Elastic Definition and 1000 Threads

Homework Statement A ball of mass 5.0kg moving at a speed of 5.0m/s has a head on collision with a stationary bal of mass 6.0kg. If the collision were perfectly elastic what would be the speeds of the two balls after the collision? Homework Equations P = mv KE = 0.5mv2 The Attempt at...

Homework Statement Consider a small box of mass m sitting on a wedge with an angle θ and fixed to a spring with a spring constant k and a length in a non-stretched state L. The wedge rotates with an angular velocity ω around the vertical axis. Find the equilibrium position of the box...

Is it to possible to use the special case of elastic collisions in one dimension with bodies that posses different mass. Ordinarily I know that if the body has same mass the velocity of the bodies will simply be exchanged but is the fact also hold for body with different masses? v_1 - v_2 =...

Homework Statement A ball of mass m = 100g , falls at an height of 5,2m and it collides elastically with the floor and comes up again. Find the height h2 (how much the ball has come up), the impulse, the average force if the collision lasts 0,02seconds. Homework Equations The...

Say we shoot a bullet that travels in the theta = 0 direction (we are in spherical coordinates). Say the bullet strikes and sticks to a half-infinite isotropic elastic solid that begins at the theta = 90 degrees plane. Is it true that longitudinal waves generated by the bullets impact will be of...

An "infinitely massive" Ping-Pong paddle moving with a velocity of 20 m/s hits a "massless" Ping-Pong ball at rest. The collision is elastic. What is the velocity of the ball after the collision? i get v2f = (2(infinite mass)/(infinite mass - 0))*20m/s = 40m/s is this correct?? i don't...

Perfectly elastic collisions problems usually involve calculating the final velocities of two masses from their initial momenta. Trying to derive such formula I got a different result, a shorter formula to solve the same problem: Take two masses a and b with their respective initial...

Homework Statement Two carts equipped with spring bumpers on an air track have an elastic collision. The 253-g cart has an initial velocity of 1.80 m/s [N]. The 232-g cart is initially stationary. What is the velocity of each cart after the collision?Homework Equations I know because cart 2 is...

Homework Statement An aluminum wire is 0.850 m long and has a circular cross section of diameter 0.780 mm. Fixed at the top end, the wire supports a 1.20-kg object that swings in a horizontal circle. Determine the angular velocity required to produce a strain of 1.00  10–3. Homework...

Homework Statement I hate when I think I got the whole concept right only to get the answer wrong! I really hope it is a simple mis-calculation but I triple-checked all my work. (a For the elevator of Example 7.9, what is the speed of the elevator after it has moved downward 1.00 m from point...

Homework Statement A 1.20 kg piece of cheese is placed on a vertical spring of negligible mass and force constant k = 1800 N/m that is compressed 15 cm. When the spring is released, how high does the cheese rise from this initial position? (The cheese and the spring are not attached). I looked...

Homework Statement Object 1 with velocity v hits object 2, of same mass at velocity 2. Prove that the angle between them after the collision is equal to 90 degrees. Homework Equations PE inital = PE final KE initial = KE final The Attempt at a Solution P x component m1 x v1 + 0...

Homework Statement A 1 Kg car moving at 2m/s collides elastically with a stationary car. The first car rebounds opposite to the original direction at 1m/s and the second car moves off in the original direction of the first car. A) What is the mass of the 2nd car B) What is the speed of...

Homework Statement A hockey player of mass 8.0x10 kg was skating at a velocity of 7.5 m/s [E] when he accidentally hit a linesman who was just standing on the ice. The mass of the linesma is 9.0x10 kg and his velocity after the collision was 3.0 m/s [N30°E]. a) find the velocity of the hockey...

Homework Statement A spring, having a force constant of 6.0x102 N/m, is held in a vertical position and compressed 0.30m. A 5.0 kg mass is then placed on top of the spring. THe mass is then releases. Neglecting air resistance and the mass of the spring, calculate: a) the velocity of the...

Homework Statement Two identical cars approach each other on a straight road. The red car has a velocity of 40MPH to the left and the green car has a velocity of 80MPH to the right. A spring is attached to the front bumper so that a head-on collision will be elastic. If the maximum indentation...

