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. DaTario

    Coaxial cables and displacement current

    Hi All, Consider a situation in which a coaxial cable have electric current i(t) = Imax * cos(w*t) flowing through its cilindrical inner cylindrical core (with radius a) and the inverse current flowing on its surface cover (with radius b). I would like to know if it is correct to say that...
  2. P

    Displacement/ Velocity/ Acceleration Clock Question

    A clock has a 20cm minute hand. From the 6PM mark to the 9PM 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...
  3. R

    Field and Displacement Inside Carvities Within A Dielectric

    Homework Statement Suppose the field inside a large piece of dielectric is \vec{E}_{0}, so that the electric displacement is \vec{D}_{0}=\epsilon_{0}\vec{E}+\vec{P}. a. Now a small spherical cavity is hollowed out of the material. Find the field at the center of the cavity in terms of...
  4. alane1994

    MHB How to Calculate Distance Traveled with Velocity Function

    Here is my question. The function v(t)=15\cos{3t}, 0 \leq t \leq 2 \pi, is the velocity in m/sec of a particle moving along the x-axis. Complete parts (a) through (c). a.Graph the velocity function over the given interval. then determine when the motion is in the positive direction and when...
  5. H

    Joos's Treatment of Virtual Displacement

    I having a bit of trouble understanding Joos's treatment of virtual displacements. I am referring to pages 114 and 115 of Theoretical Physics, By Georg Joos, Ira M. Freeman http://books.google.com/books?id=vIw5m2XuvpIC&printsec=frontcover&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false...
  6. D

    Phase Lag between Force & Displacement in Forced Vibration w/ Viscosity Damping

    Dear all, Can anyone explain the the phase lag between force and displacement in single degree of freedom forced vibration with viscosity damping? The response of phase angle derived by mechanical vibration as below ( assuming force is excited harmonically) : Phi(ω) = arctan( C*ω / ( K...
  7. A

    Initial Velocity of Projectile Motion, given displacement and initial angle?

    Homework Statement A grasshopper jumps 1.00 meters from rest, with an initial velocity at a 45.0° angle with respect to the horizontal. Find (a) the initial speed of the grasshopper and (b) the maximum height reached.Homework Equations vx = v0xt = v0cos θ0 vy = v0 sin θ0 - gtThe Attempt at a...
  8. P

    Golfer's Putt Challenge: Angle & Displacement

    A golfer lines up for her first putt at a hole that is 13 m exactly northwest of her ball’s location. She hits the ball 13 m and straight, but at the wrong angle, 39° from due north. a) In order for the golfer to have a “two putt green,” determine the angle of the second putt...
  9. U

    Find potential energy function and show that it is proportional to displacement

    Homework Statement Find the potential energy function for a spring if the origin is placed at the wall and the unstretched length of the spring is L. Show that with a suitable choice of the constant, this potential function is proportional to the square of the amount that the spring is...
  10. L

    Displacement from Acceleration data

    I was looking for some help on getting displacement from acceleration data (using an accelerometer). I found this old PF thread - https://www.physicsforums.com/archive/index.php/t-123128.html I am familiar with the double integration/trapezoidal integration. It isn't much help. The FFT method...
  11. Q

    Displacement and arc length problems

    1. v=s/t where s represents the displacement 2. s=rθ where s represents the arc length v=rθ /t Why can substitute here? I guess that is not same things. An arc length is not a straight line but displacement is which is shortest distance between initial and final point.
  12. V

    Free-fall kinematics on a plane: Displacement from Window to Ground?

    Homework Statement A ball is thrown vertically upward from a window at 10m/s. It hits the ground 5.0 seconds later. What is the height of the window from the ground? Given Vi = 10 m/s Vf = 0 Δt = 5.0 m/s Δa = -9.8 m/s^2 Find Δd(w-g) = ?Homework Equations Δd = Vi(Δt) + Δa(Δt)^2 And the...
  13. A

    Water column displacement physics?

