Displacement Definition and 999 Threads

Homework Statement Today, I got a handout of one problem related to acceleration and position. The problem states. If the relation of x=0.5*g*t^2 is given, what can you tell about the acceleration of the object? (single choice. the problem set is one of the following is right) 1)...

Homework Statement A 4000 elevator breaks off and falls from rest 12 ft above the surface of a relaxed spring. The elevator has a safety system so that the elevator will always experience a frictional force with a constant magnitude of 1000 lb. The spring constant k is equal to 10 000...

I am trying to figure out the displacement from this question: A particle of charge 12x10^-6 C and mass 3.8x10^-5 kg is released from rest in a region where there is a constant electric field of 480 N/C. What is the displacement of the particle after a time of 1.6x10^-2 s. I have tried...

Homework Statement A car is driven east for a distance of 43 km, then north for 29 km, and then in a direction 29° east of north for 24 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...

Hi, just to check which equation for Jd (the displacement current density) is correct: 1) Jd = ε0εr(dE/dt), or 2) Jd = ε0(εr-1)(dE/dt) 1) came from the fact that Jd = ε(dE/dt) and ε=ε0εr 2) came from differentiating P = ε0(εr-1)E (since Jd=dP/dt). It's only a minor thing but in a...

Homework Statement An insect crawls along the edge of a rectangular swimming pool of length 27 m and width 21 m. If it crawls from corner A to corner B in 30 minutes, (a) what is the average speed, and (b) what is the magnitude of its average velocity?Homework Equations average speed =...

Coin--vertical displacement question and other Homework Statement A Perfectly hemispherical dome with a 10. meter radius is treated with a frictionless coating. A marble and a coin are released from the top of the dome simultaneously. We will assume there is no air friction. The coin will...

In Simple harmonic motion: Acceleration = -W^2 x (W being omega, rads per sec. and x beind displacement (distance if you will) ) Omega is a constant but why is acceleration proportional to the NEGATIVE displacement, in other words, why MINUS?? Help appreciated. Thanks in advance!

Homework Statement A ball is thrown at 60 degrees above x-axis. It remains in the air for 2.9 seconds. What is the final displacement in the x (range) if the ball was thrown with the same initial velocity, but at an angle of 45 degrees above x-axis instead? Homework Equations y = (Voy *...

Homework Statement Guys I urgently need help with this question I hfound online. I cannot paste it here because it has all these diagrams which cannot be copied. Could you please just follow the link and tell how best to figure out the question( its the question number 36) The one about the...

Homework Statement A map suggests that Atlanta is 728 mi in a direction of 4.80° north of east from Dallas. The same map shows that Chicago is 561 miles in a direction of 20.8° west of north from Atlanta. Modeling the Earth as flat, use this information to find the displacement from Dallas to...

While John is traveling along a straight inter- state highway, he notices that the mile marker reads 236 km. John travels until he reaches the 140 km marker and then retraces his path to the 173 km marker. What is John’s resultant displacement from the 236 km marker? Answer in units of...

Any one can help me solving this pleasezzzz http://i49.tinypic.com/2vkm2r8.jpg" My attempt At A-B There is No load so dM/dP= 0 and dU/dP= 0 At B-C M = -px - wx.x/2 dM/dP= -x dU/dP = Wx^4/8EI At C-D M = -Wb + Px dM/dP = x dM/dP = -Wbx^2/ 2EI When i include all vaues...

The purpose is to investigate the relationship between the cylinder diameter and the range of motion of a piston in a hydraulic system. The teacher didn't give any initial of final position at all, so I think the teacher means in general. Homework Statement What is the displacement of the...

A sound wave can be interpreted in any of four ways. Two of those involve the correspondence between (1)displacement and position and (2)pressure and position. [By "position" here I refer to the distance from the source. Positive refers to going away from the source.] These waves are 90...

Any of you HVAC guys/gals design a Displacement Ventilation (DV) system in the Northeast USA? With our heating requirements as a notable concern, is DV a viable option for very many applications in the NE USA (DE, NJ, PA areas). It looks interesting to me especially for cooling, but I...

