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. P

    Molniya Orbit: calc angular displacement of ascending node

    Hello there :), Homework Statement We have a molniya orbit with an eccentricity of e = 0.72 and a semi-major axis a = 26554 [km]. The task: Calculate the angular displacement of the ascending node Ω after 100 sidereal days Homework Equations Moreover I know from Wikipedia that a...
  2. E

    Work is force into distance or displacement

    Respected all, If i push an object on the floor and drag it say 2 m in a straight line with force y. then the work done is force times displacement. that is 2y. first doubt which formula is correct one work = force multiplied by displacement or work = force multiplied by...
  3. M

    Virtual displacement vs. differential displacement

    So what exactly is the difference between these two things? I understand their individual uses perfectly well, I think (or perhaps hope), but I'm a little unclear on what exactly a virtual displacement is. is it just a sort of imagined displacement that can't really occur, while a differential...
  4. K

    Finding the time at which the displacement is a Maximum - Calculus

    Homework Statement A damped oscillator has a displacement x as a function of time t given by x = e-t cos(∏t). Find the time at which the displacement is a maximum, when it is a minimum, and also nd the time when x is a point of inflection. Homework Equations x = e-t cos(∏t) The...
  5. M

    Calculating Displacement for Cody and Megan

    Homework Statement 3. Cody and Megan were trying to find a new tattoo parlor. They walked 58 m north and 32 m west. What was their resultant displacement? Homework Equations (32m)^2+(58m)^2=c^2 The Attempt at a Solution (32m)^2+(58m)^2=c^2 1024+3364=c^2 √ 4388m^2= √c^2 c=66.24 m...
  6. J

    Calculate Displacement Current from Electric Flux Density

    Homework Statement If electric flux density (D) is given by the vector (xy,yz,xz) then calculate the displacement current density Homework Equations Jd = dD/dt The Attempt at a Solution if you differentiate D, in terms of t, then you just get 0..but that apparently isn't the answer
  7. S

    Find Displacement/ Velocity/ Acceleration of clock

    A clock has a 20cm minute hand. From the 6PM mark to the 10PM mark, for the tip of the minute hand, calculate: a) the displacement vector in unit-vector notation b) the average velocity vector in unit-vector notation c) the average acceleration vector in unit-vector notation d) calculate the...
  8. B

    Displacement of a diving dolphin

    Homework Statement a dolphin swims near the sea surface 350m west, then 200m northwest, and then dives below the surface and swims an additional distance in an unknown direction. The final position of the dolphin is 80m directly below the fishing boat located 400m north of the starting point...
  9. MarkFL

    MHB Solve Parameters of Displacement Function - Raja's Question

    Here is the question: I have posted a link there to this topic so the OP can see my work.
  10. U

    [FlexPDE] Not sure if displacement equations are right

    Hi guys, I'm recently using FlexPDE to find the resonant frequencies of a torsional oscillator, but it does not match the analytic solution. It uses a Finite Element Method to find solutions. Is there something wrong with the equations I'm using? C11 = G*(1-nu) C12 = G*nu...
  11. fortifymagicka

    Finding the Displacement Vector from 3 Given Vectors

    My physics teacher has given me a worksheet with several problems involving trigonometry to find a displacement vector from a set of given vectors. Since this is my first year in physics, I feel out of my element and would really appreciate any help or direction given to me on how to go about...
  12. C

    Linear displacement by flexure, spring or ?

    Linear displacement by flexure, spring or ? I'm doing a little project of mine and I have encountered a problem.. The project is basically a motion platform that moves in three directions at very low forces (few mN). I got the first two direction done (X,Y), but the third is giving me...
  13. N

    Forces, displacement, and coordinates of a particle

    Homework Statement Two forces, vector F 1 = (4 i hat bold + 6 j hat bold) N and vector F 2 = (4 i hat bold + 8 j hat bold) N, act on a particle of mass 1.90 kg that is initially at rest at coordinates (+1.95 m, -3.95 m). A) What are the components of the particle's velocity at t = 10.3...
  14. T

    [Motion Problem] When is displacement equal?

