Collisions Definition and 693 Threads

A uniform rod of length L1 = 2.2 m and mass M = 2.8 kg is supported by a hinge at one end and is free to rotate in the vertical plane. The rod is released from rest in the position shown. A particle of mass m is supported by a thin string of length L2 = 1.8 m from the hinge. The particle sticks...

If i had enough matter and antimatter to release same amount of energy as a small camp fire, would the gamma rays be dangerous?

[b]1. A railroad car of mass 28400kg moving at 2.33 m/s collides and couples with two coupled railroad cars, each of the same mass as the single car and moving in the same direction at 1.06 m/s. What is the speed of the three coupled cars after the collision? Answer in units of m/s [b]2...

Homework Statement .100-kg stone rets on a frictionless, horizontal surface. A bullet of mass 6.00g, traveling horizontally at 350 m/s, strikes the stone and rebounds horizontally at right angles to its original direction with a speed of 250 m/s. (a) Compute the magnitude and direction of the...

If one considers an ideal gas, what does the mean time between collissions of the molecules depend upon? molecular size? number per unit volume? temperature of the gas? I'm thinking so far, it must def depend on number density. It would usually depend on molecular size (but I thought an ideal...

On a cold winter morning, a child sits on a sled resting on smooth ice. When the 9.10 kg sled is pulled with a horizontal force of 37.0 N, it begins to move with an acceleration of 2.50 m/s^2.The 23.0 kg child accelerates too, but with a smaller acceleration than that of the sled. Thus, the...

A block of mass m1 = 1.0 kg slides along a frictionless table with a velocity of +10 m/s. Directly in front of it, and moving with a velocity of +3.0 m/s, is a block of mass m2 = 9.0 kg. A massless spring with spring constant k = 1120 N/m is attached to the second block as in the figure below...

1. Kevin has a mass of 87kg and is skating with in-line skates. He sees his 22-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 3.4 m/s. Ignoring friction, find Kevin's speed just before he grabbed...

Homework Statement A 12g bullet is fired at 1600m/s into a wooden block of a ballistic pendulum, causing it to swing back, raising up 1.40m vertically. Find mass of the block Homework Equations N/a The Attempt at a Solution bullet momentum= 12g*1600m/s=19.2kgm/s

As a beginner in QM I have a question that I could not find answered in my books. Two particles evolve happily according to the Shroedinger equation. How can they collide? In classical mechanics they collide when their trajectories intersect and their motion is then calulated using the...

The present LHC schedule has first collisions scheduled for Thursday.

I mean, are the particles revealed or are they created? I got to thinking about this when I was reading about the LHC and how they will be able to "find" or "observe" new particles because it can reach higher energy levels. What exactly does this mean?

Hello, I am new here, so I don't know if this is the right place to post this question or not, if not please move it to the right place. At the moment I am working on making a computer simulator for rigid bodies using java, the only problem is that I thought that high school physics would...

“Teaching aids” The moderators and Gurus might want some recent “teaching aids”. Perhaps you will want to put some of these into a "sticky" The CERN site is producing some very good “teaching aids”. If you can, look at the ppt presentation, since it has animations. There are 3 pdf files at...

I am going through some questions for resits in August, and I have no idea what this question is wanting me to explain : "Briefly discuss the circumstances under which (i) momentum, (ii) kinetic energy and (iii) total energy are conserved in collisions between two bodies. [3]" it's only a...

A 920-kg sports car collides into a rear end of a 2300 kg SUV stopped at a red light. The bumpers lock, the brakes are locked, and the two cars skid foward 2.8 m before stopping. The police officer, knowing that the coefficient of kinetic friction between tires and road is .80 , calculates the...

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...

Is there a proof showing how perfectly inelastic collisions result in the maximum kinetic energy loss? Thanks.

