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. W

    Eq. for displacement of current-carrying wire due to magnet

    1. Homework Statement This is for a physics lab I am working on. A flowing current causes the wire to deflect towards the right a certain amount that varies depending on the current strength. I need to derive the equation d=(L/mg)F where -- L is the distance between contact 1 and 2 both of...
  2. gracy

    Why a finite angular displacement is not a vector?

    One of my friend has answered this question in this way. Angular displacement can't be a vector because addition is not commutative. Say we are looking at the Earth with North America facing us and the North Pole facing up:if we rotate the Earth so that we move 90 degrees north, now the NP is...
  3. J

    Finding displacement with acc and vel

    I'm working on a problem involving pulleys and would appreciate help. I know the initial starting positions of both objects (0.3 m above ground) and their initial velocity which is zero. The question wants me to find the maximum height the lighter object can achieve - i.e. its height even after...
  4. N

    What effects the displacement of object from a slingshot

    hey, What would be the things that effect the displacement of an object when fired from a slingshot? I assume that is would be mass, distance the rubber is pulled back, the speed of release for the rubber and the angle. But in what was would they effect the displacement. What are the formulas...
  5. V

    Inverse of wien's displacement

    Could I by any way find out average thermal retention of a blackbody that is irradiated with x rays? Since wavelength is inversely propotional to temp, in order to emit and absorb x rays it must be at a fairly high temperature I guess.
  6. c_pearls

    Classical Mechanics - finding displacement with given force

    Homework Statement - The force acting on a particle m = 3kg is given by the following force equation: F = (v/9)(3 - x2), the particle begins at a position of x = 1m with a speed of v = 0 m/s at time t = 0s. Find the displacement of the particle at time t = 5 s. Homework Equations F =...
  7. R

    What is the maximum height reached by a launched human?

    Homework Statement Hi guys, I am working through a very long problem and I am stuck at this part. So I have a 70kg human being launched at a 90 degree angle at 15mph. I need to figure out how high in the air he will get before velocity reaches zero again and he begins to fall. Homework...
  8. S

    Can force or displacement be negative in the work equation?

    I know that work is the "dot product" of force and displacement, but I got a little stuck with this problem: "Vera is driving her 1000-kg car at a speed of 8m/s. When Vera slams on the brakes, the ground exerts an 8000-N frictional force to bring the car to a stop. Determine the initial kinetic...
  9. W

    Which person exerted a force perpendicular to displacement?

    Homework Statement Jack and Jill are maneuvering a 3570kg boat near a dock. Initially the boat's position is https://s3.lite.msu.edu/adm/jsMath/fonts/cmsy10/alpha/144/char68.png2,0,9https://s3.lite.msu.edu/adm/jsMath/fonts/cmsy10/alpha/144/char69.pngm and its speed is...
  10. A

    Exploring Motion Down a Ramp: Understanding Velocity and Displacement

    The question is `For the same time interval , how did the area beneath the velocity-time graph compare with the displacement of the cart? How should it compare?` I don't understand what they`re asking me to do, please help.
  11. A

    Simple Harmonic Motion, Initial Displacement vs Initial Cond

    Hi everybody, I'm writing an exploration on the mathematics of simple harmonic motion and I stumbled across something I fail to understand in one of my resources (http://tutorial.math.lamar.edu/Classes/DE/Vibrations.aspx). In the example the author uses toward the end of the resource, the...
  12. I

    Converting Chord Length to Radians: A Confusing Concept?

    Homework Statement Coverting Cord length to radians and the other problem is: A ball Radius = 12 CM, rolls 15 M, across the gym floor. Through what angle does the ball rotate? We just started this today and I am very confused by it. the other question is converting 11.6 CM Chord Length into...
  13. J

    Understanding Work, Energy, and Displacement in a Spring System

    Homework Statement In the pictures. Homework Equations KE = 1/2mv^2. PE = 1/2kx^2 Work external = Delta KE + Delta PE W = F* dThe Attempt at a Solution In the pictures.Comments: On Problem 3 ai, I am not sure whether I have identified the correct horizontal forces. The hint gave two, but I...
  14. R