    Hi, in this setup we have a bucket of water 10 kgs of water inside. Attached is a weight meter measuring that in fig a. The weight is exactly 10kgs. In fig b. A piston (red) is being pulled by a weight (z). "z" has a pull force equivalent to the volume of the column of water above the piston...
  14. A

    Graphene: Displacement of atoms out of the 2D Plane

    Hello- I am trying to find a reference describing the z(or c) component of the basis vectors for graphene. I seem to recall that there is a slight bend such that half of the atoms lie slightly above the plane. However, every paper I have found references the perfect 2D lattice of Graphene...
  15. O

    How far is the bat from the wall when it hears the echo?

    Homework Statement From Tipler & Mosca, Ch. 2, #56 (pg. 57) Bats use echo location to place themselves. (I condensed all of this from the problem) So: Bat flying at 19.5 m/s toward a vertical cliff. Bat clicks. Bat hears the echo 0.15 s later. (click travels at 343 m/s) How close is the bat...
  16. A

    Confusion on displacement question

    Homework Statement A car moves east at 18 m/s for 5 minutes. What its displacement? It says that the answer to this question from my teacher is: 5400 m. Homework Equations → → X= v *t The Attempt at a Solution → V= 18 m/s [E] t= 5 min. → → → X= v *t =...
  17. S

    Solving Circular Motion Problems: Displacement, Speed, & Acceleration

    Homework Statement I do not know if this is the correct forum to post this in but here goes. I got all of the answers correct, but I just have a question on part F. 1.) The figure shows a motion diagram of a particle in circular motion at a constant speed. The axes have units of...
  18. V

    How much time does it take to change your displacement by 25.0m east?

    As you walk to class with a constant speed of 1.65 m/s , you are moving in a direction that is 16.2° north of east. How much time does it take to change your displacement by 25.0 m east? I know that v0 = 1.65 m/s. Would I use the equation: x = (v0 cosθ)t?Any help or advice would be much...
  19. A

    Integration of an equation to find displacement

    Homework Statement Homework Equations Above The Attempt at a Solution Okay, so I understand I need to integrate the top equation because it's velocity as a function of time. I just don't know how.
  20. P

    A question about acceleration and displacement

    Hey everyone. I'm sort of new to the whole physics world (I'm doing it in highschol currently). I have one question that I apparently can't figure out. An object accelerates uniformly from rest. After 7.50s, the velocity is 53.2m/s north. What is the displacement? I first did d=tv and got...
  21. B

    Position ~ Time Graph vs Displacement ~ Time Graph

    1. Are these two the same? I'm not sure. Sometimes my teacher labels the Y axis with a Delta Displacement [E]. Other times it's just Position (M), so I'm not sure how to identify if we are finding Speed or Velocity. I'm just assuming they are the same. 2. Also, position is a Vector quantity...
  22. U

    What Is the Displacement of the Centre of Mass When a Man Climbs a Ladder?

    Homework Statement A pulley fixed to a rigid support carries a rope whose one end is tied to a ladder with a man and the other end to a counterweight of mass M. The man of mass m climbs up a distance h with respect to the ladder and then stops. If the mass of the rope and the friction in the...
  23. J

    Can displacement be greater than, less than, or equal to total distance?

    In a hypothetical situation, including every type of hypothetical situations, can a displacement be greater than, less than, or equal to the total distance?
  24. V

    Displacement & Average Velocity

    Homework Statement A car travels in a straight line at 40 km/hr for 1 h and 60 km/hr for 2 h. A) How far does it travel? B) Find the average velocity. Homework Equations Average velocity = Δx/Δt (change in distance/change in time) The Attempt at a Solution In solving for A, I...
  25. M

    Displacement Vectors finding magnitude of R and theta

    Homework Statement The displacement vectors A and B, when added together, give the resultant vector R, so that R= A+B . Use the data in the drawing and the fact that = 29° to find the magnitude R of the resultant vector and the angle θ that it makes with the +x axis. I am unsure how to...
  26. D

