What is Displacement: Definition and 999 Discussions

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. S

    Effect of air resistance on angle yielding max displacement

    Considering simple projectile motion, would the effect of air resistance cause the angle for maximum horizontal displacement to change? Would the maximum angle then be greater or less than 45 degrees? Just a conceptual question, don't really need equations (though wouldn't mind either).
  2. T

    What is the mathematical relationship bewtween pressure and displacement?

    Homework Statement I'm having trouble understanding the relationship between pressure, speed, and displacement to answer the following question correctly: While you are stopped at an intersection turn lane, a large truck zooms by, just a few feet from your car. As the truck passes, your car...
  3. S

    Angular forms of acceleration, velocity and displacement

    I have been going through my equations and writing them up on the computer so I can refer to that when needed and have go to angular acceleration, velocity and displacement equations yet I don't have very many equations for those topics and I wondered if anyone had some equations for finding...
  4. beyondlight

    Particle displacement by a speaker in a gas tube

    A speaker is generating waves in a gas that is closed in a tube. The tubes closed end is at x=0 and the speaker is at x=1. The motion of the membrane is given by s=s_0 \cdot sin(\omega t) How does the particle displacement vary with x and t? The wavelength is \lambdaI do not know how to solve...
  5. J

    What is the Displacement of a Particle from t=1s to t=3s?

    Homework Statement Determine the displacement of this particle from t=1s to t=3s r=-(5,0m/s)t i + (10,0m/s^2)t^2 j + (7,0m -(2,0m/s^3)t^3) k Homework Equations The Attempt at a Solution I don't have an idea how to do this if I should to it by replacing t by 1 and then...
  6. J

    Wien's displacement law's proof

    When I was doing my assignment, I need to proof the Wien's Law. The question given frequency dependent energy density function. So differentiate it respect to frequency v. Equate it with zero, and solve. i solved the value a=2.82144 = hv/KT=hc/(lambda)KT, i cannot get a correct value for the...
  7. I

    Work and displacement of the point of application

    I have this example from my physics books which says: If a skater pushes against the wall and the skater moves, the wall does no work and the motion of the skater only results from the internal work of the skater. It also says that the wall does no work because there is no motion of its point...
  8. A

    Calculating Displacement of a Spring with Two Forces

    Homework Statement My question is what is the displacement of a spring if the spring is stretched by two forces, each acting on an end of it? I've looked on the internet but I've only found examples where the spring is attached to a ceiling. Are there two restoring forces acting from...
  9. teroenza

    Electric field, potential, and Charge Displacement

    I am confused about an electron ( or any negative charge) moving in a uniform E field. If the electron moves in the opposite direction of the electric field, and the E field points in the direction of greatest decrease in potential, then it seems like the electron is moving in the direction of...
  10. D

    Self-Diffusion, two versions of mean square displacement

    Dear all, in self diffusion theory you can see in different books, different definitions of the mean square displacement: <r(t)^2> = \frac{1}{N} \int d\vec{r} \ \vec{r}(t)^2 c( \vec{r} ,t) where c(r,t) is the particle concentration and N the number of particles. or <r(t)^2> =...
  11. P

    SHM - Equation for Displacement

    Hi, I just learned my first equation today in SHM: x = xo cos (ω * t) Firstly, is it ok if I change the "x =" part for a "y="? I get a bit confused since, from what I understand, we want to find the vertical distance from the x-axis and that would be the y output of a function. (x makes...
  12. R

    How to find displacement of 400m track

    Homework Statement I know this is basic but I'm stumped Homework Equations a runner runs 6.5 laps around a 400m track, what's the displacement. I thought it would be 200m but the answer provided says 160m and I just can't work out how to get to this answer The Attempt at a Solution
  13. R

    Compensate for the displacement of an accelerometer measurement

    Hello I want to measure the lateral acceleration at the center of gravity of a vehicle. I cannot place the accelerometer here since I cannot mount it properly so I have placed it 75 cm to the left of the CG. The longitudinal and and vertical placement is approximately correct. It there som...
  14. L

