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. A

    Angular Velocity in Simple Harmonic Motion

    I am very confused about angular velocity ω and why its used in simple harmonic motion. ω is described as θ/τ but when it comes to masses on springs, there is no angle - it is zero. Angular velocity comes from circular motion but the motion of SHM is not circular. My confusion is even greater...
  2. I

    What is the total displacement?

    Homework Statement So there are two rhinos chasing each other back and forth, Asha and her dad. What is Asha's total displacement at each point in increasing order(least to greatest)?[/B] Asha's velocity is represented by II and her position at A:30, B:25, C:22, D:25, E:37. Homework...
  3. H

    Displacement of Center of Mass Problem

    1. The problem statement, all variables, and given/known data A square of side 2 L is removed from one corner of a square sandwich that has sides of length L. The center of mass of the remainder of the sandwich moves from C to C’. The displacement of the y coordinate of the center of mass (from...
  4. Q

    Electrical displacement: doubts

    Hi. Maybe you can help me. I am reading history of physics, especially the moment when Maxwell completes Ampere's law with the displacement current. My doubts are about propagation in a vacuum. 1. Can I say that in an electromagnetic wave there are several undulating fields, one of them the...
  5. T

    Understanding Gauss' law: diff b/w E and D flux?

    I noticed the other day something odd in how we use Electric and Magnetic flux. The definitions I refer to are magnetic flux density (B), magnetic flux intensity (H), electric displacement field (D) or Electric field density (D) and electric field (E): B = μH ΦB = B*Area & D = εE ΦE = E*Area...
  6. S

    What are the Best Methods for Precise Vertical Movement Measurement?

    I want to test the accuracy a linear displacement sensor (Hall effect) that I have, but I'm not sure what to measure it against. The sensors are made to measure with a resolution of 10μm. My initial thought was to use a drill press to move up and down, but I don't think I know of any that are...
  7. T

    A Difference between virtual displacement and differential?

    What exactly is the difference between a virtual displacement and a differential displacement? It seems like they are really the same thing if by differential we assume we are talking about a distance whose magnitude approaches zero.
  8. patrykh18

    ∆KE if angle between force and displacement varies

    Homework Statement A string is attached to a block that can slide along a frictionless horizontal surface aligned along the x axis. The left end of the string is pulled over a pulley of negligible mass and friction at a height of 1.3m so that the block slides from x1=3m to x2=1m. The tension...
  9. L

    Acceleration, Displacement, Graph Interpretation

    Hello, I was working on a worksheet. It gave a graph that was velocity vs. time. I was asked to find the acceleration rate for the given (specific) time in seconds. My first question is if the line on the graph for example is from 1-3 seconds, in that 1-3 second range, is acceleration constant...
  10. L

    Finding Displacement based on Velocity Graph

    Homework Statement A goalie moves in a straight line and her velocity is described by the graph shown. How far away is the goalie at the time t=2.0 from where she was at t =0? The description of the velocity/time graph: initial velocity is 3.0 m/s and increases to 4.0 m/s in 1.2 seconds (slope...
  11. H

    Fluid Statics- u-tube displacement

    Homework Statement A uniform U-tube is partially filled with water (ρH20 = 1000 kg/m3). Oil, of density 750 kg/m3, is poured into the right arm until the water level in the left arm rises 30 mm. The length of the oil column is then: (Answer: 40mm) Homework Equations P = pgh Pressure = density...
  12. S

    Find angle between displacement and velocity vector

    Homework Statement A stone is thrown at 25m/s and at 37 degrees above the horizontal from a 20m high building. Take g=10m/s2 Let D be the displacement vector from launch point on top of the building to landing point on the ground, and v be the velocity vector on impact, what is the angle...
  13. M

    What is the angle and displacement of the plane?

    Homework Statement In the figure below, a radar station detects an airplane approaching directly from the east. At first observation, the range to the plane is d1 = 412 m at 40° above the horizon. The airplane is tracked for another 123° in the vertical east–west plane, the range at final...
  14. NihalRi

    Damped oscillation and time between displacement maximums

    Homework Statement [/B] Question 3.9 Homework Equations equation for dampened ocillation[/B] The Attempt at a Solution In case this might appear confusing, I derived(with respect to t) the equation for dampened oscillation given above and tried to solve for when it equaled zero expecting...
  15. Bill_Nye_Fan

    A Force Depending on Velocity and Displacement

    Homework Statement A body of mass 1 kg moves so that at time ##t## seconds, its displacement is ##x## meters from a fixed origin. The body is acted upon by a force of ##\frac{\sqrt{x-1}}{v^2}## Newtons, where ##v## is the velocity in m/s. The body is initially at rest 1 meter North of the...
  16. A

    I Controversy about the nature of finite angular displacement

    Hello all, I am having hard time to know if the finite angular displacement really a scalar quantity? In some books they say angular displacement when finite is Scalar and when infinitesimal small is Vector, with direction perpendicular to plane of circle government by right hand rule. I...
  17. W

    Simple pendulum - displacement increase

    <Moderator's note: Moved from a technical forum and therefore no template.> A simple pendulum of length l (supported by a light, rigid rod) is released from rest at a small angle to the upward vertical. Show that the time taken for the angular displacement to increase by a factor of 10 is...
  18. E

    Finding the maximum displacement

    Homework Statement I want to find the maximum displacement of block A in the left direction Homework EquationsThe Attempt at a Solution I first found the velocities of both blocks after the bullet escapes with 100m/s by using the impulse-momentum theorem. I then applied the work-energy...
  19. C

    Overall displacement vector from a walking trip....

