Elastic Definition and 1000 Threads

Homework Statement .5kg bomb sliding west frictionless pond at 2 m/s. after explosion .2kg piece moves south at 4.m/s what are the components of the .3 kg piece.Homework Equations I attempted to use mv1cos+mv2cos=2mvf mv1sin -mv2 sin=2mvf The Attempt at a...

Homework Statement The Gibbs free energy of an elastic band satisfied dG = -SdT - LdF where F is the tension and L the string's length. At fixed temp the entropy is given by S = So - a(L-Lo)^2 + b(L-Lo)^2 Where Lo is the length of the elastic at zero tension and a and b are positive...

Homework Statement I am trying to write (for my own interest) a program in C that solves a simple 1-dimensional physics problem. I want the program to determine the times (after t=0) of the first ten collisions for two elastic balls constrained between elastic walls at x=0 and x=a. The user...

I've recently been looking for information on how to describe elastic and inelastic collisions in a way that spans the full set of possibility of different levels of elasticity between objects. In both of my physics textbooks I was only able to find quantified information on the two extremes...

Homework Statement An ore car of mass 4000 kg rolls downhill on tracks from a mine. At the end of the tracks, at 10 m elevation lower is a spring with k = 400,000 N/m. How much is the spring compressed in stopping the ore car? Ignore friction. Homework Equations First of all, I don't...

Homework Statement A force of 5.00 N compresses a spring 5.00 cm. What is the elastic potential energy stored in the compressed spring? Homework Equations Ep=1/2kx2 The Attempt at a Solution Epelastic needs to calculated. I really do not know how to get there. K=f/x k=5N/ 0.05m...

Homework Statement A 2.20 kg object vibrates at the end of a horizontal spring whose force constant is 320 N/m. What is its period of vibration? Homework Equations Ep=1/2kx2 The Attempt at a Solution I don't even know where to start

Homework Statement A 100 g ball bounces off a wall elastically. Its initial speed is 3 m/s perpendicular to the wall. If the collision lasts for 10 ms, what is the average force exerted by the wall on the ball? Homework Equations F=ma Conservation of energy & momentum (?) F=dP/dt...

Hello, consider a 1D elastic wave which have the amplitude: A=cos(x) What is the energy density: \frac{dE}{dx} of this wave? I seem to recall that the energy of a wave is proportional to the square of the amplitude: E \propto A^2 That seem to mean that \frac{dE}{dx} \propto cos(x)^2...

Homework Statement here is a picture of the problems I am having trouble with: http://oi55.tinypic.com/2llca50.jpg or if that doesn't work: http://tinypic.com/view.php?pic=2llca50&s=7 Homework Equations for question 1: part 1: p1 + p2 = p`1 + p`2 and Distance=Time*Speed part 2: W(f)...

Hi, In electron, neutron or photon diffraction from an atom,what does it mean when we say the waves scatter elastically from the atoms? What is an elastic scattering? Thanks,

Homework Statement A steel ball with a velocity of 2.7 m/s collides elastically with an identical stationary steel ball, and ends up going at a 40. degree angle with its original path. What is the direction of the other ball? What is the final velocity of each? Homework Equations...

Homework Statement 1) A rifle shoots a spring of mass 0.008kg and with a spring constant of 350 N/m. You wish to hit a target horizontally a distance of 15 m away by pointing the rifle at 45 degrees above the horizontal. How far should you extend the spring in order to reach the target...

Homework Statement A child's toy shoots a rubber dart of mass 7.8g, using a compressed spring with a force constant of 3.5 x 10^2 N/m. The spring is initially compressed 4.5cm. All the elastic potential energy is converted into kinetic energy of the dart. What is the speed of the dart as it...

Homework Statement A small truck is equipped with a rear bumper that has a spring constant of 800,000 N/m. the bumper can be compressed up to 15cm without causing damage to the truck. What is the maximum velocity with which a solid 1000-kg car can collide with the bumper without causing damage...

Homework Statement In an elastic collision, kinetic energy is conserved. That said, I do not have a specific question, but rather a broad, conceptual problem. Consider two similar masses of mass m. m1 approaches m2, with an initial velocity v1i and makes an elastic collision. Under what...

