Linear momentum Definition and 327 Threads

Homework Statement A piece of wood mass of 10 kilograms Placed on a smooth surface. 15 bullets were fired towards the piece and stabilized in . The mass of one bullet is 40 grams and its velocity is 1000 meters in second. Find the velocity of the piece of wood after the 15 bullets...

A small body of mass m placed over a larger mass M whose surface is horizontal near the smaller mass and gradually curves to become vertical. The smaller mass is pushed on the longer one at a speed v and the system is left to itself. Assume all surfaces to be frictionless. (Please refer the...

I'm just learning about linear momentum in classical mechanics and I have a question about it. I'm not sure I understand the concept well thus my question can be senseless. It is said that \frac{d\vec{P}}{dt}=\sum F_{ext.}. Say I observe a group of 1000 bodies in about 50 m^2. --1--Is...

Homework Statement A number of particles with masses m(1), m(2) , m(3),... are situated at the points with positions vectors r(1),r(2), r(3),... relative to an origin O. The center of mass G of the particles is defined to be the point of space with position vector...

Why do we apply law of conservation of linear momentum on a body that explodes in air when an external force, gravittional force- mg, is acting on it? The law says that the linear momentum is conserved in absence of the external forces.

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...

As an example, if you raise your arms in front of you, your center of mass will move slightly forward. However, you would not fall down because your feet's platform won't allow it. Does this constitute linear momentum, or does the entire system need to move in order to have linear momentum...

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

Problem Can the total energy and linear momentum of a particle moving in one dimension in a constant potential field be measured consecutively with no uncertainty in the values obtained? Solution Yes, this is possible. The energy and linear momentum operators are, respectively \hat{H} =...

[SOLVED] Linear Momentum - One-Dimensional Internal Explosion 1. A body is traveling at 2.0m/s along the positive direction of an x axis; no net force acts on the body. An internal explosion separates the body into two parts, each of 4.0 kg, and increases the total kinetic energy by 16 J. The...

[SOLVED] Conservation of linear momentum and inelastic collision Homework Statement I have a homogeneous beam of length L and mass M, attached with a frictionless hinge at one of the endpoints O. The beam is affected by gravity, g, in the negative y-direction. Initially the beam hangs...

[SOLVED] Linear momentum and impulse problem Homework Statement A 3.0-kg steel ball strikes a massive wall with a speed of 10 m/s at an angle of 60 degrees with the surface. It bounces off with the same speed and angle (see Figure 9.30). If the ball is in contact with the wall for 0.20 s...

All right, so, we just went over linear momentum in school, and one thing is confusing me: If I throw something at a wall, why does it bounce back? (I'm assuming both the object and the wall are infinitely hard and don't get deformed, and the wall won't move) It seems pretty...

Homework Statement A 0.70 kg ball is moving horizontally with speed of 9.6 m/s when it strikes a vertical wall. The ball rebounds with speed of 1.3 m/s. What is the magnitude of the change in linear momentum of the ball? Homework Equations Dp = mv(f) - mv(i) The Attempt at a...

Homework Statement A particle (m1) w/mass 0.080 kg has an initial velocity of 50m/s in the +x-direction and collides with a particle (m2) w/mass 0.060 kg with an initial velocity of 50m/s in the +y-direction. After the collision, particle (m1) and particle (m2) are stuck together and travel at...

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...

Homework Statement http://img508.imageshack.us/img508/7199/46168034nt3.jpg The Attempt at a Solution I'm just totally lost with this question. The theory just eludes me totally. Just how do you determine whether it is/isn't an eighenfunction of the linear momentum operator?

[SOLVED] (101)Conservation of linear momentum Homework Statement A 86.7 kg man is standing on a frictionless ice surface when he throws a 0.1 kg book at 11.2 m/s. With what speed does the man move across the ice as a result? Homework Equations Since the momentum of the thrown book must...

yeah, part c was for the block :) ahh..I thought I had the right answer originally but it didn't say if variables were supposed to be left in the problem, so I kind of doubted myself. Thanks for the help you guys. I am learng physixguru, maybe slowly, but learning. lol

Homework Statement If I have a bird that flies into a flag-pole with velocity x m/s, and the flag-pole trips, how do I find the linear momentum of the flag-pole/bird system? (The bird gets stuck to the flag-pole). The Attempt at a Solution I know how to find the angular momentum, but does...