    The figure below shows a velocity versus time plot for two objects; they are at the same point at t = 0. Homework Statement Do the objects ever have the same displacement? If so, when does that happen? Homework Equations Δd = ((velocityi+ velocityf) / 2) Δt acceleration = change...
  15. M

    Help With finding displacement in uniform acceleration

    Homework Statement A subway train starting from rest leaves a station with a constant acceleration. At the end of 7.8 s, it is moving at 11.778 m/s. What is the train’s displacement in the first 5.6394 s of motion? Answer in units of m Homework Equations a= velocity final - velocity...
  16. karush

    MHB IBV10 using displacement vectors

    https://www.physicsforums.com/attachments/1341 for (i) just did 16^2+12^2=400 so \sqrt{400} = 20 km but don't know how they got the 13 \frac{km}{min} there are some more ? on this involving the displacement vectors but want to get this (a) part done first.
  17. G

    Finding Final Velocity & Displacement

    Homework Statement A man shoots an arrow 145m/s at 61o from a height of 15m where the ground below is the origin. A.) Where will the arrow be in 1.5 seconds (X,Y)? B.) What will be the displacement when the arrow lands in regards to where it was shot from Homework Equations I...
  18. D

    Effect of speed on horizontal displacement in projectile motion

    Homework Statement Question: Provided all else is equal, if a ball is thrown at half the original speed will it travel half as far? Homework Equations Δx = vΔt The Attempt at a Solution In projectile motion, the time of flight will be the same no matter the horizontal...
  19. M

    Trying to find displacement using velocity and acceleration

    Homework Statement A train traveling at a velocity of 60.0 m/s is slowed down at a uniform rate of 1.25 m/s2. How far will it travel before its velocity is 1/2 its original value? Homework Equations v2 = vo2 + 2ad The Attempt at a Solution I first need to isolate my variable, so...
  20. F

    Initial velocity required for a certain displacement

    Apologies, this is most likely basic to most of you, and there are probably much better ways to go at this than I have. Homework Statement An 8mm wide cone of a hypothetical substance which does not melt, with a mass of 2.7 grams, is shot straight up at a 90 degree angle. Only accounting...
  21. P

    Displacement as Function of Time Graph Question

    Homework Statement The graph below shows the vertical displacement of an object as a function of time. (a) Construct a graph of the object’s velocity as a function of time. (b) Construct a graph of the object’s acceleration as a function of time. (c) Describe a scenario in which a...
  22. C

    Resultant displacement of vectors

    Homework Statement Find the resultant displacement(magnitude and direction of the following vectors: 12.3m North, 45.6m East, 78.9m West, 14.7m South Homework Equations c=sqrt a^2 + b^2 The Attempt at a Solution Do you just add the vectors so the north and south added together...
  23. H

    Barrel cam design, Torsion, Rotational Speed, Displacement

    Hello I'm a student and I have project making a harvesting tool which need barrel cam I need force to cut trunk of coconut tree (I don't know it in english, what I mean is the hard part of coconut leaf) I'm a bit confuse here from Robert L Norton book Cam Design and Manufacturing...
  24. karush

    MHB Why Do Vehicles Moving North-South Have East-West Velocity Components?

    https://www.physicsforums.com/attachments/1222 there are 5 more questions on this which are more complicated but want to get this (a) first. assume by speed they mean magnitude of the vector. Toyundai speed is 30 \frac{km}{h} Chryssalt speed is \approx 39 \frac{km}{h}
  25. O

    Calculating Displacement from a Velocity-Time Graph

    Hey guys, so I'm having some trouble, not sure if back of the book is wrong or if I'm doing it wrong, probably me though lol. Alright so I have this graph, http://imageshack.us/photo/my-images/27/wqqf.jpg/It's asking me to find displacement at 10.0s. So I know that displacement = area of a...
  26. G

