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. N

    Help with displacement and velocity of waves on a string (using trig)

    Hello all, excited to be on the forums. I'm having trouble solving a problem from one of my past exams (prepping for final). Could you please guide me? The displacement associated with a wave on a string has the functional form y = 0.2 cos (10x - 4t). What is the wave speed? The answer...
  2. A

    Simple Harmonic Motion - whats the displacement of the mass

    Homework Statement A mass on a spring obeys SHM.Given that the mass is initially at the equilibrium position,has an initial velocity of 2m/s,and a nastural frequency of 2 rad/s,Find A and φ After 13.2 sec what's the displacement of the mass Homework Equations ψ=Αcos(ωt+φ) The Attempt...
  3. R

    Finding Displacement Amplitude of a Pressure Wave

    Homework Statement A traveling sound wave causes a variation in air pressure according to the equation: ∆P = 20.0 sin(15.5x − 5.32 × 103t ) where x is in metres, t in seconds and pressure is in pascals. What is the amplitude of the displacement of the air particles caused by this...
  4. J

    Explaining the relationship between launch angle and displacement

    Moderator's note: two threads merged into one. -- Redbelly98 Homework Statement what is the relationship between the launch angle and the displacement of a projectile, is it possible to say that the launch angle is proportional to displacement, can it be done mthematically by using...
  5. Z

    How is lateral displacement (reflection/refraction) derived?

    my book is only introductory and they only gave me the equation S = t*sin( theta1 -theta2)/cos(theta2), i like to know how its derived so i can better understand and memorize this... i know i can probably work this out myself but i don't know where to start i am assuming it has something to...
  6. Z

    Displacement and Velocity using Integration.-

    Homework Statement My question is really regarding a shortcut. I never did displacement/distance and velocity with integrals in Calculus 1 and it's time for review. The professor offers a way to find the two new definite integrals in distance traveled by creating an elaborate diagram with a...
  7. L

    Embarassing question- Displacement equation

    Embarassing question-- Displacement equation Homework Statement Im just trying to understand why the equation for displacement along a line is x= 1/2(v_{0}+v)t. If the other equation for displacement is v*t, where does the 1/2 come from? Homework Equations v*t x= 1/2(v_{0}+v)t...
  8. S

    Heisenberg Uncertainty Relations - angular momentum and angular displacement

    Homework Statement Starting from one of the more familiar Heisenberg Uncertainty Relations, derive the Uncertainty Relation involving angular momentum and angular displacement and explain its significance. Homework Equations The relevant uncertainty relationship is that between...
  9. D

    Probability of Displacement for Linear Harmonic Oscillators

    Homework Statement Assume, you have an ensemble of linear harmonic oscilators, all having the same frequency \omega and amplitude a: x = a\cos(\omega t + \phi). The phase \phi is uniformly distributed in the inteval [0,2\pi). What ist the probability w(x)dx to find the displacement of one...
  10. Y

    Acceleration in terms of displacement

    Homework Statement a)find the velocity when x = 3, b)find the time taken to travel between x=1 to x=3. when x = 1, v = 0 Homework Equations a=2x The Attempt at a Solution a)using the chain rule I got v = 2x^2 + u (u as a constant), but I think that's wrong. i tried using...
  11. G

    Calculating Yield Strength using a Load vs. Displacement Curve

    Hi, This question came up on my midterm and I had no idea how to answer it without redrawing the entire curve as a stress vs. strain curve (which obviously took too long to do). Anyway, I'm just requesting a general procedure, not a numerical answer. If you had a Load (y-axis) vs...
  12. G

    Solving Displacement of Mass on Spring at v=1m/s

    Homework Statement A 0.10kg mass is on a spring with k = 0.10 N/m. At time t=0s it crosses x=0m with a velocity of 2.0m/s. What is its displacement when v=1.0m/s? Homework Equations x(t) = Acos(wt + \varphi) v(t) = -wAsin(wt + \varphi) w = \sqrt{k/m} The Attempt at a Solution...
  13. D

