Displacement Definition and 999 Threads

Homework Statement a dolphin swims near the sea surface 350m west, then 200m northwest, and then dives below the surface and swims an additional distance in an unknown direction. The final position of the dolphin is 80m directly below the fishing boat located 400m north of the starting point...

Here is the question: I have posted a link there to this topic so the OP can see my work.

My physics teacher has given me a worksheet with several problems involving trigonometry to find a displacement vector from a set of given vectors. Since this is my first year in physics, I feel out of my element and would really appreciate any help or direction given to me on how to go about...

Linear displacement by flexure, spring or ? I'm doing a little project of mine and I have encountered a problem.. The project is basically a motion platform that moves in three directions at very low forces (few mN). I got the first two direction done (X,Y), but the third is giving me...

Homework Statement Two forces, vector F 1 = (4 i hat bold + 6 j hat bold) N and vector F 2 = (4 i hat bold + 8 j hat bold) N, act on a particle of mass 1.90 kg that is initially at rest at coordinates (+1.95 m, -3.95 m). A) What are the components of the particle's velocity at t = 10.3...

The figure below shows a velocity versus time plot for two objects; they are at the same point at t = 0. Homework Statement Do the objects ever have the same displacement? If so, when does that happen? Homework Equations Δd = ((velocityi+ velocityf) / 2) Δt acceleration = change...

Homework Statement A subway train starting from rest leaves a station with a constant acceleration. At the end of 7.8 s, it is moving at 11.778 m/s. What is the train’s displacement in the first 5.6394 s of motion? Answer in units of m Homework Equations a= velocity final - velocity...

https://www.physicsforums.com/attachments/1341 for (i) just did $$16^2+12^2=400$$ so $$\sqrt{400} = 20$$ km but don't know how they got the $$13 \frac{km}{min}$$ there are some more ? on this involving the displacement vectors but want to get this (a) part done first.

Homework Statement A man shoots an arrow 145m/s at 61o from a height of 15m where the ground below is the origin. A.) Where will the arrow be in 1.5 seconds (X,Y)? B.) What will be the displacement when the arrow lands in regards to where it was shot from Homework Equations I...

Homework Statement Question: Provided all else is equal, if a ball is thrown at half the original speed will it travel half as far? Homework Equations Δx = vΔt The Attempt at a Solution In projectile motion, the time of flight will be the same no matter the horizontal...

Homework Statement A train traveling at a velocity of 60.0 m/s is slowed down at a uniform rate of 1.25 m/s2. How far will it travel before its velocity is 1/2 its original value? Homework Equations v2 = vo2 + 2ad The Attempt at a Solution I first need to isolate my variable, so...

Apologies, this is most likely basic to most of you, and there are probably much better ways to go at this than I have. Homework Statement An 8mm wide cone of a hypothetical substance which does not melt, with a mass of 2.7 grams, is shot straight up at a 90 degree angle. Only accounting...

Homework Statement The graph below shows the vertical displacement of an object as a function of time. (a) Construct a graph of the object’s velocity as a function of time. (b) Construct a graph of the object’s acceleration as a function of time. (c) Describe a scenario in which a...

Homework Statement Find the resultant displacement(magnitude and direction of the following vectors: 12.3m North, 45.6m East, 78.9m West, 14.7m South Homework Equations c=sqrt a^2 + b^2 The Attempt at a Solution Do you just add the vectors so the north and south added together...

https://www.physicsforums.com/attachments/1222 there are 5 more questions on this which are more complicated but want to get this (a) first. assume by speed they mean magnitude of the vector. Toyundai speed is $$30 \frac{km}{h} $$ Chryssalt speed is $$\approx 39 \frac{km}{h}$$

Hey guys, so I'm having some trouble, not sure if back of the book is wrong or if I'm doing it wrong, probably me though lol. Alright so I have this graph, http://imageshack.us/photo/my-images/27/wqqf.jpg/It's asking me to find displacement at 10.0s. So I know that displacement = area of a...

