Collision Definition and 1000 Threads

The problem is like this Assume both cars A and B are intially traveling to the right at 98 ft/s. Car A is tailgating leaving very little room between car A and car B. At that instant driver of car B notices a n accident and starts to break witha deceleration of 2o ft/s^2. By the time the...

Homework Statement A solid wood door 1.00 m wide and 2.00 m high is hinged along one side and has a total mass of 49.0 kg. Initially open and at rest, the door is struck at its center by a handful of sticky mud of mass 0.500 kg, traveling perpendicular to the door at 15.0 m/s just before...

Hello, I have difficulties with this problem: The body mass m1 = 20 g is fired with a spring, k = 72 N / m from position A. On arrival at point B hits completely elastic body mass m2 = 15 g. Find the distance x of compressed spring so that the mass m2 reaches point C separated a distance d...

From University Physics, Homework Statement Canadian nuclear reactors use heavy water moderators in which elastic collisions occur between the neutrons and deuterons* of mass 2.0 u (see Example 8.11 in Section 8.4). (a) What is the speed of a neutron, expressed as a...

Hi, Homework Statement I'd like to find the minimum mass M which will render possible a second collision between M and the two masses m and the spring in the attachment, and also the time between the two collisions. It is stated that the initial velocity of M is v0 as indicated and that the...

Homework Statement An electron with KE 5eV is incident on a H atom in its ground state. The collision A)must be elastic b)may be partially elastic c)must be completely inelastic d)may be completely inelastic More than one option may be correct Homework Equations The Attempt at a...

Homework Statement Suppose that two elastic balls moving through three dimensional space collide and rebound, conserving both kinetic energy and momentum. The balls cast shadows, and these shadows moving over a flat two-dimensional surface come together, collide and rebound. Now pretend the...

1. Hi, I'm a computer engineering graduate. I'm developing a computer game similar to Soundrop (Apple). The situation is: balls fall vertically down under the effect of gravity. There are various inclined planes in the frame (of known angle of inclination). There could be multiple...

Homework Statement Suppose that an earth-mas object collides with a neutron star with radius 10 km and mass 1.4 $M_{sun}$. The material of the earth-like object would wrap around the neutron star and form a thin layer on top of the original neutron star surface. Assume the material gets...

1. A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times that of the neutron. The helium nucleus is observed to rebound at an angle '2 = 41° from the neutron's initial direction. The neutron's initial speed is 5.6 105 m/s. Determine the angle at...

Homework Statement A car is driving and hits the brakes for l1 distance before colliding with another car at rest who has the brakes on. After the collision they slide distance l2 together while braking. The mass of both cars are known, and the friction between the road and the wheels is known...

Homework Statement A halfback with a mass m1=90kg is running up field with a speed of v1=7.6m/s. He is tackled by an opponent with a mass of m2=120kg, who approaches the halfback at an angle of 30 degrees with a velocity of v2=4.0m/s. Assume the collision is perfectly inelastic. a)...

Homework Statement A 0.26 kg cue ball with a velocity 1.2 m/s collides elastically with a 0.15 kg billiard ball at rest. What percentage of the initial kinetic energy is transferred to the billiard? m1= 0.26kg Vi1= 1.2 m/s Vf1= ? m2= 0.15kg Vi2= 0 m/s Vf2= ? Homework Equations...

Homework Statement An archer fires a 20g bolt with a speed of105 m/s through a 400 g apple initially at rest. The bolt exits the apple with a speed of 45 m/s. What is the percent change in kinetic energy of the apple/bullet system? m1= 20g Vi1= 105 m/s Vf2= 45 m/s m2= 400g Vi2= 0 m/s Vf2=...

Homework Statement Two railway trucks of masses m and 3m move towards each other in opposite directions with speeds 2v and v respectively. These trucks collide and stick together after the collision. What is the speed of the trucks after the collision? Homework Equations Conservation...

Homework Statement http://puu.sh/5rfl9.png Homework Equations CM = Σmr / Σm L = Σ (r x p) The Attempt at a Solution CM = 0.118 * (0.0036 + 0.00657) / (0.0723 + 0.118) = 0.00630614818 m (from the centre of top disk) L = Σ (r x p) = [0.118 * (0.0036 + 0.00657) /...