    Displacement of water for a boat and raft

    If you have a perfectly flat, rectangular raft and a perfectly flat, rectangular boat, which will displace more water? Or will the water displacement be the same. I remember that the water displacement is dependent on the shape of the floating object and the weight, but I can't remember exactly...
  14. C

    Efficiently Calculate Stopping Time for a Cyclist | Displacement Homework

    Homework Statement A cyclist is traveling with a speed of 11.0 m/s when she applies the brakes. After slowing for 2.5s, her speed has been reduced to 3.0 m/s. If she continues braking, how much longer will it take her to stop? I found the deceleration to be -3.2 m/s^2 V1 = 3.0 m/s V2 = 0...
  15. L

    Interpolation of data on Excel for analysis of Load Displacement

    I don't need any help for the engineering maths I'll be doing after but if I anyone could advise me on how to write a program that would take a set of x and y values and then give me back the y values at certain intervals on the x-axis I would be very grateful. I've got colossal amounts of data...
  16. J

    MATLAB MATLAB code (calculating displacement)

    Hey guys, I need help. Say i take a picture of a dot in a frame followed by another picture whereby the dot has moved to another spot in the frame. How do I calculate the distance between these 2 dots? At the end, i would have 2 jpeg images of the dot at 2 different locations. What I'm trying...
  17. N

    Deriving the displacement equation for a sinusoidal wave

    Hi everyone, I'm trying to understand the derivation of D(x,t) = A \sin{(kx - \omega t + \phi_o)} which is the displacement equation for a sinusoidal wave. The way my textbook (Physics for scientists and engineers by Knight) does it: Look at the graph of displacement versus position at time...
  18. M

    What is the displacement covered by the man and bouncing ball?

    Hello there , http://www.zshare.net/image/73581857700fb471/ If I am asked about the displacement covered by the man in this case , so should I write the vertical distance covered by the man (15 m) or the horizontal one (30 m) ??or they both work?? And why?? My question is the same for a...
  19. C

    Displacement, Elapsed Time, Magnitude, Direction, and Average Speed on a Trip.

    Homework Statement A group of physics students take off in a small plane to visit physics Land. The plan flies at a constant speed of 160 mph. They start at Newtonville and travel 160 miles due north to Faraday Town. At this point they change course for Maxwell City, which is 320 miles away...
  20. C

    Object Displacement from one point in space to another.

    Homework Statement An object goes from one point in space to another. After it arrives at its destination, its displacement is _________________ than the distance it traveled. A) either greater than or equal to B) always greater than C) always equal to D) either smaller than or equal to...
  21. T

    Solve Displacement Problem: 24 Rads

    Homework Statement http://img52.imageshack.us/img52/5412/displacement.jpg The Attempt at a Solution First I calculated the equation for the line using point-slope form. I got y = 3x-9. Then I found angula velocity at 8 seconds, which turned out to be 15 rad/s. Then I drew the complete...
  22. R

    Projectile: Find range, given two displacement points

    Homework Statement A particle is projected with initial velocity u\cos\alpha\vec{i}+u\sin\alpha\vec{j} m/s from a point 0 on a horizontal plane. If this particle passes through two points whose displacements from 0 are 3\vec{i}+\vec{j} and \vec{i}+3\vec{j} show that the range is...
  23. H

    Spring Powered Dragster. Time dependent displacement function

    I am to design a gearbox for a small spring powered dragster. It needs to complete a track of 10 m, so I want the spring to give out it's energy over this distance, but without causing wheel slipping. I also need to produce graphs: acceleration vs time, velocity vs time and distance vs time...
  24. B

    Finding final Velocity given mass, force, and displacement

    Homework Statement 2.78 kg block is pulled (from rest) by a force (horizontal surface) of 15.8 N. The coefficient of kinetic friction is .106. What is the velocity after 2.88 m? Homework Equations fk=N(uk) Vf=sqrt((2*W)/m The Attempt at a Solution I attempted to find the final...
  25. R

    Vectors, Direction, and Net displacement

    I have been working on the following two problems and I can't seem to get any progress. Any help from anyone would be greatly appreciated. I know it seems simple to those who are familiar but I have no background in this type of equations. 1. A helicopter travels northwest 70.7 miles, then...
  26. D