    Homework Statement I start walking. The first leg of my trip I walk 65 meters at 5 degrees south of east. The second leg of my trip I walk 75 meters at 18 degrees north of east. The final leg of my trip I walk 95 meters at 69.5 degrees north of west. Choose the coordinate system so that x is...
  20. J

    Plotting graph for acceleration against displacement

    A mass of 0.3 kg is suspended from a spring of stiffness 200 N m–1. If the mass is displaced by 10 mm from its equilibrium position and released, for the resulting vibration:Plot a graph of acceleration against displacement (x) (for values of x from x = –10 mm to x = +10 mm) Hugely struggling...
  21. S

    What was Martha’s displacement before turning around?

    Homework Statement Use the following information to construct any necessary graphs to help you complete the next four questions. Martha leaves her house and drives with a constant velocity due east at 15 m/s for 85 seconds. She realizes she forgot something at home and stops the car in 6.5...
  22. S

    Calculate the time at which the object changes direction

    Homework Statement An object starts from rest and uniformly acquires a velocity of 20.0 m/s in 5.0 minutes. For the next 10. minutes the object moves with a constant speed. After 10. minutes moving at 20. m/s the object then again accelerates and reaches a speed of 15 m/s in the opposite...
  23. Jason Louison

    Automotive Understanding CSM Displacement with Offset

    So I know that the relationship between the crank throw and the stroke of a non-offset CSM is S=2R. But then I realized that when offset is introduced, the stroke length changes just a little. So I spend some time drawing diagrams and then found out that the maximum piston position for any CSM...
  24. R

    Displacement from Acceleration/Time graph

    Homework Statement Homework Equations I know that I probably need to use s=vit+1/2at2, however, I'm having trouble properly applying it The Attempt at a Solution I know that part A is 20m/s and then 5m/s. I know this is an easy problem and I'm actually 2 chapters ahead. For some reason, I...
  25. Kiwigami

    Understanding Drag Force against a non-linear Force

    Homework Statement I'd like to understand Drag Force better; but school always ignores it. Thus, I'm asking this purely out of obssession. I'm picturing a scenario where a non-constant force is pushing an object horizontally, ignoring friction. But, I'd like to understand how Drag Force...
  26. Kiwigami

    Find time given a force with respect to displacement

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  27. T

    Displacement current in coaxial cables

    To calculate the displacement current in a coaxial cable (with equal and opposite currents on the inner and outer conductors), most standard texts use the magnetoquasistatic approximation, which ignores the time-varying electric field term in Ampere’s Law. Using this approximation, the...
  28. E

    Calculating displacement and energy in a structure

    Homework Statement The problem is, calculate the energy and displacement of the structure. What is the displacement (y) in the middle of the beam? See drawing and variables in attached PDF file. Homework Equations See PDF file. Important: To form the moment function M(x), I use delta...
  29. EastWindBreaks

    Relative Displacement Homework: Clarifying Answers

    Homework Statement Homework EquationsThe Attempt at a Solution I am a little confused by the wording of the textbook solution. from the solution, the displacement at the end C of the rod = the displacement of C relative to the fixed end A, why not the displacement of C relative to the fixed...
  30. A

    Calculating distance from acceleration as function of speed

    I'm trying to calculate the displacement d of a plane as it accelerates towards lift-off velocity. The acceleration is given by the function a = a0 - kv2 where a0 is the constant acceleration from the plane's engine and the term -kv2 is caused by air resistance. I can't seem to find a way to...
  31. KeiaYamada

    B Bouyancy: mass and displacement

    This is something I've always wondered and I have never taught about this at school so I leave a thread on this forum. I know that displacement = the mass of the object, but I don't quite get this concept. For example, if you have a kilogram of gold and a kilogram of iron and put them in...
  32. StudentOfScience

    Displacement Function of an Idealized Circular Loop Coaster

    Homework Statement Suppose we have a roller coaster cart of mass m, which may be approximated as a point mass for our purposes. Ignoring friction and air-drag, what is the displacement of the cart as a function of time? It enters the loop with an initial velocity $$ v_0 \hat i $$ and the radius...
  33. E

    Find maximum acceleration given the displacement equation

    Homework Statement Given: x=9sin2t +16cos2t+100 The problem asks me for the maximum acceleration and the maximum velocity. Homework Equations dx/dt=v dv/dt=a The Attempt at a Solution The problem asks me for the maximum acceleration and the maximum velocity. To find the maximum velocity, i...
  34. Jewelz

