it. The 1.2 kg mass is removed and replaced with a 1.4 kg mass. What is the stretch of the spring? F=mg U (spring force) = 1/2kx^2 Homework Equations The units of cm need to be...
  21. Viking89

    Trying to calculate barge capacity and displacement

    I am trying to calculate the capacity of Gabro (3g/cm3) in a barge that is 86.1 meters long, 21.6 meters wide, and 5.2 meters in depth. Additionally, the draft is 3.65 meters without any material. My cal is 3,187.8 tons. Is that correct and if so, how do I calculate the adds depth contributed...
  22. M

    MHB Maxwell's equations for displacement current

    A parallel plate capacitor with circular plates of radius R is being discharged. The displacement current of discharge through a central circular area, parallel to the plates and with radius R/2, is 2.0 A. What is the discharging current?
  23. T

    Displacement Problem: Solve 5th & 3rd Turn

    Homework Statement A man starts from "O" moves 500m , turns by 60° and moves 500m again again turns by 60° and moves 500m and so on. Find the displacement after 1) 5th turn 2) 3rd turn (assume each turn is clockwise from the man's point of view. Homework EquationsThe Attempt at a Solution...
  24. Ackbach

    MHB How do you find the direction of a displacement current?

    We know that the so-called displacement current is defined as $$i_d=\varepsilon_0 \, \frac{\partial\Phi_e}{\partial t}.$$ Like regular current which is the movement of charges, $i_d$ has a direction, even though it's technically a scalar. How do we find its direction?
  25. T

    Hydraulic Variable displacement piston Pump selection

    Hello everyone, I am designing one hydraulic system. In that system their is total 8 no of component function. When all the component work that time its take 150 Bar pressure and 140 lpm flow. but this all are all time not working together. they are hardly 4 to 5 time working together in day...
  26. N

    Ansys Displacement of a flexible part....

    Hello! I'm trying to simulate the displacement of a flexible part through two parts. But it's not passing through all the way out. It get stacked mid-way. Can someone help me, please. Here, I attached my file.
  27. Tony Stark

    Scalar Product of displacement four vector

    Homework Statement How does the scalar product of displacement four vector with itself give the square of the distance between them? Homework Equations (Δs)2= Δx.Δx ( s∈ distance, x∈ displacement four vector) or how ds2=ηαβdxαdxβ The Attempt at a Solution Clearly I am completely new to the...
  28. S

    Photon Displacement in EM Waves (Amplitude)

    I am curious on what is meant by amplitude in an EM wave. From all the searching I have done the amplitude has something to do with the density of photons in the EM wave, and the frequency with energy of the photons. The part I am confused about is the fact that the wave is oscillating. I...
  29. T

    Fluid Displacement: What Causes It?

    Hello, When an object is located inside a fluid, how it displaces the volume of the fluid? what is the cause of it ? Thank you
  30. D

    Displacement Operator: Exponential of Parameter & Vector?

    Hi . I've just encountered something called the displacement operator which is the exponential of a parameter multiplied by a vector but I thought the argument of an exponential had to be a scalar. Is this not true ?
  31. T

    How to Find Acceleration from a Velocity-Distance Graph?

    Homework Statement The V-S graph ( x-axis as S and y-axis as V)of a airplane on a runway is as follows: for 0-100 meters the velocity increases steadily in a straight line from 0-40 m/s. For the remaining 100 -200 meters, the velocity increases steadily from 40 -50m/s in a straight line...
  32. S

    Need help with physics magnitude and displacement

    1. A car is driven 80 km west and then 30 km 45 degrees south of west. What is the displacement of the car from the point of origin? (magnitude and displacement) 2. A delivery truck travels 18 blocks north, 10 blocks east, and then 20 blocks south. What is the trucks final displacement from its...
  33. D

    Modal Analysis of a Rotor Blade Using Simpack

    Hi everyone, I am relatively new to Simpack and would appreciate some help with getting started. Basically I am trying to obtain the displacement of a rotor blade as it rotates (I already have the model). I want to have the displacements of each modal shape along the entire blade radius. Now...
  34. Quotes

    Why do double displacement reaction occur?

    What's the reason for which double displacement reaction occur? Why there is a need for ion exchange between two compounds? They are already in a bonded state, a stabilised one. So what benefit would a double displacement reaction give? The ionic reaction AgNO3 +NaCl - - - - > AgCl(ppt) +...
  35. J

    Displacement of a point on a progressive wave

    Homework Statement Homework EquationsThe Attempt at a Solution I wrote that Y will have a negative displacement, before returning to equilibrium. Why is Y's displacement positive instead?
  36. A

    10 m dive. Time and horizontal displacement is known.