Homework Statement the minute hand of a wall clock measures 10 cm from its tip to the axis about which it rotates. the magnitude and angle of the displacement of the tip are to be determined for three time intervals. what are a) magnitude and b) angle from a quarter after the hour to half...

Hello I have a question, I haven't got my books with me.. So hope you can help me.. I have a crane system like this: http://dl.dropbox.com/u/559096/column.jpg If the column have the boundary: Fixed-Free. Is there a easy way to calculate the maximum displacement? (in the top)

I am completely and totally lost... Homework Statement The motion of an object is simple harmonic with equation of motion x = (27.1 m) sin(16.0 t /s + 0.7). At what time after t = 0 will the displacement reach its first maximum (where velocity equals zero)? Homework Equations x = Asin(wt)

I calculated, using Newton's formula F = GmM/r^2, that the gravitational attraction between two large, full oil tankers whose sides are touching would be 1,331 lb., given the mass of each ship as 6.5 x 10^8 kg, distance between their CG's of 69 m, G = 6.674 x 10^-11 N(m/kg)^2, and 1 N = 0.2248...

A 1 Kg object is dropped from rest from a helicopter at an altitude of 2000 meters. What is the velocity of the object just before it lands upon a thick bed of pillows? The top of the pillow stack is at zero altitude. If the restoring force constant (spring constant) of the stack of pillows is...

The function v(t) = 9 - t2 is the velocity in m/sec for a particle moving along the x-axis, where t is measured in seconds (t is greater than or equal to 0). Use analytic methods to solve: (a) When the particle is moving to the right, to the left, and stopped. (b) The particles displacement...

How can we proved that the infinitesimal angular displacement is a vector mathematically ? Or~how can we prove that a non-infinitesimal angular displacement is not a vector ?

1. A 0.69 kg block is hung from and stretches a spring that is attached to the ceiling. A second block is attached to the first one, and the amount that the spring stretches from its unstrained length increases by a factor of 5. What is the mass of the second block? 2. Force= spring...

A question:Simple harmonic motion http://capa2.cc.huji.ac.il/res/msu/physicslib/msuphysicslib/09_Force_and_Motion/graphics/prob07_twospring.gif1.[/URL] Homework Statement Two springs with spring constants k1=29.7 N/m and k2=20.7 N/m are connected as shown in the figure: Find the...

Homework Statement The displacement (in meters) of a wave is y = 0.13 sin(t - 3.82x), where t is in seconds and X is in meters. (a) Is this wave traveling in the +x or -x direction? 1.+x direction. 2.-x direction (b) What is the displacement y when t = 26.5 s and x = 6.4 m...

Is there really a magnetic field around a capacitors (parallel plate) in vacuum dielectric fed by a variable voltage? Is there an experiment that can prove that we don't need actually a moving electrical charge to create a magnetic field, but a variable electric field in vacuum its enough?

A uniform bar of length "l" and mass "m" is supported at its ends by two springs. One spring has twice the stiffness of the other. From the equilibrium position the centre of the bar is pulled down a short distance and then released. How do you calculate the displacement "s" of the centre of...

Homework Statement 20m 52deg W of N Homework Equations trig functions The Attempt at a Solution I got 20cos52=12.3m west and 20sin52=15.8m north yet the answer in the book says 12.3m north and 15.8m west. I don't understand...I thought cos was the x component and sin was the...

Homework Statement When a carpenter shuts off his circular saw, the 10.0-inch diameter blade slows from 4440 rpm to zero in 2.5 s. A.What is the angular acceleration of the blade? In rev/sec2 B.What is the distance traveled by a point on the rim of the blade during the deceleration? In feet...

Homework Statement A 1.86 g piston is attached to a rotating disc. The radius is 25.5 cm when the disc is stationary. A spring attached to the piston has a spring constant of 31.3 N/m. The piston is rotating at a frequency of 10 Hz. How har will the piston move outward k = 31.3 r = 25.5 cm...

Homework Statement I am asked to provide an anti vibrational support mount for equipment mounted on turbo-prop aircraft. The equipment has a mass of 40kg. the vibrational response of the equipment to the environmental disturbances will need ot satisfy a safety limit prescribed by the...

