Displacement Definition and 999 Threads

i'm having trouble finding good references for lithiating a terminal alkyne and reacting that acetylide with a tosylate, and my goto procedure didn't work. can anyone give me a hand? procedure i did try: alkyne in THF at -78 1.0 eq nBuLi added 1.0 eq tosylated phenylethanol added (color...

Homework Statement What is the total displacement of the graph? (see the picture) The answer is 14m. Can you please show me how to do it? Thank you for your help! :D

I luckily went on to Newton's laws which I already know. I was stuck with a fantastic question ( I have been seeing the Newton's laws from my childhood, but I didn't notice these sort of observation ) . I was seeing the Force and Momentum. Force is based upon acceleration and Momentum on...

Homework Statement An angular displacement θ radians in time t seconds is given by the equation θ = sin 3t. Find a:) angular velocity when t = 1 second b:) the smallest positive value of t for which the angular velocity is 2rad/s c:) the angular acceleration when t = 0.5 seconds d:) the...

My book says that the total vector displacement around a closed loop is zero. Is this a general thing for every type of closed loop? If so, should this be obvious?

Homework Statement Consider an elastic string of length L whose ends are held fixed. The string is set in motion with no initial velocity from an initial position u(x, 0) = f (x). Assume that the parameter alpha = 1. Find the displacement u(x,t) for the given initial position f(x) The Attempt...

Homework Statement A car is driven east for a distance of 48 km, then north for 25 km, and then in a direction 33° east of north for 29 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...

Homework Statement A light ray is incident on a flat piece of glass with index of refraction n. Show that if the incident angle θ is small, the emerging ray is displaced a distance d = tθ(n - 1)/n form the incident ray, where t is the thickness of the glass and θ is in radians. Homework...

I want to show that the energy displacement of Z^{2n}(r), the 2n-dimensional cylinder with radial radius is at most \pi r^2. In the textbook of Mcduff and Salamon they write that I should identify the two dimensional ball (with radius r) with a square of the same area, and then calculate...

SHM - VERTICAL Surely whether you consider the motion used to establish the SHM system, or the motion as soon as the system is released you should derive the same equation. DISPLACEMENT BELOW EQUILLBRIUM. However, consider a verticle spring with particle attached hanging in equilibrium...

Homework Statement A1. An object undergoing circular motion is pictured below at time t = 0 s. (a) What is the angular frequency of the object? (b) What is the equation of the displacement of the object in the x-direction? (c) What is the equation of the displacement of the object in the...

Homework Statement Now consider a specific example where this boundary lies in the plane y = 0 and we have ϵ1 = 4, ϵ2 = 5 and σ = 5C/m2. The electric field in region 1 (with y > 0) is given by ⃗ E1 = (20,−10, 15) V/m. Find ⃗D1. [1] Find ⃗D 2 and ⃗ E2 in region 2 with y < 0. [4]...

Now it's known that waves can't cause the displacement of an object but i made a few experiments that proves it can. For example , wind can cause a wave the can move a piece of paper. However, a water wave can't cause the displacement of and object but other waves like wind can cause that waves...

Hi, I've taken introductory calculus and am doing algebra based physics, but I'm trying to understand how to relate calculus to physics. This is more of a theoretical question than a practical one, so I might be rambling on about something that doesn't even work. I know that W=∫F(d)Δd, but...

Homework Statement "A body is thrown downward with an initial speed of 20 m/s on Earth. What is the time required to fall 300 m?" I tried finding kinetic and gravitational energy, but then I realized I don't have any mass to use it with (1/2)*m*v^2 and m*g*h How can I solve this problem...

Homework Statement An object of mass m is suspended from a vertical spring of force constant 1800 N/m. When the object is pulled down 2.50 cm from equilibrium and released from rest, the object oscillates at 5.500 Hz. a) Find m, b) Find the amount the spring is stretched from its unstressed...

1. A pitcher throws a curveball that reaches the catcher in .60s. The ball is spinning at an average angular velocity of 330 rev/min, (assumed constant) on the path to the catcher's mitt. Find angular displacement. 2. θ=ωt where t is time, ω is angular velocity, and θ is angular displacement...