    Displacement on a Position vs. Time Graph

    Homework Statement The graph is of a runner- time(min) is the x position(x1000 m) is the y these are the points 0,0 10,3 20,3.5 30,4.5 The question is- For the time interval between 10 min and 20 min, what is the runner’s displacement? Answer in units of m Homework...
  27. G

    Kinematics displacement question

    a man moves in an open field such that after moving 10 m on a straight line he makes a sharp turn of 60 degree to his left .the total displacement after 8 such turns is equal to
  28. D

    Hp vs rpm to displacement vs time graph?

    Hello, I am a high school student trying to compare two motorcycles on a displacement vs time graph. The information I have is the mass of riders, mass of bikes, gear ratios, tyre circumference and dyno results indicating hp vs rpm. I am not taking air/rolling resistance into consideration...
  29. H

    Nonzero net force involving no displacement. Is this accurate?

    So I am studying mechanical engineering, and I got into a debate with my (mit mechy) graduate roommate about the possibility of having a net nonzero force which involved no actual displacement of an object. Normally, when an object is accelerated along a direction (given an external force)...
  30. C

    Displacement Current understanding

    Homework Statement I am having trouble grasping why exactly displacement current and conduction current are sometimes equal to each other and sometimes are not. My textbook states that the displacement current is defined as ε0 * d(EA)/dt. That is, epsilon not times change in electric flux. I...
  31. G

    Proximal/distal displacement of stents

    What are proximal/distal displacements of stents and what is causing it?
  32. A

    Is max sound intensity at the displacement node in a standing wave?

    Good afternoon all My question is, when we observe stationary waves, and we know that at a certain point, the sound is maximum, is this the displacement node or the displacement antinode? I have read a few different sources and currently i have encountered both. To me it makes more sense...
  33. D

    Find acceleration given initial and final velocity, and displacement

    [b]1. An electron in the cathode ray tube of a television set enters a region where it accelerates uniformly from a speed of 62300 m/s to a speed of 3.86 × 106 m/s in a distance of 3.17 cm. What is its acceleration? [b]2. a = [Vf2 - Vi2] / [2d] [b]3. a = [(3.86 × 106)m/s2 - 62300m/s2]...
  34. A

    Calculating Angular Displacement of CD with Radius 6.0 cm

    Homework Statement If the radius of theCD below is 6.0cm and the angular velocity is 5.0 rad/s , what's is its angular displacement in 2.0s ? Homework Equations Delta θ = ωt+.5∂t^2 The Attempt at a Solution I know the angular velocity and the time but how can I find out the radial...
  35. E

    Faraday's Displacement Flux Experiment

    Faraday's Displacement Flux Experiment: Hi, I am having trouble understanding the experiment...
  36. T

    Displacement derived from Acceleration

    Hello all I was wondering if someone could help shed some light on a physics problem that I am having difficultly with. I am trying to find displacement of a moving object. The only data I have is acceleration (ms/^2) and time (seconds). The acceleration of the object was measured once...
  37. S

    Find components of initial velocity given V & H displacement

    Homework Statement (this is translated from Italian so it might have some technical mistakes :) ) A target with negligible dimensions is placed at H = 5m from the ground; a vehicle on the ground is moving at a velocity V = 2m/s (the module) and is getting closer to the target. Consider O the...
  38. STEMucator

    Calculate frank's distance and displacement.

    Homework Statement Frank drives a load of tomatoes 14 km [E], 6 km [N], 12 km [N 15° E] ( East 15 degrees of north ) and then 2 km [N 65° E]. The trip takes 42 minutes. a) Calculate frank's distance and displacement. b) Calculate frank's average speed and average velocity. Homework Equations...
  39. B

    What is the proof that periods cancel out in finding angular displacement?

