# Displacement Definition and 75 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. ### Is there a forum for NYC physics standards K-12?

I am a new tutor working with students in 11th grade physics in New York City. I am required to keep notes internally on the sessions and the standards that I cover in them; after noticing that the physical science standards don’t include mentions of velocity or displacement as a content area, I...
2. ### Displacements in a system of two masses connected by three springs

Figure : Option of question : Solution attempt :
3. ### Truss behaviour, load-deformation curve

Hello everyone! I am analysing an 18 m per 1.2 m truss, simply supported, with 140x5 chords and 90x8 braces. I then loaded the superior nodes with 500 KN. The top nodes were also laterally constrained to prevent out-of-plane displacements. After imputing the structure in Abaqus (FEA software), I...
4. ### How to find d2 when given d1 and d, total time, and average velocity?

I rearranged the displacement formula to d2 = d + d1. I used cosine law to solve for d2 since the triangle is not right-angled but I am not getting the correct answer or angle for d2. The angle I used in cosine law (based on the diagram) was 32+12+90 = 134. d = v(t) = 130(3) = 390 km/h [N 32 E]...
5. ### Direction of resulting displacement

I do not understand part b. I know that x180/pi changes the value into a degree, but i do not understand what's going on inside the bracket. And how did the equation calculated the direction?
6. ### I What precisely is "Recoil"?

I am having some difficulty understanding what "recoil" really is with respect to momentum, force, and and time. On the one hand, momentum is considered to be the product of mass and velocity or perhaps the product of the sum of masses and some velocity, or some variant of P=mv, where P is a...

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8. ### Question about net work and displacement

I know that by physics definition if displacement is zero, work is zero. However, if I push an object 5 m to the east, and then move to the other side of the object and push it 5 m back to the west. I think in this case I have always done positive work on the object and hence the total work...
9. ### Convert cylindrical coordinate displacement to Cartesian

Summary: I can't figure out how the solver carries out the conversions from cartesian to cylindrical coordinates and vice-versa. I have a set of points of a finite element mesh which when inputted into a solver (ansys) gives the displacement of each node. I can get the displacement values of...
10. ### Inertial force acceleration (vertical axis)

Hi, How is the inertial force Fi (acceleration) when the system is vertical. I noted Fi_horizontal=m.a, Ff=mg.μ.cos(Θ) et Fg=mg.sin(Θ) .
11. ### Calculate the displacement? (Projectile motion problem)

Homework Statement A projectile is launched at an angle of 60° from the horizontal and lands 99 s later at the same height from which it was launched. 1) What is the initial speed of the projectile (in m/s)? I already figured this out to be 560.16 m/s 2) What is the maximum altitude (in m)...
12. ### Map question involving vectors (find the angle)

Homework Statement Instructions for finding a buried treasure include the following: Go 66.0 paces at 256deg, turn to 140deg and walk 125 paces, then travel 100 paces at 169deg. The angles are measured counterclockwise from an axis pointing to the east, the +x direction. Determine the resultant...
13. ### Distance traveled (DeltaD) and acceleration

Homework Statement What happens to the distance traveled in the same amount of time as an object accelerates? Homework Equations None[/B] The Attempt at a Solution None[/B]
14. ### Kinematics: Ball thrown off of a building

Homework Statement A ball is thrown off of a building in the +x direction at 10m/s. If the ball takes 2s to land, how tall is the building? Homework Equations Vf=Vi(a)(t) Δd=Vi(t)+1/2(a)(t) Vf^2=Vi^2+2(a)(Δd) Δd=1/2(Vf-Vi)(t) The Attempt at a Solution Vf: 0m/s Vi: 10m/s a: -9.8m/s^2 t: 2s...
15. ### Force and motion

<< Mentor Note -- New poster has been reminded to use the Homework Help Template when posting schoolwork questions >> A 25.0 kg sled is pulled (assume frictionless) with a force of 15.0 N at an angle of 20 degrees above the horizontal. (a.) How long will it take to pull the sled 25m? (b.) How...
16. ### Physics Vector Problem

Homework Statement You enter an antique classic car road rally with your 1956 Studebaker Golden Hawk. The rally course consists of the following segments: travel north at 25.0 m/s for 30.0 min, then east at 32.0 m/sfor 40.0 min, and finally northeast at 30.0 m/s for 50.0 min. For the entire...
17. ### A projectile's initial velocity without time?

Homework Statement A projectile is launched: Horizontally, with an average displacement of 49 cm Vertically, with an average displacement of 28 cm At a 23 degree angle, with average displacement of 126 cm Homework Equations The Attempt at a Solution I am sad to say I don't know how to do it...
18. ### How can I find this displacement?

Homework Statement Your task is to estimate how far an object traveled during the time interval 0≤t≤8, but you only have the following data about the velocity of the object. *First image You decide to use a left endpoint Riemann sum to estimate the total displacement. So, you pick up a blue...
19. ### Quick Question about Pendulum Graphs

Hi everyone. I just have a very quick question regarding position time graphs and velocity time graphs for a pendulum. As we know, at the maximum displacement, the acceleration is at its maximum and the velocity is zero, and vice versa when the displacement is zero. When we put this...
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### 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...
21. ### 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...
22. ### 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...
23. ### 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...
24. S

### Precise Vertical Movement

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...
25. 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...
26. ### 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...
27. ### 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...
28. ### 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...
29. ### 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...
30. ### 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...
31. ### Finding time of how long the block travels (SHM)

Homework Statement A small block is attached to an ideal spring and is moving in SHM on a horizontal, frictionless surface. When the amplitude of the motion is 0.090 m , it takes the block 2.52 sto travel from x= 0.090 m to x= -0.090 m . If the amplitude is doubled, to 0.180 m , how long does...
32. ### Simple Harmonic Motion: Finding displacement at given time t

Homework Statement A 1.10 kg mass on a spring has displacement as a function of time given by the equation x(t)=(7.40cm)cos[(4.16rad/s)t−2.42rad]. Find the position of the mass at t=1.00s; Homework Equations x = Acos(ωt+∅) The Attempt at a Solution I tried to just plug in the time t in that...
33. ### What can you predict given acceleration and initial velocity

Homework Statement If you know the acceleration of a car and its initial velocity, you can predict which of the following? A. The direction of the car's initial velocity B. The magnitude of the car's final velocity C. The displacement of the car D. All of the above Homework Equations I said...
34. ### Does displacement=shortest length of position (final-initial)?