    Calculating angular displacement of clockhands

    Homework Statement What is the a.d of each of the following hands of a clock in 1h? the second and? the minute hand? the hour hand? Homework Equations That's what I'm looking for The Attempt at a Solution I'm having trouble getting it on paper, just a description of how one of...
  27. P

    Determining displacement of columns equation coefficients

    Homework Statement Determine the constants c_{1},c_{2},c_{3},c_{4} of the column displacement equation where k=\sqrt{\frac{P}{EI}} In lab we subjected 3 specimens to a compressive load in a pinned-pinned and clamped clamped configurations. I have to compare theory results to...
  28. D

    Calculating Peak Displacement of Sinusoidal Motion

    I am looking at sinusoidal motion (shaker tables) and am trying to calculate peak displacement given RMS acceleration. I can easily find the peak displacement using: a_{pk} = 4\pi^2f^2x_{pk} a_{rms} = 0.707a_{pk} as... x_{pk} = \frac{a_{rms}}{0.707\pi^2f^24} My...
  29. G

    What factors affect the displacement range in Hooke's Law?

    I was told that Hooke's Law (F=-kx) only accounts for small displacements. But for some objects the displacement can be greater than with others. I was wonderinig which quality of the objects is responsible for this?
  30. B

    Calculating Displacement & Airspeed with Wind Speed

    wind speed? Homework Statement A car leaves point A and drives at 80.0km/h [E] for 1.50h. It then heads north at 60.0 km/h for 1.00 h and finally [30o W of N] at 100.0 km/h for 0.50 h, arriving at point B. a) Determine the displacement of point B from point A. b) A plane flies directly from...
  31. C

    How Do You Calculate Displacement in Physics Problems?

    Need Some Help With Displacement...please =) I'm working independently on Grade 11 Physics, and ran across a displacement question I need some help with. So here goes: 1. Jessie drove north at 45km/h for 20 min, then turned West and drove at 54km/h for 27min. Finally she drove South at...
  32. S

    Displacement and Velocity Direction Relationship

    Homework Statement Hi, I'm new to physics and to theses forums. Hope to learn a lot and succeed in physics for school and most likely university. I'm just stuck on this one question: Will displacement and velocity always have the same direction? Thanks in advance.
  33. C

    Finding the Resultant Displacement of 4 Vectors

    Hey, guys! I just started my senior high school physics and calculus courses. So far all we have done is the basics of vectors. I can find the resultant displacement of 2-3 vector problems fairly easily. My physics teacher told us to try and make up our own questions, to see if we could do them...
  34. K

    What Can You Tell About the Acceleration of an Object Given Its Position?

    Homework Statement Today, I got a handout of one problem related to acceleration and position. The problem states. If the relation of x=0.5*g*t^2 is given, what can you tell about the acceleration of the object? (single choice. the problem set is one of the following is right) 1)...
  35. H

    Energy question, displacement of a spring

    Homework Statement A 4000 elevator breaks off and falls from rest 12 ft above the surface of a relaxed spring. The elevator has a safety system so that the elevator will always experience a frictional force with a constant magnitude of 1000 lb. The spring constant k is equal to 10 000...
  36. A

    Finding Displacement: Solve for Particle's Position

    I am trying to figure out the displacement from this question: A particle of charge 12x10^-6 C and mass 3.8x10^-5 kg is released from rest in a region where there is a constant electric field of 480 N/C. What is the displacement of the particle after a time of 1.6x10^-2 s. I have tried...
  37. W

    Adding Vectors in Physics 1 to get the Net Displacement

    Homework Statement A car is driven east for a distance of 43 km, then north for 29 km, and then in a direction 29° east of north for 24 km. Determine (a) the magnitude (in km) of the car's total displacement from its starting point and (b) the angle (from east) of the car's total...
  38. R

    What is the correct equation for displacement current density?