    Homework Statement http://answers.yahoo.com/question/index?qid=20120411050123AA0ar9P Homework Equations [b]3. The Attempt at a Solution [/b Only I have one question concerning the answer that "E" provides in the link: why do periods cancel out?
  40. H

    Calculate displacement [Two Dimensional Kinematics]

    Homework Statement A skidding car starts moving with a velocity of 6.75m/s at an angle of 58.82657 degrees north of east. Its velocity just before it comes out of its skid 4 seconds later is 3.25 m/s at an angle of 49.6091 degrees south of east. It travels with a constant acceleration while it...
  41. L

    Spacetime displacement operator in QFT

    I'm trying to fit together my understanding of quantum mechanics, quantum field theory, given my lacking maths education. In quantum mechanics we have a time displacement operator and a space displacement operator, which are respectively: \hat{T}(t) = e^{-i\hat{H}t} \hat{D}(\underline{x}) =...
  42. H

    Displacement of box on inclined plane due to spring

    Homework Statement A frictionless, incline plane at 20 degrees has a spring with force constant k=500N/m attached to the bottom, parallel to the inclined plane. A block of mass m=2.5kg is placed on the plane at a distance d =3m from the spring. From this position the block is projected...
  43. R

    Equilibrium and displacement of a Particle

    Homework Statement The springs AB and BC have stiffness k and an unstretched length of l. Determine the displacement d of the cord from the wall when a force F is applied to the cord. See Picture attached. Given: l = 3 m k = 600 N/m F = 200 N Homework Equations Fspring= ks s=...
  44. Z

    What is the displacement of a wave on a string at a given instant of time?

    "This figure is a snapshot graph of the instantaneous velocity of the particles on a string. The wave is moving to the left at 50 cm/s. Draw a snapshot graph of the string's displacement at this instant of time." So it seems to be a quite basic question, where it's pretty much just an...
  45. ikihi

    Net displacement problem with two triangles

    Homework Statement A ball on a porch rolls 60 cm to the porch's edge, drops 40 cm, continues rolling on the grass, and eventually stops 80 cm from the porch's edge. What is the magnitude of the ball's net displacement, in centimeters? ball starts rolling here \/ rolls 60cm-> #----------#...
  46. ikihi

    Net displacement with 3 figures

    Homework Statement A ball on a porch rolls 60 cm to the porch's edge, drops 40 cm, continues rolling on the grass, and eventually stops 80 cm from the porch's edge. What is the magnitude of the ball's net displacement, in centimeters? Homework Equations d = a^2 + b^2 The Attempt at a...
  47. J

    Object oscillates such that displacement is x = (.222)sin(314t)

    Homework Statement Object is oscillates such that displacement is x = (.222)sin(314t), where t is in seconds. In one period, the objects moves what distance? Homework Equations What is the relationship between displacement, amplitude and distance? The Attempt at a Solution The...
  48. S

    Displacement of a Pendulum to find Work done by Force

    I'm having trouble with this problem. I did: FTcosθ-mg= 0, solving for FT, getting FT= mg/cosθ. Then, along the x-axis, F-FTsinθ=0, solving for F, getting F= mgtanθ. Not sure how to go about it from here. What is the direction of the displacement?
  49. M

    Another: Simple Displacement Reactions & Balancing Chemical Reactions

    Homework Statement Complete the simple displacement reactions and balance any chemical reactions. Homework Equations Pb + NaCl → __________ + ____________ The Attempt at a Solution Pb + NaCl → PbCl + Na But I don't know which charge of lead to use: Pb2+ or Pb4+ to...
  50. M

    Simple Displacement Reactions & Balancing Chemical Reactions

    Homework Statement Complete the simple displacement reactions and balance any chemical reactions. Homework Equations copper + silver nitrate → __________ + ____________ The Attempt at a Solution Since copper on the periodic table can be Cu2+ or Cu+, my solution was copper + silver...
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