I am not sure which formula to apply, can anyone help me out? Homework Statement 28. A square copper bar experiences only elastic deformation if it is stressed less than 95MPa. To support a load of 1340kg without exceeding this stress, the minimum square cross-section ( i.e. width of one...

Homework Statement A 1.2 kg spring laboratory cart is held against a wall. The spring constant is 65.0 N/m. The spring is compressed 8.0 cm when held against the wall. What is the compression of the spring when the cart's velocity is 42.0 cm/s? Homework Equations (1/2)mv^2=(1/2)kx^2...

Homework Statement An object of 2kg moving at 3m/s hits a 4 kg stationary object, causing the stationary object to begin moving at 0.5m/s. How fast is the original object now travelling? It is an elastic collision. Homework Equations Not really sure, 1/2mv^2 I presume. The...

This is the equation I'm talking about: PV = nRT So say I had a bit of Ideal Gas in a completely insulated elastic balloon, and I raised a temperature just a little bit. PV = nR(2T) Because this is an elastic balloon, would the volume also double? P(2V) = nR(2T) But what if the...

Calculating maximum heright of Mass 1 after elastic collision? Homework Statement Here is the question: Two blocks are free to slide along the ramp. The bloack of m1 = 5.00kg is released from the position at the top of ramp at height h = 5.00m above the flat part of the track. Protruding...

Homework Statement A horizontal spring, of force constant 12N/m, is mounted at the edge of a lab bench to shoot marbles at targets on the floor 93.0 cm below. A marble of mass 8.3 x 10^-3kg is shot from the spring, which is initially compressed a distance of 4.0 cm. how far does the marble...

Homework Statement A 12kg wad of clay is hurled horizontally at a 100g wooden block initially at rest on a horizontal surface. The clay sticks to the block. After impact, the block slides 7.50m before coming to rest. If the coefficient of friction between the bloack and the surface is .650...

Homework Statement Okay, we have a lab about elastic and inelastic collision, and we have to do it in an air table/spark table that generates dots (can be like ticker tapes). We have to determine Momentum (P and P') and Kinetic Energy (Ek and Ek') Please view my attachment. (' = after...

Hi, I'm doing some research on friction, and I did some tests with 4 different types of floor. Now the first of these four floors is a sport surface (it has a polyurethane top coat), the second one is a floor-tile (with fabric on top), the third one a piece of foam and the fourth a piece of...

Here are 3 problems I have been working on. Any help would be very much appreciated. Thank you in advance! Homework Statement Two inelastic balls are traveling toward each other with velocities -4m/s and 7 m/s and they experience an elastic head on collision a)obtain the velocities...

1. A bumper car with mass m1 = 105 kg is moving to the right with a velocity of v1 = 4 m/s. A second bumper car with mass m2 = 98 kg is moving to the left with a velocity of v2 = -3.8 m/s. The two cars have an elastic collision. Assume the surface is frictionless. 2.Vcm= (m1v1+m2v2)/m1+m2 V1 in...

Homework Statement Two balls with masses m1 and m2 moving on a horizontal table in the same direction but at different speeds collide elastically. Obtain expressions for the position and motion of the centre of mass in terms of the separate positions and motions of the two balls before...

hi experts Is collison of cars on road an inelastic collision? because friction force is present - please help me in this regard.

Hi Experts two cars collide on road - it cannot be elastic collision but will it be a inelastic? and does in real life we can have elastic and inelastic collision.

Question about momentum depending if the collision is elastic or not?? Homework Statement Im writing up a lab, and there is something I can seem to get. Does the change in momentum depend on whether the collision is elastic or not? I know it does, but HOW? For example collision of 2...

i need help with this problem. i have no idea how to do this. A 1.41 kg object is held 1.38 m above a relaxed, massless vertical spring with a force constant of 288 N/m. The object is dropped onto the spring. (a) How far does the object compress the spring? 1 m (b) Repeat part (a), but...

