Elastic Definition and 1000 Threads

A 0.25 kg ball is attached to a 26-cm piece of string. The ball is first raised so that the string is taut and horizontal, then the ball is released so that, at the bottom of its swing, it undergoes an elastic headon collision with a 0.21 -kg ball that is free to roll along a horizontal table...

A proton (mass 1 u) is shot toward an unknown target nucleus at a speed of 2.40×10^6 m/s. The proton rebounds with its speed reduced by 25% while the target nucleus acquires a speed of 3.50×10^5 m/s. What is the mass, in atomic mass units, of the target nucleus? I tried...

Homework Statement A ball is attached to one end of a wire, the other end being fastened to the ceiling. The wire is held horizontal and the ball is released from rest. It swings downward and strikes a block initially at rest on a horizontal frictionless surface. Air resistance is negligible...

Consider a frictionless track ABC as shown in Figure P8.23. A block of mass m1 = 8.00 kg is released from A. It makes a head-on elastic collision at B with a block having a mass of m2 = 14.0 kg that is initially at rest. Calculate the maximum height to which m1 rises after the collision...

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

in a head-on elastic collision between two masses, one of which is stationary, a experimenter would like the incident mass to lose quarter of its kinetic energy in the collision. What must be the ratio of the masses of the two objects for this to be the case?

in a head-on elastic collision between two masses, one of which is stationary, a experimenter would like the incident mass to lose quarter of its kinetic energy in the collision. What must be the ratio of the masses of the two objects for this to be the case?

Homework Statement A proton is traveling to the right at 2.0x10^7 m/s. It has a head on perfectly elastic collision with a carbon atom. The Mass of the Carbon atom is 12 times the mass of the proton. What are the speed and direction of each after collision? Homework Equations...

as I understand it aether theory claims that fields are strain in an elastic medium. the elastic medium can be thought of as a system of springs and masses. (note that the springs store energy proportional to the square of their change in length) I can see how this probably works fine for...

Homework Statement A spring (k=75 N/m) has an equilibrium length of 1 m. The spring is compressed to a length of .5 m and a mass of 2 kg is placed at its free end on a frictionless slope which makes an angle of 41 degrees with respect to the horizontal. The spring is then released. a) If the...

Homework Statement Blocks A (mass 3.50 kg) and B (mass 10.00 kg) move on a frictionless, horizontal surface. Initially, block B is at rest and block A is moving toward it at 9.00 m/s. The blocks are equipped with ideal spring bumpers. The collision is head-on, so all motion before and after...

I'm learning piezoelectricity right now and got an equation I can't understand. It writes the Newton's sencond law for the stresses in materials due to elastic and piezoelectric contribution. The equation is in the attachment. In this equation I'd like to ask what is the partial derivative...

SOLVED Homework Statement Two rock climbers, Bill and Karen, use safety ropes of similar length. Karen's rope is more elastic, called a dynamic rope by climbers. Bill has a static rope, not recommended for safety purposes in pro climbing. Karn falls freely about 2.0m and then the rope stops...

Suppose we have a rubber band of some elasticity k and of unstreched radius r0 (the band is always kept in the shape of a circle). What work is necessary to strech it to some larger radius r? How do we apply Hooke's law in this situation? Thanks

Homework Statement Puck A has a mass of 0.236 kg and is moving along the x-axis with a velocity of 5.56 m/s. It makes a collision with puck B, which has a mass of 0.472 kg and is initially at rest. The collision is not head-on. After the collision, the two pucks fly apart with the angles shown...

In the usual calculaltion of the Compton effect we assume an elastic collision between a photon and an electron. Energy and momentum of the particles are conserved before and after the collision. In fact, the electron is subject to a high acceleration during the collision, and classically it...

I am a bit confused about the definition of elastic collision. What i have studied is, elastic collision is one in which the kinetic energy is conserved. Now, some books also say that elastic collision is one in which both momentum and kinetic energy is conserved. But, is it true that...

A charging elephant with mass 5230kg comes toward you with speed of 4.45m/s. You toss a 0.15 rubber ball at the elephant with a speed of 7.91 m/s. (a) When the ball bounces back toward you, what is the speed? Answer= 16.8 I don't know if the answer is written wrong in the back of the book...