    Magnitude of Displacement for Harmonic Oscillator

    Homework Statement A harmonic oscillator has angular frequency ω and amplitude A. What is the magnitude of the displacement when the elastic potential energy is equal to the kinetic energy? (Assume that U = 0 at equilibrium.) Express your answer in terms of the variables ω and A...
  27. P

    Position and Displacement Vectors- The Watermelon Seed Vector

    A watermelon seed has the following coordinates: x = -6.6 m, y = 2.2 m, and z = 0 m. Find its position vector as (a) a magnitude and (b) an angle relative to the positive direction of the x axis. If the seed is moved to the xyz coordinates (8.2 m, 0 m, 0 m), what is its displacement as (c) a...
  28. K

    Adding vectors algebraically to find displacement

    Hi everyone, I am taking a physics course this year and I find myself already looking for help unfortunately. I think I understand the basics of adding vectors using Ax = A cosθ , Ay = A sinθ, etc. I am getting confused with the 3rd leg of the trip though. Since it is due west wouldn't that...
  29. G

    Why does Wien's displacement law predict infinite radiation energy?

    Wein's displacement law is E (T,ν) = = v3F (v/T) This is from Omnes' book on QM He doesn't explain why the total radiation is infinite. I'd like to know why.
  30. M

    Displacement Operator definition

    Hi, Could someone explain how the following two definitions of the displacement operator are equal? The first is the standard one 1) e^{\alpha a^{\dagger}-\alpha*a} But what about this one? This is from a Fock state decomposition of a coherent state. 2) e^{\frac{-|\alpha^{2}|}{2}}e^{\alpha...
  31. M

    Simple Harmonic Motion: Displacement after s seconds

    The question is: A 56.0 kg bungy-jumper hangs suspended from her bungy-cord, at rest. She is displaced from this position by 15.0 m downward, and then released. She bounces up and down, with a period of 5.800 s. Assume the woman undergoes simple harmonic motion, described by y(t) = X cos(2...
  32. M

    Exploring Virtual Displacement w/ D'Alembert Principle & Examples

    Viruat Displacement? What is Virtual Displacement in D'Alembert principle??Please explain with a good example...:eek:
  33. N

    A Child's Circular Adventure: Calculating Distance and Displacement

    Homework Statement A child rides on a pony around a circular track with a radius of 4.5 meters. Homework Equations What is her distance traveled and displacement after she has gone half way around the track? The Attempt at a Solution
  34. V

    How to calculate displacement from density?

    If this the wrong section to post this, please know that I am very sorry, but I don't know much about any of the things going on, on here so please bare with me. Say you got some powder, and say this powder has a density of 1.06g/cm3 (or 1.06g/mL, right?). Now say you want to put 2500mg...
  35. M

    Does Gas Displacement Occur in Apparatuses Producing Oxygen Gas?

    Hi. I was just wondering if gases displace each other. For example, if I set up an apparatus to produce oxygen gas like the one shown in this diagram would the oxygen produced in the flask displace the air that is already present in the apparatus? Or would the oxygen gas and air simply "mix"?
  36. M

    Calculating the magnitude of displacement

    A car us driven at a velocity of 72km/h EAST for 0.50hr, 48km/h NORTH for 0.25hr, and 62km/h WEST for 0.50hr. Calculate the magnitude of its displacement. Attempt at the solution: Distance = Speed * Time (72 x 0.5) + (48 x 0.25) - (62 x 0.5) = 17km However, the answer in the book...
  37. D

    Newton's Cannon: Finding the displacement, velocity, acceleration

    I'm working on a Java project to simulate Newton's Cannon (example: http://spaceplace.nasa.gov/how-orbits-work/). How do I find the x and y components of displacement, velocity and acceleration of the projectile after a time Δt? I know that I need to use Newton's law of gravitation, however I...
  38. M