Elastic and Inelastic neutrons scattering..! How I can find the energy lost by the neutron in elastic scattering and inelastic scattering, if we assumed its isotropic scattering in the center of mass?

Elastic and Inelastic neutrons scattering..! How I can find the energy lost by the neutron in elastic scattering and inelastic scattering, if we assumed its isotropic scattering in the center of mass?

Homework Statement So I need to prove that transversly isotropic materials have 5 independent elastic constants. I can prove that an orthotropic material has 9 independent elastic constants. I need to use the transformation matrix to show that some of the 9 mentioned components are equal for...

1. A pendulum bob of mass m is released from a height H above the lowest point. It collides at the lowest point with another pendulum of the same length but with a bob of mass 2m initially at rest. Find the heights to which the bobs rise given that the collision is (A) Completely Inelastic...

Problem: Consider the following scenario: An elastic band is used to suspend a metal cylinder vertically. The cylinder is given an initial downward motion so that it moves down, reaches a low point, and then moves back up again. Your challenge task is to determine the tension in the...

Seems that most of the textbooks are dealing with elastic beam calculations, where a beam is fixed from both ends and initially there is no axial stress or load applied. My problem is different in a way that an elastic rectangular beam is fixed from both ends and it is under certain tensile...

Homework Statement An elastic string with modulus of elasticity=12. Natural length= 0.5m. Mass of ball attached to the end of the string=0.5kg. The other end of the string is fixed at point P. The particle is pulled down until it is 1.5m below P. Find the kinetic energy of the particle...

A stationary object with mass mb is struck head-on by an object with mass ma that is moving initially at speed v0. If the collision is elastic, what percentage of the original energy does each object have after the collision? I don't know how to find percentage.

Hi, I came across this question which i couldn't figure out why the kinetic energy of the table-tennis ball is greater than the bowling ball after collision. Qn: A table-tennis ball is thrown at a stationary bowling ball. The table-tennis ball makes a one-dimensional elastic collision and...

Hi everyone. I would really appreciate if I could get some help with this problem elastic collision problem. I will provide the question and the solution as shown in my textbook. What I would like to know if specifically how they used the equation, V2ix-V1ix = -(V2fx-V1fx), and why they arranged...

Hey everyone, Reviewing material for a technical interview and I have stumbled into some problems that I sadly have issues with. Old review for me :D. Any help would be appreciated. I can follow up through the conservation of energy equation. However at the in an elastic collision...

I'm reading Feynman Lectures on Physics Volume 2 Chapter 39 on elastic materials. Equation 39.22 relates the elements in the elasticity tensor to the Young's modulus and the Poisson's ratio. I have no clue on how to get these relations myself. For example, for C_xxxx, I think it should tell...

In an inelastic collision, it is said that the total KE is not conserved but the total momentum is. When both the momentum and KE are the products of mass and some power of velocity, how total value of one remains constant and the other not. This is very confusing.

Homework Statement A charged particle with mass m = 200g and charge q = 25 µC is suspended from an elastic cord with force constant K = 5 N/m in a vertically upward electric field E of magnitude 3.7 x 10^5 N/C. What is extension of the cord when the particle is in equilibrium? Homework...

Homework Statement Prove that in an elastic collision between two identical bodies, one of which is initially at rest, the angle between their velocities after collision is pi/2, except for the case of central impact. Homework Equations Assume particle 1 travels in the x direction with...

Why does glass get elastic when immersed in HF; like this video? Hi, I was surfing YouTube and came across a very interesting video... Check it out yourself; http://youtu.be/gzUDjHDj0fQ" Why did the glass become elastic? I was thinking it might be due to destruction of some bonds...

Homework Statement A soccer ball with radius R = 11 cm is inflated to a gauge pressure of 9×104 Pa. The ball is dropped onto and bounces elastically off of a hard smooth floor. Find approximate expressions for the surface area of the ball in contact with the floor, the amount of time the ball...

Hi everyone. I believe that I'm in the right place for this topic. If not, please excuse me for the misplacement :) I am a programmer, not a physicist, so please excuse my lack of knowledge. I currently need help with an energy conservation problem. I am currently working on this problem...