Consider two objects, a and b, traveling toward each other at, say, 100 m/s. There are three observers, OA, OB, and OC. With respect to OA, a is stationary. With respect to OB, b is stationary. From OC's point of view, both objects are approaching each other at 50 m/s. From OA's perspective, b...

[SOLVED] collisions of molecules.. Homework Statement a 10cm^3 box contains nitrogen at 20degreeC. What is the rate of collisions on one wal of he box. Homework Equations kb=1.38x10^-23 1u=1.661x10^-27 molecular mass of N2=28u avagadros number=6.02x10^23mol^-1 vrms=sqrt((3kbT/m))...

[SOLVED] Relativistic kinetic energy and proton collisions Homework Statement Find the minimum proton kinetic energy required to produce an antiproton in the reaction P+P\rightarrow P+P+P+\overline{P} for protons: (a) Incident on protons of equal and opposite momentum, (b)...

Hi there, I have been struggling with this problem for a while. It's an A-Level Mechanics problem. A smooth groove in the form of a circle of radius a is carved out of a horizontal table. Two small spheres, A and B, lie at rest in the groove at opposite ends of a diameter. At time t = 0...

A 0.400 kg bead slides on a straight frictionless wire with a velocity of 3.50 cm/s to the right. The bead collides elastically with a larger 0.600 kg bead initially at rest. After the collision, the smaller bead moves to the left with a velocity of 0.70 cm/s. Find the distance the larger bead...

Homework Statement Q] A meter stick weighing 240 grams is pivoted at it's upper end in such a way that it can freely rotate through this end. A particle of mass 100 gms is attached to the upper end of the stick to a string of length 1m. Initially the rod is kept vertical and the string...

For an experiment in physics class, I had to roll a steel ball down a ramp so that it makes a collision with another steel ball of the same size, knocking it off a support near the edge of the table, and go off in different directions and land on a sheet, on the bottom of the table, which marks...

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...

True or False: In a collision between a small car and a large truck, the car and the truck undergo the same change in velocities. False- mor mass more change in velocity right??

This is the way I understand inelastic collisions. Please correct me if I'm wrong on this. In an inelastic collision, kinetic energy is converted into internal energy and is lost (often in the form of heat). So, one cannot say that energy is conserved. Momentum, however, is conserved in this...

Homework Statement In outer space a rock with mass 4 kg, and velocity < 4000, -2800, 3400 > m/s, struck a rock with mass 18 kg and velocity < 250, -290, 260 > m/s. After the collision, the 4 kg rock's velocity is < 3600, -2300, 3900 > m/s. What is the final velocity of the 18 kg rock...

Homework Statement A bullet with a mass of 7.00 , traveling horizontally with a speed of 400 , is fired into a wooden block with mass of 0.850 , initially at rest on a level surface. The bullet passes through the block and emerges with its speed reduced to 200 . The block slides a distance...

Homework Statement Two objects are at rest on a frictionless surface. Object 1 has a greater mass than object 2. When a constant force is applied to object 1, it accelerates throught a distance d. The force is removed from object 1 and is applied to object 2. At the moment when object 2 has...

Elastic/Inelastic collisions are always defined in terms of KE, it being conserved in elastic and not in inelastic. But what happens to PE? In horizontal applications there's usually no PE involved, but consider a ball dropped onto a surface that experiences an inelastic collision. The ball...

[SOLVED] Angular momentum and collisions Homework Statement A wooden block of mass M resting on a frictionless horizontal surface is attached to a rigid rod of length \ell and of negligible mass. The rod is pivoted at the other end. A bullet of mass m and traveling parallel to the...

Homework Statement a 600 kg canon, initially at rest, exploded upon firing and broke into three fragments. One fragment of mass of 200 kg traveled east at 40m/s and a second fragment of mass 300 kg traveled due south at 20 m/s. What was the velocity of the third fragment? Homework...

1) A 10.0-g object moving to the right at 20 cm/s makes an elastic head-on collision with a 15.0-g object moving in the opposite direction at 30.0 cm/s. Find the velocity of each object after collision. 2) A billiard ball rolling across a table at 1.50 m/s makes a head on elastic collision...