    Displacement current between two parallel plates

    OK, I was thinking about transformers and mutual induction and then drifted onto displacement current. I then decided to build a simple test apparatus and test for the magnetic field between two parallel plates. using a variety of coil designs to have as much of the windings perpendicular to the...
  39. 3

    Material Studio: Assigning Displacement to a Model Edge

    http://community.accelrys.com/servlet/JiveServlet/showImage/2-14223-12512/%E5%9B%BE%E7%89%871.png I want to assign displacement to the top edge of the above model in Material Studio. How to realize it ? Thank you !
  40. V

    Displacement of mass fired by a slingshot problem

    Homework Statement A catapult (slingshot) is used to fire a ball of mass 0.2kg vertically into the air. The elastic is stretched so that there is a tension of 40N in both 'sides' of the slingshot, ie on the elastic on either side of the mass (I am trying to describe a diagram here, so...
  41. A

    Velocity, displacement and position time graph help

    Velocity, displacement and position time graph help! cyclist road east for 1.0x10^2 m with a constant velocity of 25 m/s she then accelerates down a hill and 5s later reached the bottom of the hill with a velocity of 50m/s a) how long did the cyclist ride before reaching the hill? B)what is...
  42. Y

    Net Displacement: Subtracting E from W Direction Vectors

    Is it valid to subtract a position vector of direction E with one of direction W or do they both have to have the same dierction when using the net displacement formula?
  43. V

    Displacement and acceleration ( SHM? )

    Homework Statement A small body is undergoing simple harmonic motion on a frictionless horizontal surface with an amplitude of 0.13m. At a point 0.05 m from equilibrium the velocity is 0.24 m/s. a.) what is the period? What is the displacement and acceleration when the velocity is ±0.10 m/s...
  44. E

    Displacement with a velocity time graph that is a parabola

    Homework Statement How would you find the displacement of a velocity/time graph when it is in the shape of a parabola? Homework Equations I know Velocity x time = displacement. The Attempt at a Solution I know that velocity x time = displacement, but how do you find the area under...
  45. M

    Question on circular motion, finding out the angular displacement in a clock.

    Homework Statement A clock is showing 3.30. Calculate the angular displacement in degrees from the 12.00 position of the clock to: i the minute hand ii the hour hand I got my minute answer as 180 degree, which is right. But my second answer was 90 degrees, which apparently is wrong! the...
  46. M

    How to find the missing displacement (vectors)?

    Homework Statement After three days of hiking, a group of hikers are 30km N from their starting position. On the first day, they hiked 20km E. On the second day, they hiked 30km 53 degrees N of W, calculate their displacement on the third day. Homework Equations I haven't a single clue...
  47. Y

    Position and Displacement question.

    Homework Statement You walk to the corner store after school to buy a carton of milk before going home. The store is 750 m south of the schoo, and your house is 625 m north of the school. What is your net displacement. Homework Equations dT=d1+d2 formula for displacement The...
  48. S

    Get the stress tensor using virtual displacement principle

    Homework Statement Using method of virtual displacement get the stress tensor for this problem. http://img32.imageshack.us/img32/7272/problemba.png The attempt at a solution The given system is 4-times tatically indeterminate. Since it is symetrical we can split it in half vertically...
  49. W

    Maximum displacement covered by a body in time half of its own time period?

    Hi everyone! Anyone knows what is the maximum displacement covered by a body in a time equal to half of its time period? Please also give an example. Thank you.
  50. P

    Calculating constant velocity, deceleration, and total displacement

    Homework Statement An object starts at rest and accelerates at 2.5 m/s^2 for 12 seconds. It then moves at a constant velocity for 5.0 seconds and then slows down uniformly at 1.5 m/s^2 until it stops. Calculate: a) the constant velocity b) the time taken for deceleration c) the total...
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