Homework Statement A flight attendant pulls her 73.8 N flight bag a distance of 306 m along a level airport floor at a constant velocity. The force she exerts is 42.4 N at an angle of 60.1◦ above the horizon- tal. a) Find the work she does on the flight bag. Answer in units of J.Homework...

acceleration and displacement question? a turtle is moving with a constant acceleration along a straight ditch. a person starts a stopwatch as the turtle passes a fence post and notes that it takes him 10s to reach a pine tree 10m farther along a ditch. as the turtle passes the pine tree, his...

Assume a raindrop falls from the clouds and the mass increases as it falls and the increase in mass is 3kg/m. Neglecting any frictional force, find the acceleration in terms of velocity and displacement. Initially when t=0 assume mass is negligible. I just want to ask if we were to neglect...

Homework Statement A car is traveling at 120km/h when it slams on the brakes. How long is the skid mark if the coefficient of friction is 0.62?(hint: convert km/h to m/s) Given: initial velocity: 33.3m/s; final velocity: 0m/s; coefficient of fricition: 0.62 Homework Equations μ =...

Homework Statement Give the following answer in terms of the amplitude, A. At what displacement from equilibrium is the energy of a Simple Harmonic Oscillator two-thirds KE and one-third PE? Homework Equations I would guess PE=.5(k)(x)^2 KE=.5(m)(v)^2 E=.5(k)(x)^2 + .5(m)(v)^2 If one...

Homework Statement A thin rod of length 1.4m and mass .2kg is suspended freely from one end. It is pulled to one side and then allowed to swing like a pendulum, passing through its lowest position with angular speed 7.84 rad/s. Neglecting friction and air resistance, find how far above that...

I have a few problems that I am very confused on. If someone could walk me through them that would be a big help. 1. An antique spring-driven Victrola phonograph plays recordings at 78 rpm. At the end of each record the arm hits a lever that activates a brake that brings the record to rest...

Homework Statement A 15-centimeter pendulum moves according to the equation: theta=0.2cos8t where theta is the angular displacement from the vertical in radians and t is the time in seconds. Determine the maximum angular displacement and the rate of change of theta when t=3 seconds...

Homework Statement A 15-centimeter pendulum moves according to the equation: theta=0.2cos8t where theta is the angular displacement from the vertical in radians and t is the time in seconds. Determine the maximum angular displacement and the rate of change of theta when t=3 seconds...

[b]1. The problem statement Consider the electron and the force on the electron is F=Cxj, where C is a positive constant. F, xj are vector? Homework Equations Consider the electron and the force on the electron is F=Cxj, where C is a positive constant. (F, xj are vectors) a) The electron...

1. Homework Statement [/b] A block with mass (m) is attached to an ideal spring that has force constant (k) . 2. Homework Equations [/b] a.)The block moves from (x_1) to (x_2) , where (x_2) > (x_1) . How much work does the spring force do during this displacement? b.The block moves...

1. An exhausted bicyclist pedals somewhat erratically, so that the angular velocity of his tires follows the equation omega(t) = 0.5t - 0.25sin(2t), t greater than/equal to zero. where t represents time (measured in seconds). 2. omega is defined as the first derivative of...

How would I find the direction in degrees of average velocity in a problem where I have calculated displacement to be 1.65 km at 25° north of west and the average velocity to be .55km/h?

Homework Statement A bird watcher meanders through the woods, walking 0.30 km due east, 0.65 km due south, and 2.25 km in a direction 37.0° north of west. The time required for this trip is 3.00 h. Determine the magnitude and direction (relative to due west) of the bird watcher's (a)...

Homework Statement A box is given a push so that it slides across the floor. How far will it go, given that the coefficient of kinetic friction is 0.20 and the push imparts an initial speed of 4.0m/s^2? Homework Equations F(net)=ma will be used, but to find "a," we need the...

Homework Statement In a total time of 2.0 min, a duck on a pond paddles 22 m [36 degrees N of E] and then paddles another 65 m [E 25 degrees S] Determine the duck's i) total distance travelled ii) average speed iii) total displacement iv) average velocity Homework Equations ii) v=...

Does anyone know how to solve or at least how to begin solving the following problem?: Prove that displacement current in the Maxwell equations can be neglected if characteristic time τ of changing electromagnetic field in the system satisfies to the following condition: τ >> L/c where L is...