Homework Statement A .1 m ramp is sitting at the edge of a horizontal surface that is 1 m from the ground. One ball is resting at the top of a ramp and another ball is resting at the bottom of the ramp where it is flattened. Each ball has a mass of .05 kg. Ball one is released and hits ball...

Just a quick question, does working in the laboratory frame mean particle 2 will be stationary and thus this can be done more simply?

Homework Statement In a "head dip" bungee jump from a bridge over a river the bungee cord is fastened to the jumper's ankles. The jumper than steps off and falls towards the river until the cord becomes taut. At that point, the cord begins to slow the jumper's decent, until his head just...

Elastic Potential Energy of Elastic Band* Homework Statement A stretched elastic band of mass 0.55 g is released so that its initial velocity is horizontal, and its initial position is 95 cm above the floor. What was the elastic potential energy stored in the stretched band if, when it lands...

Homework Statement I must be overlooking something here. In an elastic collision, both momentum and kinetic energy are conserved, right? The math is not making sense...Homework Equations Momentum is conserved: m_{1}u_{1}+m_{2}u_{2}=m_{1}v_{1} + m_{2}v_{2} and kinetic energy is conserved...

Homework Statement a) Initially, mass one (2.40 kg) has a velocity of 5.70 m/s and mass two (2.20 kg) is at rest. After they collide, mass one emerges at an angle theta = 31.0 degrees. What is the speed of mass one after the collision if the collision is completely elastic? (Note, there are...

Homework Statement Billiard ball with mass 0.155kg moves with a velocity of 12.5m/s towards a stationary billiard ball. Assume they both have identical masses. The first billiard ball moves off at an angle of 29.7° clockwise after hitting the stationary one, with a velocity of 9.56m/s...

Homework Statement A very small mosquito is flying west at 5 m/s, when a very massive dinosaur is going east at 3 m/s charges right into it. If the collision is elastic what is the speed of the mosquito when it bounces off the dinosaur.Homework Equations Ek= 1/2 mv^2 P=mvThe Attempt at a...

A 750- kg car stopped at an intersection is rear-ended by a 1790- kg truck moving with a speed of 16.0 m/s If the car was in neutral and its brakes were off, so that the collision is approximately elastic, find the final speed of the truck. Find the final speed of the car. 256 =...

Homework Statement Q: Two air track gliders of masses 300g, and 200g move towards each other in opposite directions with speeds of 50cm/s and 100cm/s respectively. Take the direction of the more massive glider as positive. If the collision is elastic, find the velocity of each glider AFTER...

Hi guys, just wanted to clear a few things up for myself.. By rearranging the conservation of momentum and conservation of energy equations I think I've shown that a collision that involves the colliding objects moving off together after the collision (like a bullet getting stuck in a...

Homework Statement A neutron of mass m0 collides with an immobile atomic nucleus of carbon of mass m=12m0. Collision is considered central and elastic. how many times does the kinetic energy of neutron decreases during the collision. Homework Equations m=12m0 m0v0=mu-m0u...

Homework Statement A 250 g steel ball and a 500 g steel ball each hang from 3.5-m-long strings. At rest, the balls hang side by side, barely touching. The 250 g ball is pulled to the left until the angle between its string and vertical is 22 degrees The 500 g ball is pulled to a 22 degree...

Homework Statement A satellite with a mass of 252 kg approaches a large planet at a speed vi,1 = 12.3 km/s. The planet is moving at a speed vi,2 = 11.3 km/s in the opposite direction. The satellite partially orbits the planet and then moves away from the planet in a direction opposite to its...

Homework Statement A uniform elastic plank moves due to a constant force F distributed uniformly over the end face. The area of the ned face is S and Young's modulus = E . What is the average strain produced in the direction of force ? Homework Equations E*strain=stress... The...

1. Homework Statement [/b] A neutron (mass 1 u) experiences an elastic head-on collision with a gold nucleus (mass 197 u) that is originally at rest. What percentage of its original kinetic energy does the moving particle lose? Homework Equations Elastic Collision: V1f=...

Homework Statement A ball is dropped straight down onto a wedge that is sitting on top of a frictionless surface. The wedge is at an angle of 45degreees and has a mass of 5.00kg. The ball has a mass of 3.00kg. If the ball collides with the wedge at 4.50m/s, and the collision is instantaneous...

