Momentum conservation Definition and 238 Threads

Homework Statement A hockey puck moving at a speed V1 collides head on with a second identical puck moving toward it at speed V2. After the collision, the first puck slows down to speed v1 without changing direction. (5 marks) a. After the collision what is the speed v2 of the second puck...

A projectile of mass M is moving in the +x direction with speed V when it explodes into two fragments: a lighter one having mass M/4 and a heavier one having mass 3M/4. The heavier fragment moves in the -y direction with speed V. What is the speed of the lighter fragment? (Assume there are...

1. Ball 1, ball 2, and ball 3 have masses 1 kg, 2 kg, and 3 kg respectively, and are initially arranged at x = 5 m, x = 10 m, and x = 15 m respectively (see picture). y = 5 m for all three balls. Now suppose that a net force of 1 N is applied to ball 1 in the +y direction and a net force of 2 N...

Homework Statement I already have the answer, I just need someone to help me understand the answer for the following momentum question: Two balls are both moving horizontally to the right on a table. Ball 1 catches up with ball 2 and collides with it. The balls stick together and continue...

Homework Statement http://www.physics.umd.edu/lecdem/outreach/QOTW/arch3/a046.htm According to the site, when a fan is blowing air into a sail, the entire cart system remains motionless. Why doesn't the following approach work: Since there are no net external forces acting on the entire...

Momentum Conservation Problem? Help please! A radioactive nucleus at rest decays into a second nucleus, an electron, and a neutrino. The electron and neutrino are emitted at right angles and have momenta of 9.30 X 10^ -23 and 5.40 X 10^ -23 kg * m/s, respectively. What is the magnitude and...

Homework Statement A rocket of total mass 3180 kg is traveling in outer space with a velocity of 115 m/s toward the sun. It wishes to alter its course by 35.0 degrees, and can do this by firing its rockets briefly in a direction perpendicular to its original motion. If the rocket gases are...

I am having trouble applying the concept of momentum conservation to this problem. The particular problem I am having is in figuring out if I did part (c) correctly. A look at Puck A: It is evident that total the momentum is conserved before the collision because the external forces acting...

Homework Statement A bullet(mass 100 g) strikes a block of 4 kg kept on a table. The friction coefficient of table-block is 0.25. The bullet gets embedded and moves a distance of 20 m. Find speed of bullet. Homework Equations The Attempt at a Solution Using Conservation of momentum, speed of...

Homework Statement When a star like our Sun no longer has any hydrogen or helium "fuel" for thermonuclear reactions in its core, it can collapse and become a white dwarf star. Often the star will "blow off" its outer layers and lose some mass before it collapses into the rapidly spinning...

Problem 1.8 from a Goldstein's mechanics text, is (verbatim since it's hard to describe otherwise) : "A system is composed of three particles of equal mass m. Between any two of them there are forces derivable from a potential V = -g e^{-\mu r} where r is the disance between the...

angular momentum conservation?? A coil of radius R carries a current I. The plane of another concentric coil of radius r (r << R) carrying current I is perpendicular to the first coil. Both are isolated from rest of the universe and are free to rotate about their common diameter (but not free...

Homework Statement A two-ended "rocket" that is initally stationary on a frictionless floor, with its center a the origin of an x axis. The rocket consists of a central block C(of mass M = 6.00kg) and blocks L and R (each of mass m = 2.00kg) on the left and right sides. Small explosions can...

Hi Are there any exciting experiments for the conservation of linear momentum?

I recently ran across an experiment which I needed to explain because it appeared to violate energy conservation. After looking over it further, I became interested for a slightly different reason, but first I'll present the idea. The experiment involves a mass $0.75 m$ striking a rod which is...

Suppose we have an accelerated rigid body that possesses angular momentum. Then the body will undergo Thomas precession, and if the angular momentum vector of the body is not aligned with the axis of the Thomas precession, the angular momentum vector of the body will precess when viewed in an...

One more problem to solve... A soldier on skis fires a bullet from rifle horizontally. After what distance will soldier stop moving if coefficient of friction between surface of skis and snow is 0,01. Mass of bullet is 0,01 kg, initial speed of fired bullet is 900 m/s and mass of soldier, rifle...

here's the situation one ball with mass m1 and velocity v1 collides with second ball with mass m2 and 0 velocity. they stick together and the resulting blob has mass m1+m2 and velocity v3 which can be easily found using m1v1+0 = (m1+m2)v3 by conservation of momentum lets assume we are on...

b]1. Homework Statement [/b] A small block of mass .250kg is attached to a string passing through a hole in a frictionless horizontal surface. The block is originally revolving in a circle with a radius of .800 m about the hole with a tangential speed of 4 m/s. The string is then pulled...

