Displacement Definition and 999 Threads

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 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...

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 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. [/color]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...

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[SIZE="1"]∏t + [SIZE="1"]∏/4 ) and x2(t) = 3 cos(2[SIZE="1"]∏t). I take it 2[SIZE="1"]∏ is the frequency? And since Kx is not inside the function...

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

When I want to prevent iron from rusting, I use a more reactive metal such as magnesium and connect it to the iron. This protects iron from being rusted as the magnesium will transfer electrons into the iron when it rusts, thus reducing Fe2O3 into Fe metal. However, Mg will be oxidised to Mg2+...

When a more reactive metal displaces a solid metal oxide, a lot if heat is required for the reaction to occur. However, both metal and metal oxide can be solid for the reaction to take place right?

We can have the velocity as v1 or v2 , time also, but In some cases i see it in displacement for e.x ##x=x_0+v_0 t + \frac{1}{2} at^2##, how can it be displacement 1 , displacement 2, can some one explain? Is it the displacement of the body 1, and displacement of the body 2 or what?

I have a few physics problems I need help with. Please show work or I won't know how to do it. My book has no example problems. 1. Suppose you balance a 5kg ball on the tip of your finger, which has an area of 1 cm^2. Show that the pressure on your finger is 49N/cm^2, which is 490kPa...

Homework Statement Calculate acceleration and velocity of a piston. Stroke is 150mm and engine speed 3500rpm Using simple harmonic motion equations Homework Equations a = -ω^2*s v = ω*√A^2 - s^2 ω = 2*∏*f v = velocity, a =...

Do Wien's displacement law hold true even for bodies with emissivity not equal to 1, that is, non-black bodies?

The problem is attached, stuck on part d. Homework Statement Im given a problem with two horizontal and parallel plates 8cm long 3cm away from each other. An electron is moving through them with a velocity V_{0}. It is also given that the voltage across the plates is 20 Volts and the...

Is it possible for particles of air to be displaced by an organism and as the organism increases in size and mass the higher the displacement?

Homework Statement In a cathode ray tube (CRT) used in older television sets and oscilloscopes, a beam of electrons is steered to different placed on a phosphor screen, which glows at locations hit by electrons. The CRT is evacuated, so there are few gas molecules present for the electrons to...

Homework Statement A person walks in the following pattern: 4.1 km north, then 2.0 km west, and finally 2.5 km south. Homework Equations (a) How far (in km) and (b) at what angle (measured counterclockwise from east) would a bird fly in a straight line from the same starting point to the same...

Homework Statement The angular displacement θ, despite having a magnitude and a direction, cannot be treated as a vector. This is because θ does not follow the commutative law of vector addition. Does the infinitesimal displacement dθ obey the commutative law of addition and hence qualify...

Homework Statement A room has dimensions 3.15 m (height) 3.85 (width) m 4.10 (length) m. A fly starting at one corner flies around, ending up at the diagonally opposite corner. (a) What is the magnitude of its displacement? (solved and got 6.45m) (b) Could the length of its path be less...

Homework Statement A body experiences acceleration "a" given by the expression a=At-Bt^2 where A and B are constants and t is time. If at time t=0, the body has zero displacement and velocity, at what next value of time does the body again have zero displacement?Homework Equations a is in...

A spring cannon is located at the edge of a table that is 1.2 m above the floor. A steel ball is launched from the cannon with speed Vo at 35.0 degrees above the horizontal. (a) Find the horizontal displacement component of the ball tothe point where it lands on the floor as a function of Vo...

Has anyone made a calculation for example, how much (or the mean) time it takes for an individual gas molecule to be displaced a distance of one meter (measured straight) from its original location? For example, air molecule at ambient pressure with a mean free path of 68 nm. That would be...

Difference between "Position Vector" & "Displacement Vector?" (no calculatins..) http://en.wikipedia.org/wiki/Position_(vector ) http://en.wikipedia.org/wiki/Displacement_(vector ) Is the position vector simply an initial vector given by coordinates (x,y) or (x,y,z) such as (8,4) or...

Homework Statement A wolf wanders 64 m [N15E], 93m[N20W], and 167 m [N]. What is her displacement? North to South east is considered positive by my sign convention, and from south to north west, it is considered to be negative, once again by my sign convention. I've never seen problems like...