    Constant acceleration velocity and displacement

    Homework Statement At the instant the traffic light turns green, an automobile starts with a constant acceleration a of 2.2 m/s2. At the same instant a truck, traveling with a constant speed of 8.6 m/s, overtakes and passes the automobile. (a) How far beyond the traffic signal will the...
  15. R

    Maximum displacement from equilibrium of the mass as it osciallates

    A mass of 0.1 kg connected to a spring with a spring constant 10 N/M oscillates horizontally on frictionless table. The speed of the mass is 3.0 m/s when the displacement is 0.2 m form its equilibrium position. What is the maximum displacement from equilibrium of the mass as it oscillates...
  16. Z

    Displacement in the 5th second.

    Homework Statement A particle has an initial velocity of 9m/s due east and a constant acceleration of 2 m/s2 due west. The distance covered by the particle in the fifth second of its motion is? The Attempt at a Solution Using the formula for the displacement in the nth second, Sn = u...
  17. D

    Displacement Meter- Simple Harmonic Motion

    Homework Statement The figure attached shows the meter used to study the motion yB = bsinωt. The motion of the mass relative to the frame is recorded on the drum. If l1= 360 mm, l2= 480 mm, l3= 600 mm, m = 0.9 kg, c = 1.4 Ns/m and ω = 10 rad/s, Determine the range of the spring...
  18. M

    Thermodynamics total engine displacement help

    Homework Statement A 6 cylinder engine has cylinders wirh a bore of 115mm and a stroke of 145mm Each cylinder also has a clearance volume of 300 cubic centimeter. This engine operates on a four stroke ideal otto cycle and at 3000 rpm. The temperature and pressure of the intake air is 25...
  19. E

    Air Displacement: Effects of Multiple Fans

    Ok, I have a question I have been wondering about. If you have a tube and insert one fan into it. The fan turns to create a certain air displacement. If you put 2, or 3 etc. fans into the tube spinning at the same speed, would it displace more air? or would each fan simply move the air...
  20. 9

    Displacement of a composite beam

    Lets say I have a beam with a cross section made of half aluminium and half steel glued together. I would like to know how to calculate the deflection of this beam due to bending moment but I am unsure of how to use the virtual work equation to accomplish this. Should I use a different...
  21. A

    Conduction to Displacement Current Ratio

    Homework Statement For copper we find that J=\sigmaE , where \sigma has the value 5.8x10^7 mksc units. If an alternating electric field represented by E0ei\omegat exists within the copper. Find the ratio of the conduction to the displacement current density at a frequency of 1megacycle/sec...
  22. L

    Stress Displacement at Elevated Temperatures

    I was doing a FEA Stress Analysis of an Alum (6063 T6) part and set the Ultimate and Yield Strength of the material lower to model the behavior at 150 degress C. The displacement (movement) of the model was exactly the same for relatively small forces. The force was 110 N and the Ultimate...
  23. P

    Finding the displacement thru position vectors

    Homework Statement A particle is displaced by 10m along a direction joining 2 points having coordinates A(2,3,4) and B(-4,-5,3).Find the displacement vector if the time of the motion is 2.5 seconds.Find avg. velocity of this particle. Homework Equations vector AB = (x2-x1)i + (y2-y1)j...
  24. G

    Calculating Change in Free Energy from Rod Displacement

    hi i have a question concerning free energy in the attached file you can see 3 rods. think of them as 3 parallel forces, that attract each other by a force F. the force is some arbitrary force of the form: F=a/r^6 where a is a real parameter now imagine that caused by fluctuations(e.g...
  25. P

    Initial vs. Final velocity of projectile with no net displacement

    if a ball is thrown and caught at the same height with constant horizontal velocity and no vertical displacement is its initial and final velocity the same? since v2y^2=v1y^2+2aDy, no displacement means final vertical velocity will be the same as initial, since v2x=v1x, horizontal velocity...
  26. G

    Find Work Done on 230 kg Crate in 12 m Displacement

    Homework Statement A 230 kg crate hangs from the end of a rope of length L = 12.0 m. You push horizontally on the crate with a varying force to move it distance d = 4.00 m to the side (Fig. 7-43). (a) What is the magnitude of when the crate is in this final position? Figure...
  27. J

    Can you work out power without knowing displacement?