    Non-Constant Acceleration Problem

    Homework Statement A new Tesla is designed that can perform a non-constant acceleration for 10 seconds of motion. The magnitude of the acceleration is given as a(t) = 1 m/s4t2 Starting from rest, how far does the car travel over this 10 second interval? Homework Equations This is what is...
  35. F

    Displacement in external redundant truss

    Homework Statement In this question , the author doesn't stated which direction ( either horozintal support of the pinned E or the vertical support force at pinned E to be selected as redundant ) . So , I tried this problem by applying the vertical force support at E as redundant .Homework...
  36. I

    Vector differential displacement - Magnetic vector potential

    Homework Statement http://imgur.com/a/k7fwG Find the vector magnetic potential at point P1. Homework Equations Vector magnetic potential given by: $$ d \bar{A} = \frac{\mu I d\bar{l'}}{4 \pi | \bar{r} - \bar{r'} | } $$ The Attempt at a Solution I split up the problem in 3 parts, first...
  37. binbagsss

    Is This the Correct Approach to Derive Wien's Displacement Law?

    Homework Statement I have ##E(w)=w^3(e^{\beta\bar{h}w}-1)^{-1}##, where ##\beta=K_{B}T##, ##K_{B}## boltzman constantHomework Equations Need to solve ##\frac{dE(w)}{dw}=0## The Attempt at a Solution [/B] ##k=\beta\bar{h}##...
  38. Y

    Is a position time graph and a displacement time graph the same?

    Please tell ?
  39. L

    Acceleration & max displacement from velocity equation

    Homework Statement The velocity of an object moving along the x-axis is given by Vx = (2.0t-t2)m/s. Initially (at t=0), the object was at the origin. a) Determine the object's acceleration at t=3.0s. b) Find the object's position at t=3.0s c) Calculate the object's maximum positive...
  40. R

    A ball is hit with initial velocity -- Find the Horiz/Vert displacement

    Homework Statement A softball is hit with an initial velocity of 29 m/s. at an angle of 60 degrees above the horizontal and impacts the top of the outfield fence 5s later. Assuming the initial height of the softball was .5 m above (level) ground, what are the balls horizontal and vertical...
  41. Peter Andrews

    Finding displacement current in an AC capacitor circuit

    Homework Statement A capacitor is made of two parallel plates of area A, separation d. It is being charged by an AC source. Show that the displacement current inside the capacitor is the same as the conduction current. Homework Equations Idisp = ε(dΦE/dt) Q = CV C = Aε/d Xc = 1/(2πƒC) Q(t)...
  42. Guidestone

    Why Does Pulley and Spring Setup Result in 2(x1+x2) Displacement?

    Hey guys, I'm wondering why the displacement of the mass mounted in this setup is 2(x1+x2)?. I'm assuming that when the pulley rotates(when the mass is pulled downwards) the distance between the initial point and the end point of its center and the distance traveled by the mass are equal...
  43. T

    Flux and Induced EMF vs displacement graphs

    Homework Statement A small coil of wire is situated in a non-uniform magnetic field. The coil consists of 40 turns of wire and moves with a constant speed in a straight line. The coil has displacement x from a fixed point P. The variation with x of the magnetic flux in the coil is shown in the...
  44. physics_student16

    B How to label displacement through time

    I was wonder what units you would use to measure your motion through time?
  45. M

    Displacement of the node, superposition of forces

    Homework Statement Hi, I was wondering if anybody has an idea how to divide the forces on this structure to get the dispacement of the node 4. 2. Formulas I would like to solve this task by superpositioning forces working on different elements of the construction. (note different EI) using...
  46. javii

    Net displacement of a particle given its equation of motion

    Homework Statement Hello PF, I need some help with the assignment given: v=18-2t^2 m/s, where t is in second. When t= 0 the position of the particle is s_0 = - 3 m. For the first 5 seconds. Determine the total distance ( i got it to 65,33 ft) and the net displacement Δs, and the value of s at...
  47. F

    Why does the author use Δ1 + Δ2 for C instead of just Δ2?

    Homework Statement I know that when the 80kN act on B , the frame will be dispalced by Δ1 to the right .. When the 40kN act on C , the frame will be displaced Δ2 to the right ... Why the author use Δ1 + Δ2 for C ? Homework EquationsThe Attempt at a Solution Is the author wrong ? I think the...
  48. R

    Simple harmonic motion displacement equation confusion

    Okay, so I have just started with simple harmonic motion(SHM). So the equation of displacement in my textbook is given as: X= ACos(wt +x) where A is the amplitude X is displacememt from mean position at time t w is angular frequency x is phase constant...
  49. A

    Vectors: Displacement, average velocity & speed

    Homework Statement A plane flies 413 km east from city A to city B in 49.0 min and then 814 km south from city B to city C in 1.70 h. For the total trip, what are the (a) magnitude and (b) direction of the plane's displacement, the (c) magnitude and (d) direction of its average velocity, and...
  50. F

    Finding displacement at a point in truss

    Homework Statement For the circled part , how to get the +1.33 , -1.67 , +1 ? What are they ? Are they the µ ? Homework EquationsThe Attempt at a Solution What is µ ? How to get the value ? It's not stated in my book though
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