Theoretical question with practical implications (trying to model yarn as mass points connected with spring systems and need to get collision response with objects right): A mass point approaches a plate under an angle. You have the coefficient of restitution β and the friction coefficient μ...

Homework Statement Mass 1 weighs 10kg and has a velocity of 5m/s [E], Mass 2 weighs 5 kg and has a velocity of 8m/s[W]. Additionally, mass 2 has a spring attached to it with k = 2000N/m. The two masses collide head-on in a perfectly elastic collision. What is the compression of the spring and...

Homework Statement This is not homework, I am trying to understand Compton scattering considering it a normal elatic collision between particles Homework Equations The Klein–Nishina formula Suppose a photon (hf= 0.511 MeV) hits an electron and the latter recoils at an angle \varphi 60°. -...

Homework Statement We have a chain of 10 blocks, all of them joined by a thin rope and placed in a straight line. Suddenly, other two blocks collide with v speed at one end with the chain of the 10 blocks. It is assumed that the table is frictionless and the collision is elastic. The main...

Homework Statement On a frictionless table, a glob of clay of mass 0.380 kg strikes a bar of mass 0.9 kg perpendicularly at a point 0.550 m from the center of the bar and sticks to it. a) a) If the bar is 1.300 m long and the clay is moving at 8.100 m/s before striking the bar, what is the...

Homework Statement What is the minimum amount of kinetic energy of proton that hits another still proton so reaction ##p+p\rightarrow p+n+\pi ^+## is possible? How big part of the initial kinetic energy is used for kinetic energy of new particles?Homework Equations The Attempt at a Solution...

Hi everyone, I am stuck with this problems. Homework Statement A block (m1 = 2.5 kg) sits at rest on a horizontal frictionless surface, connected to an unstretched spring (k = 190 N/m) whose other end is fixed to a wall. Another block (m2 = 1.0 kg) whose speed is 4.0 m/s collides head-on...

Homework Statement What is the minimum amount of kinetic energy of electron that hits another electron, so ectra electron-positron pair is produced. Homework Equations ##p^{\mu }=(E/c,\vec{p})## The Attempt at a Solution Before the collision: ##p^{\mu...

Hi, experts I got a very naive question. I read the following sentence in a paper: "New results on the production of charged pions in p+p interactions are presented. The data come from a sample of 4.8 million inelastic events obtained with the NA49 detector at the CERN SPS at 158 GeV/c beam...

I'm currently trying to make a proof to convince myself that when two object collide and stick afterwards, there is maximum energy loss. I've been thinking about it and trying to come up with a mathematical proof to solidify the idea in my head. Please tell me if there's any errors in my...

Hey, I'm stuck on this problem. If someone could point me in the right direction, it'd be greatly appreciated. : Two objects of the same mass, m = 1.00 kg, are projected towards each other. The first object initially has velocity (20.0m/s)i^. The second object has initial velocity...

What would the Hamiltonian for a system of two classical point particles, with no interaction except for an elastic collision between them at a point look like? My gut says it's the usual T + V, with T = p12/2m1 + p22/2m2 and V = Kδ(r1-r2) With K approaching infinity -- each particle...

Ashcroft & Mermin, Solid State Physics, page 315: "According to the Bloch theory, an electron in a perfectly periodic arrays of ions experiences no collision at all". But how about the electron at the border of Brillouin zone? How does diffraction take place there?

1. The problem statement a comet gets in the way of the Halley asteroid, so the question is: what's the new trajectory of the asteroid (its excentricity, its orbital rotation and it perihelion, aphelion) both objects have same mass and we suppose that the comet have an negilgeable...

1. The problem statement. Two boys are sliding toward each other on a frictionless, ice-covered parking lot. Jacob, mass 45 kg, is gliding to the right at 7.98 m/s, and Ethan, mass 31.0 kg, is gliding to the left at 10.7 m/s along the same line. When they meet, they grab each other and hang on...

Homework Statement A neutron of mass 1.7 X 10^-27 kg traveling at 2.2 km/s, hits a stationary helium nucleus of mass 6.6 X 10^-27 kg. After the collision, the velocity of the helium nucleus is 0.53 km/s at 52° to the original direction of motion of the neutron. Determine the final velocity of...

An atom of mass m1 = m moving in the x direction with speed v1 = v collides elastically with an atom of mass m2 = 5m at rest. After the collision the first atom moves in the y direction. Find the direction of motion of the second atom. ________ ° counterclockwise from the +x-axis Find the...