    Homework Statement I'm a bit confused by a question asking me to work out the power of a bike traveling up an inclined plane with a constant speed. I have the mass and friction and the speed but no displacement so I don't know how I could work out power if to find the work I need to factor...
  28. C

    Displacement of a Transverse Wave on a String Question

    Homework Statement Question 1 (a) The displacement of a transverse wave on a string is described by: y(x, t) = 0.01 sin(4x + 200t + \pi), where all quantities are expressed in SI units. i) Determine values (with appropriate units) for the period, wavelength, and phase velocity of the wave...
  29. K

    Integrating Electric Displacement

    Suppose the dielectric material is fixed in position and filling the capacitor, and you would have this term in the way of calculating something. \int\nabla\cdot\left[\left(\Delta{D}\right){V}\right]{d}\tau where D is the dielectric displacement Now that turns into (by divergence...
  30. W

    Vertical displacement of electron

    Homework Statement An electron with a speed of 1.9 × 107 m/s moves horizontally into a region where a constant vertical force of 4.3 × 10-16 N acts on it. The mass of the electron is 9.11 × 10-31 kg. Determine the vertical distance the electron is deflected during the time it has moved 34 mm...
  31. B

    Displacement of spring, block down an incline

    Homework Statement An inclined plane of angle θ = 20.0° has a spring of force constant k = 460 N/m fastened securely at the bottom so that the spring is parallel to the surface as shown in the figure below. A block of mass m = 2.55 kg is placed on the plane at a distance d = 0.288 m from the...
  32. S

    Finding Angular Displacement in a Pirouette

    Hey, I have a very easy problem. A dancer completes 2.2 revolutions in a pirouette. What is her angular displacement? here's my work. Given: 2.2 revolutions. Battle Plan: Find angular position in radians. Subtract final position with the initial position. Outcome: 2.2 x 2pi = 4.4 pi...
  33. I

    Displacement current inside capacitor

    Hi I have already solved the problem. I just have some doubts about the solution given in the solution manual. This is "Physics for scientists and engineers" by Serway, Jewett In the solution for part b) , the author has taken the area of whole Amperian loop while calculating the electric...
  34. T

    How Is Work Calculated When Pushing a Desk Across a Rough Surface?

    Homework Statement Amadeus pushes horizontally on a desk that rests on a rough wooden floor. The coefficient of static friction between the desk and the floor is 0.800 and the coefficient of kinetic friction is 0.620. The desk has a mass of 94.0 kg. He pushes just hard enough to barely get the...
  35. T

    How Much Work Does Amadeus Do on the Desk?

    Homework Statement Amadeus pushes horizontally on a desk that rests on a rough wooden floor. The coefficient of static friction between the desk and the floor is 0.800 and the coefficient of kinetic friction is 0.620. The desk has a mass of 94.0 kg. He pushes just hard enough to barely...
  36. D

    What is the work done by kinetic friction on a desk pushed on a rough surface?

    Homework Statement In the above problem, Amadeus pushed horizontally on a desk that rests on a rough wooden floor. The coefficient of static friction between the desk and the floor is 0.800 and the coefficient of kinetic friction is 0.620. The desk has a mass of 94.0 kg. He pushes just hard...
  37. E

    Can Displacement Be Calculated Without Drawing a Scale Diagram?