Hi, I'm trying to make a 2d simulation of elastic colliding balls. I have a hard time deriving the motion equations after collision. For each ball i know the speed, the mass and the angle of movement. Can anyone point me in the right direction to find the general equations for this ? I need the...

Homework Statement An a particle of mass 6.6 x 10-27 kg came closest to an atom of lead with a distance of 4.8 x 10-14 m. At what velocity will the a particle rebound directly away if the collision is totally elastic? Mass of the Alpha Particle - 6.6 x 10^-27 kg Alpha particles are...

Homework Statement Two bodies P and Q of different masses on a smooth table are connected by a light elastic string which is stretched. P and Q are then released. Which of the following is of the same magnitude for both P and Q Speed, Acceleration, Momentum, Distance moved. Answer: Momentum...

Homework Statement A HOCKEYPLAYER SKATES AT 7.85 M/S AND HAS A MASS OF 120 KG WHEN HE COLLIDES WITH ANOTHER STAIONARY HOCKEY PLAYER. THE SECOND HOCKEY PLAYER IS NOW MOVING AT 5.67 M/S. FIND THE MASS OF THE SECOND HOCKEY PLAYER AND THE SPEED OF THE FIRST. ASSUME THIS COLLISION IS ELASTIC...

A steel wire diameter 0.50mm and length 1.84m is suspended vertically from a fixed point and used to support a 60N weight hung from the lower end of the wire. The Young modulus for steel is 2.0 x 10^11 N m-2 a) The extension of the wire b) The elastic energy stored in a wire given the...

Homework Statement For a rectangular, uniform wing or beam, where would the location of the elastic axis be relative to the mid-chord position? Also, what's the difference between semi-chord and mid-chord for a uniform rectangular wing? Thanks in advance for any help, Carl

Homework Statement a 5.00g object moving to the right at 20.0cm/s makes an elastic head-on collision with a 10.0g object that is initially at rest. Find the velocity of each object after the collision. Homework Equations p=mv m1v1 +m2v2/m=m1=m2 The Attempt at a Solution I have...

Homework Statement Hi I can't seem to get a diagram for this question. Can anyone help and also please explain the subsequent diagram. This is the question. A particle of mass 0.8kg is attached to the ends of 2 identical light elastic springs of natural length 1.6m and modulus of elasticity...

assuming collisions are elastic... right 5 equal masses, if you displace the first ball then you observe balls 2-4 stationary and 5 moves off with equal speed to the right, as all the momentum and energy is passed to ball 2, ball 1 stops, ball 2 then passes all its momentum and energy to ball...

I'm having some trouble with some homework and I'm hoping someone can help me. PROBLEM: #6. Cart1, with mass m, is initially at rest and is struck by cart2, which has a mass of 336 kg and initial speed of 1.81 m/s. The collision is elastic and after the collision cart2 continues to move in its...

Homework Statement Given a homogenous string of mass M, length L and elasticity k, find the length L' when it's hung by one end in a constant gravity field. Homework Equations Hooke's law. The Attempt at a Solution I don't know how to apply Hooke's law in this situation. Please...

I need the general expression for the lagrangian density of a linear elastic solid. I haven't been able to find this anywhere. Thanks.

Homework Statement A cork ball of mass 100 g at rest is released from a height of 8.5 m above the launch point of a 300 g dart which is projected vertically upwards with an initial velocity of 12 m s–1. Upon impact, the cork ball and the dart stick together. Calculate their velocity...

Homework Statement Let's say I hang a ball mass m from the ceiling and my hand holds another ball mass M in my hand and it is d meter above the hanging ball. I throw the ball up with velocity of v_{1} and as the ball I throw up hits the ball hanging on the ceiling, the ball collides...

Hi everybody, I have just a question about elastic and isotropic constitutive relationship Why does the stress tensor need an indeterminate hydrostatic term for an incompressible material? for both solids and fluids.

Consider a collision between a large and small body (golf club/hockey stick/baseball bat and a ball for example). How is it possible to calculate how much the momentum of parts of the body removed from the collision contact point have an effect on the momentum of the smaller body before it...

Homework Statement A cart with mass 340 g moving on a frictionless linear air track at an initial speed of 1.2 m/s undergoes an elastic collision with an initially stationary cart of unknown mass. After the collision, the first cart continues in its original direction at 0.66 m/s. (a) What is...