I given to objects of masses m1 and m2 and initial velocities v1 and v2, I know how to find out out v1' and v2', their velocities after the collision by settings up simultaneous equations. However, that takes a long time to solve, and there is a shortcut that my teacher told my class that I...

[SOLVED] simple collisions question Homework Statement http://img180.imageshack.us/img180/1253/28157442gm4.jpg Homework Equations √(2gh) The Attempt at a Solution a) Gravitational potential energy = kinetic energy this gives u √(2gh) = 0.815 metres b) i)...

What is the difference between electron capture, and electron-proton collions? My textbook has the feynman diagram of electron capture as a proton decaying into a neutron, and the proton emmiting a W+ boson, which is received by an electron, which then decays into a neutrino. However, the...

Dear all, I know the equation to conservation of momentum. How do I show that kinetic energy is always conserved if it says that the mass of the two objects are the same. The following is the explanation I found but I don't get part of it. The red arrow part (attached image) is where...

Homework Statement An object explodes into 3 equal masses. One mass moves east at a velocity of 15.0 m/s . If a second mass moves at a velocity of 10.0 m/s 45degrees south of east. What is the velocity of the 3rd object Homework Equations I know m1 = m2 = m3 therefore we have just M...

A .45kg piece of putty is dropped from a height of 2.5m above a flat surface. When it hits the surface, the putty comes to a rest in .30s. What is the average force exerted on the putty by the surface? V=d•t F=m•a a=v/t

Homework Statement Block A of mass, mA = 2.0 kg, is moving on a frictionless surface with a velocity of 5.0 m/s to the right and another block B of mass, mB = 8.0 kg, is moving with a velocity of 3.0 m/s to the left, as shown in the diagram below. The two block eventually collide. d. If...

Homework Statement A 0.321 kg puck, initially at rest on a horizon- tal, frictionless surface, is struck by a 0.227 kg puck moving initially along the x-axis with a speed of 2.51 m/s. After the collision, the 0.227 kg puck has a speed of 1.51 m/s at an angle of 31 degrees to the...

Hey these could be simple questions with easy formulas and just plugging in but i don't have them my teacher is the worst teacher i have ever had in high school and what help i can get is appreciatedHomework Statement A 68.0 kg ice skater moving to the right with a velocity of 2.99 m/s throws a...

Moonbear, I've just found another possible research project for you using your sheep! http://arxiv.org/abs/0711.3804 You can verify the physics of what these people have calculated by letting your sheep head-butt and determine if there's any brain damage! :) Don't you just love it when...

Homework Statement Particle 1 has initial velocity v, directed to the right, and particle 2 is initially stationary. Let the mass of particle 1 be m and the mass of particle 2 be 3m. If the collision is perfectly inelastic, what are the velocities of the two particles after the collision...

Homework Statement A ballistic pendulum is a device used to measure the velocity of a projectile. The projectile is shot horizontally into and becomes embedded in the bob of a pendulum as illustrated below. The pendulum swings upward to some height h, which is measured. The mass of the bullet...

Homework Statement A car with mass of 950 kg and speed of 16 m/s approches an intersection in the positive x direction. A 1300-kg minivan traveling at 21m/s is heading towards the same intersection in the positive y direction. The car and minivan collide and stick together. Fine the speed and...

Homework Statement Marble A, mass 5g moves at a speed of 20 cm/s. It collides with a second marble B, mass 10 g, moving at 10 cm/s in the same direction. After the collision, marble A continues with a speed of 8 cm/s in the same direction. A) Calculate the momentum of each marble before the...

Homework Statement A block of mass M is resting on a horizontal, frictionless table and is attached as shown above to a relaxed spring of spring constant k. A second block of mass 2 M and initial speed v0 collides with and sticks to the first block. Develop expressions for the following...