    Homework Statement An orienteer runs 5km east, 4 km south and 1km west. If she completed the course in exactly 1 hour, calculate her displacement from the start. Homework Equations There were questions before it I've already answered but I am not sure if I can do this question through...
  38. N

    Displacement of an axially loaded beam

    Homework Statement The 30mm diameter A-36 steel rod (E=200x10^9 Pa) is subjected to the loading shown. Determine the displacement of end A with respect to end C. (see attached picture) Homework Equations \delta = \frac{PL}{EA} (eq. 1) where delta is the deflection, P is the internal...
  39. C

    Kinematics, Displacement from Velocity-Time

    Homework Statement Andrew is driving his van to deliver groceries in Elmvale. As he travels along Hwy 92, a fox stops on the road. Andrew is traveling at 75 km/h [North] and is 42 m away from the fox when he applies his brakes. It takes him 3.4 s to stop. a) How far did Andrew travel...
  40. H

    About small displacement method for phonons

    Dear All, I have trouble to understand the calculation of phonon using small displacement method. I found people said the limitation of this method was that it requires the wave vector k orthogonal to the supercell size(?). Does it mean the wave vector is not any you want? why? I got really...
  41. N

    Calculate Displacement at Any Frequency: f_modal, d_modal, f_actual

    So I have been trying to figure out how much an object is displaced when subjected to certain frequencies. If I know the modal frequency and max displacement at modal frequency can I find displacement at any frequency? I was thinking maybe using ratios you could do the following, modal...
  42. L

    Figuring Out Displacement Vector Direction

    There is an attached image I couldn't figure out how to make it in the post. The attempt at a solution a) So I know that the direction of the velocity vector will be in the direction on the displacement vector from P to Q: 2i+5j+3k I also know that the magnitude of the velocity vector is...
  43. T

    Electric displacement of a uniformly polarized sphere

    Homework Statement Suppose we have a uniformly polarized sphere of radius R. The polarization vector is \mathbf{P}. Goal: To find the electric field everywhere. Homework Equations I know the actual solution already. It should be \mathbf{E} = \frac{-1}{3 \epsilon_0} \mathbf{P} The Attempt...
  44. P

    Displacement of a steel rod - don't know how to begin

    The A-36 steel rod is subjected to the loading shown. If the cross-sectional area of the rod is 50 mm^2, determine the displacement of C. Neglect the size of the couplings at B, C, and D. Please help, I don't have any idea how to begin. I can't seem to sum the forces right.
  45. T

    Total Displacement with directions

    Homework Statement A car is driven east for a distance of 48 km, then north for 26 km, and then in a direction 30° east of north for 28 km. Draw the vector diagram and determine the total displacement of the car from its starting point and its direction. Homework Equations im not...
  46. K

    Checking my work - Displacement

    A boat which travels 100km[N], then 40km[N], and finally 80km [S]. The entire trip takes 6.5 hours. Calculate the total displacement of the boat d = d2-d1 d = (-80) - 140 d = -220 d = 220km[S] Just want to make sure this is correct. Thanks
  47. E

    Relative Motion- Airplane vs radar station and tracking the displacement

    Relative Motion-- Airplane vs radar station and tracking the displacement In Figure 4-49, a radar station detects an airplane approaching directly from the east. At first observation, the airplane is at distance d1 = 340 m from the station and at angle θ1 = 34° above the horizon. The airplane...
  48. S

    Clarification required: polarization density and displacement field

    Hi! I can't wrap my head around the formula \textbf{D} = \epsilon \textbf{E} + \textbf{P}. The electric field, \textbf{E}, goes through the dielectric. It polarizes the atoms/molecules, which creates a field going the opposite way, which cancels out at least part of \textbf{E} (right?)...
  49. C

    Finding displacement of a drag car stopping

    Homework Statement A drag racer, starting from rest, accelerates to ¼ mile with a constant acceleration whose magnitude is 12.427 m/s2. At the end of the ¼ mile, a parachute opens, slowing the car down and bringing the car to a stop after 40 seconds. From the time the parachute opened, how...
  50. O

    Relating force, displacement, time and velocity

    Homework Statement A duck has a mass of 2.7 kg. As the duck paddles, a force of 0.13 N acts on it in a direction due east. In addition, the current of the water exerts a force of 0.20 N in a direction of 54° south of east. When these forces begin to act, the velocity of the duck is 0.13 m/s in...
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