    Boat Positioning: Lorraine and Jeff's Displacement in Race - Homework Question

    Homework Statement Lorraine steered her boat out of the harbor, heading east. She traveled 500 m to one buoy and then turned north and headed 300 m to another buoy. Jeff also left the harbor from the same point, and traveled 300 m [N] to a buoy, and then went 500 m [E]. a) What is the position...
  15. H

    Displacement of deflected puck on ice

    Homework Statement a puck on the ice travels 20.0 m [5.0 degrees E of N], gets deflected, and travels 30.0 m [35.0° N of W]. Determine where the puck will end up with respect to its starting point, e.g., the puck's total displacement Homework Equations c^2=a^2+b^2-2abcosC The Attempt at a...
  16. Ravenalia

    From rotational KE to translational displacement

    Homework Statement A frictionless pulley has the shape of a uniform solid disk of mass 5.00 kg and radius 28.0 cm . A 1.40 kg stone is attached to a very light wire that is wrapped around the rim of the pulley, and the stone is released from rest. As it falls down, the wire unwinds without...
  17. Toon

    Velocity vector displacement problem

    1.)Hey everyone! I am having some trouble with a problem and hoped someone might be able to steer me in the right direction! The problem states , A motorist drives south at 20.0 m/s for 3.00 min, then turns west and travels at 25.0 m/s for 2.00 min, and finally travels northwest at 30.0 m/s for...
  18. C

    Calculating Final Velocity of a Car Using Uniform Acceleration

    Homework Statement A car enters the freeway with a speed of 6.4 m/s and accelerates uniformly for 3.2 km in 3.5 minutes. How fast in m/s is the car moving after this time? Homework Equations DeltaX=1/2(vi+vf)(DeltaT) Displacement=1/2(initial velocity + final velocity)(Time interval) The...
  19. stephenranger

    Will the man catch the bus if he starts 10 meters away from the door?

    Homework Statement A man runs at a speed of 4.0 m/s to catch a standing bus. When his distance to the door is 6.0 m, the bus starts moving forward and continues with a constant acceleration of 1.2 m/s2. 1. How many seconds does it take for the man to reach the door ? 2. If at the beginning he...
  20. Archit

    Help me calculate the speed of the basketball

    Here is the picture for you to understand it better. Please help me calculate the velocity required for the ball. I have already tried it with the formula: displacement = initial velocity(time) + (acceleration)(time2)/2 but cannot since I do not know the initial velocity and the time Please...
  21. P

    Finding displacement of the string given a function

    Homework Statement The shape of the wave on the string at t=0 is: y=(2x)/(x^2+50) The waveform is moving in the +x direction at a propagating speed of 10cm/s. Find the displacement of the string in cm when t=5s and x=30cm Homework Equations ∂^(2)y/∂x^(2)=(1/v^2)*∂^(2)y/∂t^(2)[/B] The Attempt...
  22. M

    Instantaneous Displacement of a Sound Wave

    Homework Statement A sinusoidal sound wave moves through a medium and is described by the displacement wave function s(x,t) = 2.00cos(15.7x - 858t) where s is in micrometers, x is in meters, and t is in seconds. Find a) the amplitude, b) the wavelength, and c) the speed of this wave. D)...
  23. A

    Displacement Current: Difference & Example

    Is displacement current always equals to conduction current?if not then can anyone give me an example for it?if yes,then can anyone prove it?
  24. B

    Closed-space sphere "displacement"?