I really have no idea where to start with this. I have a=\frac{2.071\cdot10^{11}A}{mx^{2}} m/s2, where A and m are constants. Since the acceleration is dependent on position, and the position is obviously dependent on acceleration, I don't know how to separate the two in order to do any...

I am unsure about the virtual displacement and work definition even after looking through the definition and seeming to understand it. If we have ## \delta W = \displaystyle \sum_{i} \vec{F}_i \cdot \delta \vec{r}_i ##, I can use, ## \delta \vec{r}_i = \sum_{i} \frac{\partial...

Homework Statement The graph shows the behavior of an object with the moment of inertia of 18 kgm^2 a) Calculate the magnitude of the constant torque that acted on the system. b) Through what angle did the object rotate between t=2 and t=20 seconds? Homework Equations...

Homework Statement A two-component beam of light, consisting only of two wavelengths 650 nm and 520 nm, is used to obtain interference fringes in a double-slit experiment. The separation between the centers of the slits is 2.43×10−4 m and the distance of the plane of the slits from the...

Homework Statement A large ball bearing is suspended as a pendulum. One end of the pendulum is held by the electromagnet (1) and the ball is initially held by magnet (2) at some height, h, above its lowest position. The ball is released from (2) and as the pendulum swings through the vertical...

couple question regarding buyoancy and water displacment 1. so if you have a pond w/ ρ=1.2 and part of the water in that pond turns into ice will the level decrease increase stay the same? (i think it will stay the same) 2. same pond w/ a ρ=1.2 and you add ice cubes w/ a ρ= 1.2 the cubes...

Homework Statement A boy kicks a ball into the air. It takes 4.3 seconds to land 41.1 meters from his position to the right. What is the launch velocity and launch angle of the ball? Ignore air resistance. Δx = 41.1 m t = 4.3 s a = -9.8 m/s2Homework Equations dx = vxt vfy = v0y + at The...

Hello, I'm trying to figure out a way to do an integral of a speed/velocity function v(x) described as a function of displacement (the speed changes based on the position of the particle). I want to know the distance traveled after a specific period of time, and I can't figure out how to...

Homework Statement y=0.2msin[(0.18rad/m)x+(90 rad/s)t - pi/4] What is the displacement at position x=0 and t=0? Homework Equations y(x,t)=Asin(kx-wt+phi) The Attempt at a Solution y=0.2m[0.18-90]=-0.199m the answer is -.141 m help?

Homework Statement In the attachment! The Attempt at a Solution My big hangup in this situation is why T, the period, of the oscillation doesn't change? If you increase the displacement by 2A does this mean that since the force acting on the spring also increases proportionally there's...

Homework Statement A mass "m" is oscillating on a spring in one direction. And the mass has a dampening constant ψ. The right end of the spring is attached to the mass, and the left end is driven by a force. For t<0, the spring end is at rest, but for t>0 the end oscillates with amplitude...

Homework Statement Find Δx Given: Fxe-(t/T) v0=-41.2 m/s tf=84.54 s T=46 s Fx=13.4 N m=8.8 kg Homework Equations F=ma The Attempt at a Solution a=Fxe-(t/T)/m dv/dt=Fxe-(t/T)/m *integrate both sides* v=[(-T)Fx)/m]e-(t/T)+v0 dx/dt=[(-T)Fx/m]e-(t/T)+v0 *take the...

Hi guys, i'd really like to understand physics but for some reason I'm not coping. Not sure if it's the calculations or something. But I'm willing to learn, I'd appreciate some help with this problem:Homework Statement A B string on a guitar with a length of 33cm is held fixed at both ends...

Homework Statement We were assigned bookwork, we have a test on thursday, and I really don't understand the concepts of the lesson or what we are suppose to be doing. (My teacher is not the best by any standards.) Anyhow, here is the problem. " A 50.0 kg diver steps off a diving board and...

Homework Statement using a map, measure the displacement from Bradford to Milton. Compare the distances traveled to the for each route above with this displacement and explain the differences Homework Equations Δd = vΔt The Attempt at a Solution okay, so i may just being having a brain fart...

Homework Statement In an oscilloscope, an electron is accelerated from rest through a voltage of 1.14x103 V. It then passes through deflecting plates 2.00 cm apart, across which there is a voltage of 412 V. Its velocity when it enters the plates is perpendicular to the electric field of the...