Homework Statement if displacement is the shortest distance between two point then that would also meant that it is equivalent to the hypotenuse when using phytogaras theorem right?. but why isn't displacement the shortest length between two point ?because Xinitial - Xfinal couldn't posibly be...
35. ### Kinematics Question on falling rock

Homework Statement A rock is thrown straight upward from the edge of a 30m cliff, rising 10m, then falling all the way down the base of the cliff. Homework Equations The Attempt at a Solution Well, because the rock was thrown 10m up, and then it came all the way down, I added those...
36. ### Exercise about the wavefunction

Homework Statement [/B] Consider an ideal rope where there is a wave moving at velocity ##v=20 m/s##. The displacement of one end of the rope is given by $$s(t)=0.1 \mathrm{sin}(6 t)$$ a) Find the wavefunction ##\xi(x,t)##, knowing that it is progressive b) Find the distance ##\delta## (in...
37. ### Strain of a Cantilever beam

Hi, Well i have a system with a excited (in y axis) cantilever beam. I struggling to obtain a expression that gives the strain based on the dislocation y. I know that the displacement of the beam is given by: Ya=PL^3/(3EI) but how i make a correlation between this and the strain of the...
38. ### Physics displacement velocity mass elastic/inelastic help!

NO TEMPLATE BECAUSE THREAD WAS STARTED IN WRONG FORUM A wrecking ball is a heavy steel ball, usually hung from a crane that is used for demolishing large buildings. Suppose we had a crane with a wrecking ball with a mass of m1 = 12,000 lbs. The crane produces a displacement on the ball of a...
39. ### Total distance covered .

Homework Statement The displacement vector of a particle of mass 50 gm. is given as a function in time (t) by the relation ##\vec S##=(5t-t2) ##\hat c## where ##\hat c## is a constant unit vector , s is measured in centimetre and t in second .Knowing that the particle started its motion at t=0...
40. ### Calculating Displacement

Homework Statement I'm just confused about this. I know that displacement=df-di, but using that formula didn't give me the correct displacement in this case. In a 100m sprint, a runner starts from rest and accellerates to 9.6m/s[W] in 4.2 seconds. The runner runs at a constant velocity for...
41. ### Displacement and Vectors

Homework Statement A novice golfer on the green takes three strokes to sink the ball. The successive displacements of the ball are 4.00 m to the north, 2.00 m northeast, and 1.00 m at 30.0° west of south (Fig. P3.21). Starting at the same initial point, an expert golfer could make the hole in...
42. ### Calculating Displacement

Homework Statement A person on a bus walks to the front of the bus at 3.0 km/h relative to the bus, while the bus travels south at 15km/h. What is the passenger's total displacement? Homework Equations displacement= final position-initial position total displacement=displacement1+displacement2...
43. ### Calculating Displacement

If you're calculating displacement using delta d=df-di, do you make one position positive and one negative and then add? For example, if your first position was 23m[W] and the final position was 34 m [E], would you just do, 34- (-23), making the position that is west negative and the east...
44. ### Average velocity? Average speed?

Homework Statement A cow runs in a straight line, moving 108 m east in 16.4 seconds. It then turns and runs 93 m north in 7.64 seconds. a) What was the cow's average speed over the whole trip? b) What was the cow's average velocity over the whole trip? Homework Equations average speed =...
45. ### Displacement gradient same as strain?

Hi, is displacement gradient du/dx same as strain? i though it would be until someone made a comment that they are not the same thing and now I am confused.
46. ### Velocity with negative acceleration!

Homework Statement Train goes 20 m/s Brakes cause a = -1 m/s2 Displacement at t = 40s ? Homework Equations v = 20 m/s a = -1 m/s2 t = 40s The Attempt at a Solution image upload no limit It seemed like this formula fit perfectly. It had all of the known variables and the one unknown neatly...
47. ### Tricky velocity/time problem without distance

Homework Statement A person takes a trip, driving with a constant speed of 89.5 km/h, except for a 22-min rest stop. If the person's average speed is 77.8 km/h a) How much time is spent on the trip? b) How far does the person travel? Homework Equations v1 = 89.5 km/h -> t v2 = 0 km/h...
48. ### It's a work and energy question

1. The problem statement, all variables and given/known force F = (4x i + 3y j) acts on object as it moves in the x direction from the origin to x=5m. What is the angle between the force and the displacement Homework Equations I'm not really sure since I have no idea The Attempt at a Solution...
49. ### Finding displacement and time from velocity and acceleration

Homework Statement He decelerates uniformly at a rate of -5.00m/s^2 over from a velocity of 7.5m/s to rest. Find the time and displacement. Homework Equations Vf^2=Vo^2 + 2a(displacement) The Attempt at a Solution 0=56.25+2(-5)x is this the right way to find displacement? Solving for the x...
50. ### 2 Questions about motion in 1 direction

So I have 2 questions to answer for my physics class and I'm not quite sure what to do. Here are the two questions and I was wondering if someone could possibly point me in the right direction. I'm not asking for the answers I just kind of want a rough idea of where to start. Thank you 1. An...