    This is strictly a geometric question from Lemaitre's writing. He is presenting an example of a closed space represented as a sphere (I'm assuming the surface only?), and makes a "displacement" of the sphere to demonstrate a point. I am not following his operation on the sphere based on any of...
  25. G

    Push Rod Suspension Geometry Question Camber Change Wheels

    Hey, I've spent ages trying to solve what seems to be a pretty simple geometrical problem and I was wondering if anyone could help me solve it/give me some tips. I am trying to model how the suspension of a car behaves as a result of a displacement of the wheels. What the attachment shows is a...
  26. R

    Help with deriving time, velocity, displacement

    Homework Statement A dog accelerates from 2.0 m/sec to 5.0 m/sec while covering a distance of 14.0 m. How long did this take Homework Equations d=(Vi+Vf/2)t The Attempt at a Solution 2(-Vi-Vf)d=t I am doing something wrong. Please help. Thanks[/B]
  27. K

    Resistance of Displacement Current

    I guess i have discovered or i may say re-discovered if already existing a formula for the resistance offered to the displacement current in capacitors. I am not talking about the capacitive reactance but, a resistance which depends on time, area and further more calculations. What shall i do...
  28. B

    How much weight required to submerge this object?

    Hi all, So A quick question for all the smart minds out there to ponder (plus I'm stumped and need help). I'm helping a friend out with a short film and we are trying to be cost efficient. I need to submerge a 2000L plastic tank (circular and approx 1.5 high) and then release it to make it...
  29. koustav

    Derivation of Wiens Displacement & Distribution Laws from Thermodynamics

    derivation of wiens displacement law and wiens distribution law from thermodynamic principle.but not from Plancks law
  30. D

    Laminar Pipe Flow: Displacement, and Momentum Thicknesses

    Hello. I'm new to the forums. I apologize if I have posted this in the wrong topic area. I'm new to this hydrodynamics area and I'm trying to learn the concepts of boundary layer thicknesses. My question is about laminar pipe flow and calculating displacement and momentum thicknesses. I was...
  31. Q

    Physics Work, Force, Energy problem

    What force did the child exert if he got to the top of the slide by climbing up the 10 meter long side of the slide...
  32. E

    Are Displacement and Deflection the Same in Beam Analysis?

    Hi I am tackling a question which combines Beam deflection with Bending Virtual Load. I am wondering whether the displacement found at a point through complementary energy (virtual load) is the same an the deflection through beam integration at that same point? It maybe a stupid question but...
  33. E

    How to Calculate Average Velocity with Displacement & Speed?

    Homework Statement A car travels 14.6 km west at a speed of 40 km/h, then travels 12.0 km south at a speed of 50 km/h and finally travels 19.0 km east at a speed of 45 km/h. What is the magnitude of the average velocity for the car over the entire trip? Homework Equations 3 kinematics...
  34. naima

    Can the Displacement Operator Rotate a Photonic State in Phase Space?

    Hi PF I read the definition of the displacement operator: ##D(\lambda) = e^{\lambda a^\dagger - \lambda ^* a}## but i did not find how this operator can be implemented say in a cavity with a photonic state inside. Could you give me links? thanks.
  35. R

    Finding Initial Speed given Kinetic Friction, Mass, and more

    Hi, I'm new here and I'm having trouble with a question. 1. Homework Statement A 20.0-kg curling stone is released at the hog line and moves 28.35 m [W] to sit on the button and score a point. If the coefficient of kinetic friction between the stone and the ice is 0.00200, what was the...
  36. H

    Do Vector Components Represent Displacement?

    I'm just starting to learn about vectors, and I was trying to figure out what the vector components mean physically. I've seen two definitions of vectors, and the first is a that a vector is something with a size and a direction. The second definition I saw defined vectors as "displacements in...
  37. T

    Energy & Spring Displacement function

    Homework Statement What would be the energy required to stretch a spring of \vec{F}spring = - (ax+βx^2)\hat{x} where\vec{x} = x*\hat{x} Homework Equations [/B] \vec{A}/|A| = \hat{A} |\vec{A}| = sqrt(A*A) A = (A^x)^2 + (A^y)^2The Attempt at a Solution [/B] So far I'm at a loss just getting...
  38. A

    Find how far apart are the particles from each other

    Homework Statement Two particles oscillate in simple harmonic motion with amplitude A, about the centre of a common straight line of length 2A. Each particle has a period of 3.3 s, and their phase constants differ by π/9 rad. (Assume the lagging particle starts at +A. Also assume that the...
  39. T