This is my first time to use this template by the way... [b]1. A hungry 12.5 kg predator fish is coasting from west to east at 70.0 cm/s} when it suddenly swallows a 1.15 kg} fish swimming from north to south at 3.60 m/s. Find the magnitude of the velocity of the large fish just after...

A bola consists of three massive, identical spheres conected to a common point by identical lengths of sturdy string (Fig. 11-51a). To launch this native South American weapon, you hold one of the spheres overhead and then rotate that hand about its wrist so as to rotate the other two spheres in...

[b]1. A wedge mass M is at rest on horizontal frictionless table. Mass m is on wedge. There is no fricton between parrticle and wedge. Height of wedge = h and angle of incline= theta. The massm slides down wedge from rest and wedge slides left on table. How does linear momentum conservation...

Hi guys would need some help here, not sure if I did it right cause recently I got so lost/confused in the class, just out of no where. I always understood most of the stuff and the thing that irritates me is that it doesn`t seem hard at all. So here goes. Conservation Of Momentum 1) Two...

I have a question about a classical physics problem. The original problem appeared as a homework problem in a physics book and it is really an extension of the problem that causes me an issue. The original problem went something like this: A frictionless puck travels, with linear velocity...

Momentum Conservation --- so hard! Homework Statement Two automobiles collide at an intersection. One car of mass 1.4 X 10^3 kg is traveling at 45km/h [S]; the other car of mass 1.3 X 10^3 kg is traveling at 39km/h [E]. If the cars have a completely inelastic collision, what is their velocity...

Homework Statement There is a gun which mass is M = 4 kg. The length of the gun's barrel is l = 50 cm. I need to find the average recoil force while shooting the bullet which mass is m = 5g. The speed of bullet when it leaves the gun's barrel is v = 930 m/s. The Attempt at a Solution...

Can some one help me with this question please. don't really understand mathematically analyse, using diagrams, rockets burning in terms of momentum conservation and the rate of fuel consumption R and derive the acceleration for a rocket during its launch stage.

Homework Statement So imagine we have Earth and Moon, and there is a tird body(A), equidistant from moon circular tragectory in one point, from Earth. whoever, that body haven't enought graviticional Force to pull moon from his orbital around the Earth. Whoever too, that gravitacional force...

I have been screwing around with this problem for, I kid you not, almost four hours. Please walk me through to the answer... this is driving me crazy! The problem: A fireworks rocket is moving at a speed of 45.0 m/s. The rocket suddenly breaks into two pieces of equal mass, which fly off...

so here i am doing my physics homework. everythings fine, but then i get this whopper of a problem, which is for major marks, and i can't seem to solve it for some reason. here she is: a ramp is setup on the edge of a table a ball slides down this ramp and picks up speed. just as...

A playground merry-go-round of radius R = 1.20 m has a moment of inertia I = 230 kgm2 and is rotating at 10.0 rev/min about a frictionless vertical axle. Facing the axle, a 23.0 kg child hops onto the merry-go-round and manages to sit down on its edge. What is the new angular speed of the...

Hello, I do not know how to do this momentum conservation problem in the vertical direction, when the object is to find how far the second object went. A gun is fired vertically into a 1.40-kg block of wood at rest directly above it. If the bullet has a mass of 21.0g (.021 kg) and a speed of...

Say there are two objects, A and B. A is moving with X velocity and B is at rest. Upon collision, what factor determines whether A will rebound off of B and B will stay at rest. Also, what determines if the two objects will "stick" together or move in the same direction as A? I believe it has...

In pair production, an nucleus is needed to take away some momentum from the photon so momentum conservation is respected. correct?

i don't really understand question which concerns the classic example that demonstrate the conservation of angular momentum, a student on a free rotaing stool holds two weight, mass each 3kg, 1m from axis of rotation each, and he rotate with angular v of 0.75rad/s. moment if inertia of...

The photoelectric equation is given by: hf = hf0 + 1/2mv2 where f is the frequency of the incident wave and f0 is the threshold frequency. HERE, only the conservation of energy is taken into consideration and momentum conservation is neglected. Why is this approach justified? Suppose we...

I got a conceptual doubt:Momentum(linear) conservation doesn't depend on conservation of kinetic energy.But,is the opposite true?Can kinetic energy be conserved without the conservation of momentum? Thanks!

im supposed to show why angular momentum is conserved in a rotating body with no external torques or forces acting on it. i know to use the I_1*w_1=I_2*w_2 where I is the moment of inertia of the object in motion and w is the angular speed. My qu estiosn are: which equation for Inertia...