I have a velocity field that is static in time. At every location, x, there is a corresponding velocity vector. I'm trying to work out the displacement of a particle after T seconds if I drop it into the velocity field at time t=0 and at location x_0. I was thinking something along the lines...

Homework Statement A force F = 8i-3i N acts on a particle that undergoes a displacement Δr = 2i + j m. (b) What is the angle between F and Δr? (state your answer to three significant figures) Homework Equations Angle = cos-1 (A.B/ AB) The Attempt at a Solution W=13.1 J AB=...

Mod node: This thread was split from this other thread, 590162. Hey vkash. This is a good one. See, instantaneous angular displacement is a vector. Average angular displacement is not a vector.What does this information tell you about instantaneous angular velocity and acceleration...

Got to calculate the superposition of a couple o' waves, wanted to double check if they are both the same frequency and wavenumber?x1(t) = 3 sin(2∏t + ∏/4 ) and x2(t) = 3 cos(2∏t). I take it 2∏ is the frequency? And since Kx is not inside the function how can I know whether the wave numbers...

Homework Statement An electron moving horizontally at 2.50 x 106 m/s enters a 150 N/C electric field exactly half way between two horizontal parallel plates and follows a parabolic path downwards. Both plates are 14 cm long and spaced 10 cm apart. Determine the vertical displacement of the e-...

Homework Statement A 15.0 kg toy cart is traveling at 5.5 m/s to the right when it collides head on with a 10.0 kg cart traveling at 4.0 m/s to the left. The objects collide and stick togethere. The coefficient of friction between the wheels of the cart and the floor is 0.40. How far will the...

Homework Statement A particle's position is described by x=2t^3-4t-5 Find its a) displacement b) distance from t=0 to t=5 Homework Equations The Attempt at a Solution Displacement, plug in x(5)-x(0) = 230m Distance, shouldn't it be the same thing plug in and get 230m? But...

I have a few questions I thought I'd post together instead of making separate threads, hope that's ok. They are more or less unrelated... 1. Are there 2 conceptual ideas that use the term "virtual work"? I am familiar with the one from intro level physics, but I read there is also one from...

Hello, I've been staring at this question for an hour with no luck.. if anyone could point me in the right direction that would greatly appreciated! Homework Statement a = acceleration v = velocity x = displacement m and n are constants vt = terminal velocity Show that after...

Hi, I assume that you all know the water displacement theory where: The volume of water displaced is equal to volume of completely submerged object. Now, my questions is this: does this theory work for other liquids besides water (e.g. mercury, seawater)? If not, then can you please...

I get the proof with the velocity as a function of time graphic. I don't get why that is... E.G. Why does something with a constant acceleration of (1m/s)/s gets displaced the same as something with a constant velocity of .5m/s?

Homework Statement A mass m is attached to a horizontal spring of spring constant k. The spring oscillates in simple harmonic motion with amplitude A. Answer the following in terms of A. At what displacement from equilibrium is the speed half of the maximum value? Homework Equations PE1 +...

Homework Statement A particle has a linearly varying rectilinear acceleration of a=x''i=(12t)i m/s^2. Two observations of the particle's motion are made: Its velocity at t = 1s is x'i=2i m/s, and its position at t= 2s is given bt xi=3i m. (a) Find the displacement of the particle at t=5s...

I think we can't have a negative displacement. Is that right? Acceleration: the change in displacement / change in time squared Since displacement can't be negative, and time can't be negative, acceleration also can't be negative. But I know (it's in the books) that when we have decreasing...

I'm having a little trouble wrapping my head around the idea of electric displacement fields, it doesn't fit in with any the intuition I gained from lower devision E&M. Are there any lectures online dealing with the subject? Or textbooks that do a particularly good job of explaining? (My class...

Hello all I am trying to measure material displacement using measured thermal data.7 While the specimen is heated up, I want to measure how much it changes its length at particular points. Is this possible? If you have any further questions or suggestions please do not hesitate to...

using d=vit+ 1/2at^2 my subs are 75 =3t +1/2 (9.81)t^2 (if an object is dropped is gravity still -9.81?) where do i go from here