Homework Statement A bullet of mass m and speed v passes completely through a pendulum bob of mass M. The bullet emerges on the other side of the pendulum bob with half its original speed. Assume that the pendulum bob is suspended by a stiff rod of length L and negligible mass. What is the...

Homework Statement In the figure shown, a ball of mass m collides perpendicularly on a smooth stationary wedge of mass M, kept on a smooth horizontal plane. If the coefficient of restitution of collision is e, then determine the velocity of the wedge after collision. Homework Equations...

When following solutions like this link: http://physics.about.com/od/physicsmtop/g/PerfectlyInelasticCollision.htm I understand that energy is lost, but it doesn't necessarily show that this is MAXIMUM energy loss, just that there is energy lost. How would you go about proving that more energy...

Homework Statement A ball with an initial speed of v1 = 21.5 m/s collides elastically with two identical balls whose centers are on a line perpendicular to the initial velocity and that are initially in contact with each other. The first ball is aimed directly at the contact point and all...

Phonons are quantized lattice vibrations. They are traveling waves of the form exp(ikr) taken to satisfy periodic boundary conditions. I'm guessing periodic boundary conditions are equivalent to demanding the waves to be zero at the boundary. which is what characterizes standing waves (right...

Homework Statement The given figure shows a mechanical system free of any dissipation. The two spheres (A and B) are each of equal mass m, and a uniform connecting rod AB of length 2r has mass 4m. The collar is massless. Right above the position of sphere A in figure is a tunnel from which...

Simply put, either by chance or a suicidal type-III Civilization, 2 neutron stars, or a neutron star an a large-ish main sequence star are thrown at each other and fall STRAIGHT into each other. What happens? Does the ~1.4 C Newtonian impact speed result in them getting blown up and releasing...

Homework Statement part #1: A wooden block with m1 = 2.9kg is sliding across a frictionless surface in the −x direction at 4.5 m/s. A smaller wooden block with m2 = 1.1 kg block is traveling in the +x direction at 2.9 m/s. part #2: Now they make a head-on elastic collision. (This means that in...

What would you respond on this question? Would you correct me if necessary on my response please? Thanks 1. A turtle and a Lion have a violent collision on a frictionless horizontal field. As you witness the collision you realize that you are in the center of mas system. After the collision...

Let me preface this by saying that this is a take home quiz and I'd really appreciate it if you didn't actually answer the question, I have outlined what I've done and what I plan to do to get an answer and I'm looking for input on my problem solving process. I have a problem that I've been...

Homework Statement Prove that, for any 1D elastic collision between two particles: as viewed from the centre of mass (or zero momentum) frame of reference, the velocity of each particle after the collision has the same magnitude but opposite sign to its velocity before the collision. 2. The...

Homework Statement Two objects collide on a horizontal frictionless surface. Object 1 comes from the left with mass .753kg and initial velocity of -.28m/s collides with object 2 moving from the right with an unknown mass and an initial velocity of .28m/s. They stick together when collided and...

Homework Statement A 1.5 kg mass slides across a horizontal, frictionless surface at a speed of 2.0 m/s until it collides with and sticks to the free end of a spring with spring constant 50 N/m. The spring's other end is anchored to the wall. How far has the spring compressed when the mass, at...

Homework Statement If two objects are moving towards each other with two different velocities and two different mass then crash and stick together, find the force acted upon each object during the collision if the collision occurred over some time "t" Homework Equations m1v1+m2v2 =...

Is momentum really conserved in a perfectly inelastic collision? By definition there is no conservation of kinetic energy, but isn't conservation of momentum dependent on conservation of energy? Shouldn't a system whose model takes into account conversion of kinetic energy into heat and...

Hello, I'm sorry that I can't format the thread as intended and for very likely misuse of terms, but I'm a programmer barely remembering anything form physics (and non-native english speaker to boot), and I have a theoretical problem, not an actual homework. However I believe the problem is...

http://i.minus.com/i7YDkagp0bChQ.png Homework Equations p = mv (v1m1 + v2m2) Vf = -------------------- (m1+m2) The Attempt at a Solution I got that the total momentum was 9.64 by using p=mv for summing m1, v1 and m2, v2. Then I used inverse trig to try...