Elastic Glancing Collision-HELP! A white ball, mass of 1 kg has a speed of 1.68 m/s and a yellow ball, mass of 2kg, is at rest prior to an elastic glancing collision. After the collision the white ball has a speed of 1.24 m/s. To the nearest tenth of a degree, measured counterclockwise from...

Homework Statement Kevin has a mass of 89.5 kg and is skating with in-line skates. He sees his 25.50 kg younger brother up ahead standing on the sidewalk, with his back turned. Coming up from behind, he grabs his brother and rolls off at a speed of 2.13 m/s. Ignoring friction, find Kevin's speed...

A 2.40 kg object is hanging from the end of a vertical spring. The spring constant is 41.0 N/m. The object is pulled 0.200 m downward and released from rest. Complete the table below by calculating the translational kinetic energy, the gravitational potential energy, the elastic potential...

Homework Statement In a physics lab a cube slides down a frictionless incline and elastically strikes another cube at the bottom that is only half it's mass. If the incline is 30 cm high and the table is 90 cm off the floor where does each cube land? Homework Equations mgh=1/2mv^2...

Homework Statement a .450kg ice puck moving east with a speed of 3 m/s has a head on collision with a .9 kg puck initially at rest. Assuming a perfectly elastic collision what will be the speed and direction of each object after the collision? Homework Equations v1 +v1f = v2+v2f...

Homework Statement Which of the following is a true statement concerning a comet passing near the sun? (Mass of comet and mass loss are negligible) 1. The momentum of the comet is nearly conserved because the interaction with the sun is similar to an elastic collision. 2. The momentum of...

Homework Statement A positively charged alpha particle is fired, in a direct line, at a positively charged gold nucleus: o--> O o: alpha, O: golden nucleus. Because of their mutual repulsion, the alpha particle does not actually hit the nuleus: it comes to rest, for a...

A glider of mass 0.147 kg is moving to the right on a frictionless, horizontal air track with a speed of 0.720m/s . It has a head-on collision with a glider 0.309 kg that is moving to the left with a speed of 2.26 m/s. Suppose the collision is elastic. Find the magnitude of the final velocity of...

Okay I have been working on this problem forever and I don't know what else to try. Can anyone help me?... A 0.005-kg block is released from rest at the top of a frictionless track 2.50 m above the top of a table. It then collides elastically with a 1.00-kg object that is initially at rest on...

My first post here! I signed up a few minutes to correct someone... then deleted my post when I realized I was on about something entirely different. Ahem. Anyway, have a look at this diagram: http://img2.freeimagehosting.net/uploads/c8911ecf7e.jpg Particle P is suspended on an...

Hello, A very basic question, with a bit of confusion. a ball hitting a wall which is not moving with velocity v in an elastic collision has its momentum conserved, opposite velocity; -v. if the ball is to collide with a wall which has a velocity -v, equal speed towards the ball, what is...

[SOLVED] Elastic collision Homework Statement A proton of mass 'm' collides with a particle of unknown mass at rest. After the collision, the proton and the unknown particle are seen moving at an angle of 90 degrees with respect to each other. What is the mass of the unknown particle. Known...

A slingshot will shoot a 10-g pebble 22.0 straight up. How much potential energy is stored in the slingshot's rubber band? the solution is U = mgy = (10 g)(9.8 m/s^2)(22.0 m) according to the book. does this mean the potential energy of the slingshot's rubber band is equal to the...

[SOLVED] Conservation of momentum + elastic collision Hey guys, I couldn't even start this one, tried to think about it, but I'm hitting a blank A block of mass m = 2.20 [kg] slides down a 30 degrees incline which is 3.60 [m] high. At the bottom, it strikes a block of mass M = 7.00 [kg]...

Homework Statement The only force acting on a 2.4 kg body as it moves along the positive x-axis has an x component Fx = - 6x N, where x is in meters. The velocity of the body at x = 3.0 m is 8.0 m/s. - What is the velocity of the body at x = 4.0 m? Homework Equations W =...

Homework Statement A 110 g ball moving to the right at 4.0 m/s catches up and collides with a 400 g ball that is moving to the right at 1.2 m/s. If the collision is perfectly elastic, what is the speed of the 110 g ball after the collision? Homework Equations KEi=KEf 1/2m1v1i^2 +...