Homework Statement The graph is of a runner- time(min) is the x position(x1000 m) is the y these are the points 0,0 10,3 20,3.5 30,4.5 The question is- For the time interval between 10 min and 20 min, what is the runner’s displacement? Answer in units of m Homework...

a man moves in an open field such that after moving 10 m on a straight line he makes a sharp turn of 60 degree to his left .the total displacement after 8 such turns is equal to

Hello, I am a high school student trying to compare two motorcycles on a displacement vs time graph. The information I have is the mass of riders, mass of bikes, gear ratios, tyre circumference and dyno results indicating hp vs rpm. I am not taking air/rolling resistance into consideration...

So I am studying mechanical engineering, and I got into a debate with my (mit mechy) graduate roommate about the possibility of having a net nonzero force which involved no actual displacement of an object. Normally, when an object is accelerated along a direction (given an external force)...

Homework Statement I am having trouble grasping why exactly displacement current and conduction current are sometimes equal to each other and sometimes are not. My textbook states that the displacement current is defined as ε0 * d(EA)/dt. That is, epsilon not times change in electric flux. I...

What are proximal/distal displacements of stents and what is causing it?

Good afternoon all My question is, when we observe stationary waves, and we know that at a certain point, the sound is maximum, is this the displacement node or the displacement antinode? I have read a few different sources and currently i have encountered both. To me it makes more sense...

[b]1. An electron in the cathode ray tube of a television set enters a region where it accelerates uniformly from a speed of 62300 m/s to a speed of 3.86 × 106 m/s in a distance of 3.17 cm. What is its acceleration? [b]2. a = [Vf2 - Vi2] / [2d] [b]3. a = [(3.86 × 106)m/s2 - 62300m/s2]...

Homework Statement If the radius of theCD below is 6.0cm and the angular velocity is 5.0 rad/s , what's is its angular displacement in 2.0s ? Homework Equations Delta θ = ωt+.5∂t^2 The Attempt at a Solution I know the angular velocity and the time but how can I find out the radial...

Faraday's Displacement Flux Experiment: Hi, I am having trouble understanding the experiment...

Hello all I was wondering if someone could help shed some light on a physics problem that I am having difficultly with. I am trying to find displacement of a moving object. The only data I have is acceleration (ms/^2) and time (seconds). The acceleration of the object was measured once...

Homework Statement (this is translated from Italian so it might have some technical mistakes :) ) A target with negligible dimensions is placed at H = 5m from the ground; a vehicle on the ground is moving at a velocity V = 2m/s (the module) and is getting closer to the target. Consider O the...

Homework Statement Frank drives a load of tomatoes 14 km [E], 6 km [N], 12 km [N 15° E] ( East 15 degrees of north ) and then 2 km [N 65° E]. The trip takes 42 minutes. a) Calculate frank's distance and displacement. b) Calculate frank's average speed and average velocity. Homework Equations...

Homework Statement http://answers.yahoo.com/question/index?qid=20120411050123AA0ar9P Homework Equations [b]3. The Attempt at a Solution [/b Only I have one question concerning the answer that "E" provides in the link: why do periods cancel out?

Homework Statement A skidding car starts moving with a velocity of 6.75m/s at an angle of 58.82657 degrees north of east. Its velocity just before it comes out of its skid 4 seconds later is 3.25 m/s at an angle of 49.6091 degrees south of east. It travels with a constant acceleration while it...

I'm trying to fit together my understanding of quantum mechanics, quantum field theory, given my lacking maths education. In quantum mechanics we have a time displacement operator and a space displacement operator, which are respectively: \hat{T}(t) = e^{-i\hat{H}t} \hat{D}(\underline{x}) =...

Homework Statement A frictionless, incline plane at 20 degrees has a spring with force constant k=500N/m attached to the bottom, parallel to the inclined plane. A block of mass m=2.5kg is placed on the plane at a distance d =3m from the spring. From this position the block is projected...

Homework Statement The springs AB and BC have stiffness k and an unstretched length of l. Determine the displacement d of the cord from the wall when a force F is applied to the cord. See Picture attached. Given: l = 3 m k = 600 N/m F = 200 N Homework Equations Fspring= ks s=...