    Kinetic Energy and Displacement of a 2 piece system

    Homework Statement You stand at rest on one end of a 3.00m long platform (also at rest). The platform is on a smooth friction-less surface. If you walk from one end of the platform to the other at the constant rate of 2.00m/s, what is the kinetic energy of the system (you and the platform)...
  40. L

    Displacement in Conversation of Energy on Incline vs Projectile

    How come when I do a conservation of energy up an incline the displacement is the distance up the incline, but when I do a conservation of energy from a projectile the displacement is not the resultant of the x and y displacements (instead, it's only the displacement in the y-direction)? Thank-you
  41. W

    Acceleration as a function of displacement

    In one my classes my lecturer showed us the following derivation of acceleration as a function of displacement dv/dt = v(dv/dx) = d(.5v^2)/dx I understand how to get from the first to the second part. But I'm not sure how he got from the second part to the third. Its almost like he integrated...
  42. S

    How Do You Calculate RMS Displacement for an Oscillating H2 Molecule?

    Homework Statement The question is as stated: "The ##H_2## molecule has oscillatory excitations. In classical physics the energy can be approximated to \begin{equation} E = \frac{p^2}{2m} + \frac{m \omega^2 x^2}{2} \end{equation}where m is the reduced mass. Quantum mechanics can be applied to...
  43. G

    Calculating Stiffness & Displacement of Structure w/100kN Weight

    Homework Statement 1. A structure with weight of 100 kN and which has a natural period of 1 second. Compute the stiffness of the structure. The structure has 5% critical damping. The structure when at rest is subjected to a half sine wave loading having a magnitude of 10kN and lasting 2...
  44. C

    Calculating Minimum Energy for Gamma-Ray Displacement of Carbon Atoms

    Hi everyone, For one of my PhD project I am trying to calculate the minimum energy required to displace a carbon atoms with gamma rays. Knowing the displacement energy (Ed) for C in diamond (30 -40 eV), I've managed to calculate the minimum energy required using electron with the formula...
  45. M

    Equation of motion for a massless spring system

    Homework Statement Homework Equations f_spring = k(x_near - x_far) The Attempt at a Solution a. FBD: The force goes through the nodes, and the sum of the forces must be 0 because the nodes are massless. Therefore, kx_1 = x(t) So x_1(t) = x(t)/k b. FBD: For this system, the parallel...
  46. M

    Rotational motion: Find angular displacement when rotation speed is changing

    Homework Statement A torque acts on a wheel rotating at 19.8 rad/s and increases its angular speed to 23.5 rad/s in 11.2 s. Find the angle through which the wheel turns during this time. Homework Equations omega = theta/time The Attempt at a Solution 23.5 - 19.8/11.2 = .33rad/s/s --- this is...
  47. M

    [Grade 12 Physics] Vector addition/Mechanics

    Homework Statement "An electron moves at 24.8m/s (N37.5E) and undergoes a constant 103m/s2 (E37.5S) acceleration for 3.02s what is the displacement? Homework Equations 0.5at^2 = d d= vt The Attempt at a Solution I calculated the displacements to be 74.896m (N37.5E) and 469.7006m (E37.5S)...
  48. Hijaz Aslam

    Cartesian Convention of Displacement Vectors.

    Homework Statement Q.[/B] A body dropped from a height H above the ground strikes an inclined plane at a height h above the ground. As a result of the impact, the velocity of the body becomes horizontal. The body will take the maximum time to reach the ground if : (a) ##h=\frac H4## (b)...
  49. Hijaz Aslam

    Defining a displacement vector not touching the origin

    In the diagram let the magnitude of the vector BC and OA are 'x'. I am confused with this part. Vectorially we don't say that the vector BC is ##-x##, because ##-x## is represented by OA. Then how do we represent BC? It's said a the position of a vector doesn't matter, I mean one can shift it...
  50. H

    W=F.dx rate of change of x approaches to zero?

    In the integration of Force with respect to displacement (W=∫F.dx), is that true if the rate of change of displacement approaches to zero? My teacher said the one which approaches to zero is the rate of change of time. But If I arrange the formula, I will get F=dW/dx then F= lim Δx→0 ΔW/Δx...
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