    Hi, just to check which equation for Jd (the displacement current density) is correct: 1) Jd = ε0εr(dE/dt), or 2) Jd = ε0(εr-1)(dE/dt) 1) came from the fact that Jd = ε(dE/dt) and ε=ε0εr 2) came from differentiating P = ε0(εr-1)E (since Jd=dP/dt). It's only a minor thing but in a...
  39. M

    How Do You Calculate Average Velocity for an Insect Crawling Across a Pool?

    Homework Statement An insect crawls along the edge of a rectangular swimming pool of length 27 m and width 21 m. If it crawls from corner A to corner B in 30 minutes, (a) what is the average speed, and (b) what is the magnitude of its average velocity?Homework Equations average speed =...
  40. E

    Coin-vertical displacement question and other

    Coin--vertical displacement question and other Homework Statement A Perfectly hemispherical dome with a 10. meter radius is treated with a frictionless coating. A marble and a coin are released from the top of the dome simultaneously. We will assume there is no air friction. The coin will...
  41. Y

    Why is Acceleration Proportional to Negative Displacement in SHM?

    In Simple harmonic motion: Acceleration = -W^2 x (W being omega, rads per sec. and x beind displacement (distance if you will) ) Omega is a constant but why is acceleration proportional to the NEGATIVE displacement, in other words, why MINUS?? Help appreciated. Thanks in advance!
  42. J

    Projectile Motion - given angle, time; need displacement

    Homework Statement A ball is thrown at 60 degrees above x-axis. It remains in the air for 2.9 seconds. What is the final displacement in the x (range) if the ball was thrown with the same initial velocity, but at an angle of 45 degrees above x-axis instead? Homework Equations y = (Voy *...
  43. majormuss

    How to Solve Question 36 on Time-Displacement Diagrams?

    Homework Statement Guys I urgently need help with this question I hfound online. I cannot paste it here because it has all these diagrams which cannot be copied. Could you please just follow the link and tell how best to figure out the question( its the question number 36) The one about the...
  44. S

    What is the displacement from Dallas to Chicago using a flat Earth model?

    Homework Statement A map suggests that Atlanta is 728 mi in a direction of 4.80° north of east from Dallas. The same map shows that Chicago is 561 miles in a direction of 20.8° west of north from Atlanta. Modeling the Earth as flat, use this information to find the displacement from Dallas to...
  45. P

    How Should Strain Energy Be Calculated for a Short Beam?

    Someone please help to solve this its urgent.. Homework Statement Homework Equations The Attempt at a Solution At A-B There is No load so dM/dP= 0 and dU/dP= 0 At B-C M = -px - wx.x/2 dM/dP= -x dU/dP = Wx^4/8EI At C-D M = -Wb + Px dM/dP = x dM/dP = -Wbx^2/ 2EI When i...
  46. R

    What Is John's Resultant Displacement on the Highway?

    While John is traveling along a straight inter- state highway, he notices that the mile marker reads 236 km. John travels until he reaches the 140 km marker and then retraces his path to the 173 km marker. What is John’s resultant displacement from the 236 km marker? Answer in units of...
  47. P

    How to Calculate Strain Energy for a Beam?

    Any one can help me solving this pleasezzzz http://i49.tinypic.com/2vkm2r8.jpg" My attempt At A-B There is No load so dM/dP= 0 and dU/dP= 0 At B-C M = -px - wx.x/2 dM/dP= -x dU/dP = Wx^4/8EI At C-D M = -Wb + Px dM/dP = x dM/dP = -Wbx^2/ 2EI When i include all vaues...
  48. B

    What is the displacement of the blue piston?

    The purpose is to investigate the relationship between the cylinder diameter and the range of motion of a piston in a hydraulic system. The teacher didn't give any initial of final position at all, so I think the teacher means in general. Homework Statement What is the displacement of the...
  49. F

    Pressure and Displacement sound waves. Pressure always lead?

    A sound wave can be interpreted in any of four ways. Two of those involve the correspondence between (1)displacement and position and (2)pressure and position. [By "position" here I refer to the distance from the source. Positive refers to going away from the source.] These waves are 90...
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