[SOLVED] Elastic Collision/Kinetic Energy Problem Homework Statement A neutron in a reactor makes an elastic head-on collision with the nucleus of a carbon atom initially at rest. (a) What fraction of the neutron's kinetic energy is transferred to the carbon nucleus? (b) If the initial...

Hello people. New here and I've got a problem here which i would appreciate some help with. Situation : A ball of mass 300g is attached to a massless string of 0.2m suspended at a 90 degree angle to another ball of mass 500g held by a massless string at length 0.2m. Imagine the ball A...

[SOLVED] Elastic and Inelastic A 100 g block on a frictionless table is firmly attached to one end of a spring with k = 29 N/m. The other end of the spring is anchored to the wall. A 25 g ball is thrown horizontally toward the block with a speed of 5.9 m/s. Q1: If the collision is perfectly...

A problem I am working on for a project... Force required to hit a golf ball 76.2 m/s Does the impulse assume the collision is perfectly elastic? I am doing a problem on golf... mass of golf ball .0459 kg velocity of ball is 76.2 m/s time of interaction is .0005 seconds coefficient...

Homework Statement A ball of mass 2.5kg is moving to the left along a smooth, horizontal table at 3.5m/s. An idea spring (one that obeys Hooke's Law) with a spring contstant of k=1100N/m, and a relaxed length of 0.3m, is attached to its front. It collides head on with a 4.5 kg ball, initially...

Based on the equation: 1/ktot = 1/k1 + 1/k2 Why is it that the reciprocal of the total spring force is equal to the reciprocals of each spring constants?? I know how to derive the equation, but what is the physics behind it?? The total spring constant is much less than those of the two...

Homework Statement A ball is dropped from a height of 10 meters onto a hard surface so that the collision at the surface may be assumed elastic. Under such conditions the motion of the ball is (A) simple harmonic with a period of about 1.4 s (B) simple harmonic with a period of about 2.8...

Homework Statement A simple harmonic oscillator has a total energy E. a) Determine the kinetic and potential energies when the displacement is one half the amplitude. b) For what value of the displacement does the kinetic energy equal the potential energy? Homework Equations PEs=...

[SOLVED]Elastic Collosions- help please? 1. A tennis ball of mass 57g is held just above a basketball of mass 590g. With their centers aligned, both are relesed from rest at the same moment, to fall 1.2m. a)Find the magnitude of the downward velocity of the basketball as it reaches the ground...

Homework Statement Suppose you hold a small ball of mass m1 in contact with, and directly over, the center of mass of a large ball of mass m2. If you then drop the small ball a short time after dropping the large ball, the small ball rebounds with surprising speed. If we ignore air...

Homework Statement A 61.9kg object moving to the right at 43.3 cm/s overtakes and collides elastically with a second 44.9kg object moving in the same direction at 26.9cm/s Find the velocity of the second object after the collision. Homework Equations My homework says its in the...

Homework Statement A 10-kg mass moving at a speed of V_{1} in a positive direction collides elastically with a 2-kg mass which is initially at rest. The magnitude of the net force that acts on each object during the collision is shown in the figure. Find the initial velocity, V_{1}, of the...

I have calculated the dependence of (1/s11) ie. single-crystal young's modulus on crystallographic direction for an inorganic crystal. I've noticed that certain peaks correspond to closely-packed planes eg. a psedo-hexagonal arrangement is seen in directions where the peaks (ie. local...

Homework Statement A stationary object with mass m[SIZE="1"]b is struck head-on by an object with mass m[SIZE="1"]a that is moving initially at speed v[SIZE="1"]0. If the collision is elastic, what percentage of the original energy does each object have after the collision? KA2/K1 = ...

Homework Statement bloks b and c have m asses 2m and m respecti vely, and are at rest on a firctionless surface black a also of mass m.. is heading at speed v toward block b as show... determine te final velocity of each block after alll subsequent collisions are over, assum all collision are...

When a ball with mass m collide with another ball with equal mass as m=> m1 at rest, the mathematical proof shows that after the collision, the angle between two masses would be 90' I know that when m> m1 , angle <90' when m<m1 , angle >90' but there is no mathematical proof to show this...