"This figure is a snapshot graph of the instantaneous velocity of the particles on a string. The wave is moving to the left at 50 cm/s. Draw a snapshot graph of the string's displacement at this instant of time." So it seems to be a quite basic question, where it's pretty much just an...

Homework Statement A ball on a porch rolls 60 cm to the porch's edge, drops 40 cm, continues rolling on the grass, and eventually stops 80 cm from the porch's edge. What is the magnitude of the ball's net displacement, in centimeters? ball starts rolling here \/ rolls 60cm-> #----------#...

Homework Statement A ball on a porch rolls 60 cm to the porch's edge, drops 40 cm, continues rolling on the grass, and eventually stops 80 cm from the porch's edge. What is the magnitude of the ball's net displacement, in centimeters? Homework Equations d = a^2 + b^2 The Attempt at a...

Homework Statement Object is oscillates such that displacement is x = (.222)sin(314t), where t is in seconds. In one period, the objects moves what distance? Homework Equations What is the relationship between displacement, amplitude and distance? The Attempt at a Solution The...

I'm having trouble with this problem. I did: FTcosθ-mg= 0, solving for FT, getting FT= mg/cosθ. Then, along the x-axis, F-FTsinθ=0, solving for F, getting F= mgtanθ. Not sure how to go about it from here. What is the direction of the displacement?

Homework Statement Complete the simple displacement reactions and balance any chemical reactions. Homework Equations Pb + NaCl → __________ + ____________ The Attempt at a Solution Pb + NaCl → PbCl + Na But I don't know which charge of lead to use: Pb2+ or Pb4+ to...

Homework Statement Complete the simple displacement reactions and balance any chemical reactions. Homework Equations copper + silver nitrate → __________ + ____________ The Attempt at a Solution Since copper on the periodic table can be Cu2+ or Cu+, my solution was copper + silver...

Homework Statement A ball is thrown to a man and reaches him in 60s. The ball curves because it is spinning at an average angular velocity of 330 rev/min on its way to the man's hands. What is the angular displacement of the ball Homework Equations θ=ωt The Attempt at a Solution I...

For an axisymmetric long tube, it is said that radial displacement is independent of axial coordinate. What is the justification for this simplification?. If u, v and w are axial , tangential and radial displacements then u=u(x,θ,r) v=v(x,θ,r) w=w(x,θ,r) Where x,θ,r are polar coordinates...

I know and fully understand the mathematical definition of it. But what's the physical explanation? Is it something like "preservation of current" or something?

Homework Statement distance = 0.8meters angle = 55° gravity = 9.81m/s^2 \V_0 = ?, assuming that it leaves and falls back on the same horizontal plane. The attempt at a solution So we know for a fact that the initial velocity is supposed to be 2 m/s, according to the book at least. I tried...

In the kinematic equation x = x0 + v0 * t + .5 * a * t^2, can someone give me an example in which x0 has a value that is not zero?

Homework Statement The function x = (4.5 m) cos[(6∏ rad/s)t + ∏/3 rad] gives the simple harmonic motion of a body. At t = 1.6 s, what are the (a) displacement, (b) velocity, (c) acceleration, and (d) phase of the motion? Also, what are the (e) frequency (in Hz) and (f) period of the...

1. A torsional oscillator of rotational inertia 2.1 kg·m2 and torsional constant 3.4 N·m/rad has a total energy of 5.4 J. What is its maximum angular displacement? What is its maximum angular speed? Homework Equations θ(t)=Acosωt The Attempt at a Solution still trying to...

I'm trying to learn some physics on my own, using the internet as my main source of information. Now, I'm a bit confused about some terminology, and I can't find anything about it... Distance vs displacement in rotational kinematics! Is there a similar difference as in linear kinematics...

Hey guys i am very stuck any help appreciated. I do not know where to start. The equations used need to be derived from first principles and accurate free body diagrams drawn. An elevator moves downwards at a constant velocity v0. While descending, at a particular height (assuming t=0), the...