    Homework Statement A diver jumps from a 10 m platform.Time in air is 2.3 s. Horisontal displacement is 4 m. What is the divers initial velocity and angle? Homework Equations No idea :'( The Attempt at a Solution No idea :'(
  37. PWiz

    Infinitesimal displacement in spherical coordinates

    I'm trying to derive what ##ds^2## equals to in spherical coordinates. In Euclidean space, $$ds^2= dx^2+dy^2+dz^2$$ Where ##x=r \ cos\theta \ sin\phi## , ##y=r \ sin\theta \ sin\phi## , ##z=r \ cos\phi## (I'm using ##\phi## for the polar angle) For simplicity, let ##cos...
  38. md abul hasan

    A ball is thrown upward direction , is it a -ve displacement

    when a ball is thrown in upward direction --how can it be a negative displacement?
  39. D

    Area under force vs displacement graph :D?

    Homework Statement Find K at 4m, besides the F.s graph they also give me Kinitial = 2J Homework Equations W=F.d and W=Kf- Ki The Attempt at a Solution The first thing I did was to find the area under the graph. 1/2(4)(2)=4J W=F.d so that's my work. Then I replaced that 4J into the other eq...
  40. J

    How to measure displacement and Force simulatuously in Ansys Structural domain

    Hi i am performing a multiphysics simulation in which i am importing results of Electric-Thermal domain into Transient Structural domain in Ansys Workbench 14.5. As the simulation time is 5 hrs and given that i have to perform 20 case studies , so i want to know is their a way around in Ansys...
  41. Brendan Webb

    Finding the Magnitude and Direction of the Displacement Vector for a Ship's Trip

    A ship sails 130 km due north from island A to island B and then 92 km, in the direction 22° south of east, to island C. The ship after that returns directly to island A. Calculate the magnitude and direction of the displacement vector in the last trip. Draw appropriate diagrams. Homework...
  42. B

    Finding work with displacement and weight.

    Homework Statement Steve lifts a 5.0kg toolbox 0.5 meters off the ground. Compare the amount of work that would be done on Earth to the amount that would be done on the moon. Homework EquationsThe Attempt at a Solution (no idea what i am doing) work = force x displacement x = (5/a) (.5) cos 9.8
  43. N

    Finding Time with Acceleration Inital Velocity, Displacement

    Homework Statement Currently i am studying two dimensional collisions. In order to find the impact velocity of a vehicle so i can determine the momentum and etc. I have inital velocity=130km/h, displacement (or the braking distance)=54.34m and the deceleration = 11.9812m/s/s. I need to find the...
  44. R

    Electric Displacement (Gauss's Law)

    Homework Statement Two long, conducting cylinders of thin metal with radii ##R## and ##5R##, respectively, are arranged concentrically so that their axes coincide. The smaller cylinder is placed inside the larger one and the space between them is filled with a dielectric whose relative...
  45. F

    Solving Work Done Problems in Physics

    I'm having some trouble wrapping my head around a couple work concepts. I've been reading the following thread: https://www.physicsforums.com/threads/displacement-and-work.322461/ and I don't think I've fully grasped how work is accomplished. My first question is if I lifted a (w=3.0N) water...
  46. gracy

    Derivative of displacement with respect to time

    What's the difference between derivative of displacement with respect to time and derivative of position with respect to time ?I have read derivative of displacement with respect to time is velocity and derivative of position with respect to time is also velocity,so what's the difference? I...
  47. goonking

    Webpage title: Understanding Angular Displacement in Circular Motion

    Homework Statement I play swing a yo yo above my head in a circular horizontal motion. The yoyo travels around 370 degrees. what is the angular displacement? Homework EquationsThe Attempt at a Solution would I say the angular displacement is 10 degrees? or still 370 degrees? or would both...
  48. tony873004

    Angular Displacement: 2π Radians

    I walk around a circular track. My displacement is 0 because I'm back at my starting point. How about my angular displacement? Is it 2 pi radians, or is it also 0? The definitions I've been reading online seem to indicate that 2 pi radians is the answer.
  49. R

    Understanding the Concept of Work: Displacement of Force or Center of Mass?

    I am having trouble understanding the concept of work on an intuitive level. The equation is rather simple but the definition of displacement is vague (everywhere I looked it's just stated as displacement of the body in the direction of motion). The question is, is this the displacement of the...
  50. andyrk

    SHM: Equation relating acceleration and displacement

    A particle moves such that its acceleration is given by: a = -β(x-2). Here β is a positive constant and c is the distance from origin What is the time period of oscillation for the particle? Solution: a = 0 at x = 2 (mean position) a = -βX where X = x-2. So, ω2 = β ⇒ T = 2π/ω = 2π/√β My...
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