Homework Statement A 10.0g bullet is fired horizontally into a 106 g wooden block that is initially at rest on a frictionless horizontal surface and connected to a spring of constant 155 N/m. If the bullet-block system compresses the spring by a maximum of 78.0 cm, what was the velocity of...

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

I recently had a test question that gave a force acting on a bullet. The bullets mass is 0.016KG, and the force acting on the bullet is f=7000N-2.2*10^6N/s*t. The bullet is traveling 800 k/h when it leaves the gun It asked to find the total linear impulse on the bullet, and then how much...

Homework Statement A 40-tonne boxcar A is moving with a velocity of 7.2 km/h when it strikes, and is automatically coupled with, a 12-tonne flatcar B which carries a 20-tonne trailer truck C. Both the flat car and trailer truck are at rest with their brakes released. What is the velocity of...

Homework Statement given mass of bullet and box and given initial and final velocity of projectile, find kinetic friction coefficient Homework Equations G1 + integral of sum force respect to time = G2 The Attempt at a Solution I setup like this... mv(projectile) + mv(block...

Homework Statement Derive the above relationship m2(D-c) X1=--------- m1+m2 Homework Equations The Attempt at a Solution

We see a lot of examples of converting between linear motion and angular motion in our daily life. But, is the conversion between linear momentum and angular momentum possible? If so, where have the conservation law of linear momentum and the conservation law of angular momentum gone? If...

A child in a boat throws a 6.40kg package out horizontally with a speed of 10m/s. Calculate the velocity of the boat immediately after, assuming it was initially at rest. The mass of the child is 26.0kg and the mass of the boat is 45.0kg. Ignore water resistance. Relevant equations MV1 +...

What is the SI unit of momentum? --> N x s When a light beach ball rolling with a speed of 6.0 m/s collides with a heavy exercise ball at rest, the beach ball's speed after the collision will be, approximately? --> 6.0 m/s In an inelastic collision, if momentum is conserved, then which of...

Homework Statement A child throws, at 10 m/s, a 3.4 KG package, horizontally, from a boat. The boat weighs 60 kg and the child weights 20 kg. If the boat was initially at rest, what was it's speed, after the throw? Homework Equations mv+mv=mv+mv The Attempt at a Solution I am...

I am not sure if I am doing this question right. A 10g bullet, traveling at 400 m/s hits a block of wood & emerges going at 350 m/s. How fast goes the block of wood move after being hit? Is this the right way to solve it?: mv of the bullet + mv of the block = mv' of the bullet + mv' of...

H guys, I want to first start off by saying that I am not here for handout to my homework. I am here because maybe you guys can help me understand physics. I am currently enrolled in a calculus-base physics that is kicking my ass and I need some help understand the different subjects...

A 3.0-kilogram object initially at rest explodes and splits into three fragments. One fragment has a mass of 0.50 kg and flies off along the negative x-axis at a speed of 2.8 m/s, and another has a mass of 1.3 kg and flies off along the negative y-axis at a speed of 1.5 m/s. What are the speed...

I have gotten stuck in this question and don't know what to do. Show that (R X P) . (R X P) = (RP)^2 - (R . P)^2. Assume the vectors R and P lie on the xy-plane. Use this result to express the kinetic energy of a particle in terms of the momentum in the radial direction and of the square of...

I am pretty sure i have this question correct but i want to make sure it is likely to show up on a test An astronaut is motionless in outer space. Upon command the propulsion unit strapped to his back ejects some gas with a velocity of 32m/s and the astronaut recoils with a velocity of...

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...

Hello. I need confirmation on simple linear momentum questions... 1. two cars on the surface. car A approaches to car B at Va while car B is at rest. masses of both cars are same. which car puts more force or is it same? Car A exerts larger force on B Car B exerts larger force on A...

With the engines off, a spaceship is coasting at a velocity of +230 m/s through outer space. The ship carries rockets taht are mounted in firing tubes, the back ends of which are closed. It fires a rocket straight ahead at an enemy vessel. The mass of the rocket is 1300 kg, and the mass of the...

hi I'm really stuck and I hope you can help me. I know that linear momentum is a vector, but I'm still not sure how to add them together when : p1, p2, p ... linear momentum If two objects A1 ( p1 = 100) and A2 ( p2 = -100) represent an isolated system and are moving along (...

Is it possible to define linear momentum in any curved space? According to wikipedia, it's not: http://en.wikipedia.org/wiki/Linear_momentum Why? Which is an example of space-time asymptotically Minkowski?

can someone help? I have no isea how to do this problem. A force in the negative direction of an x-axis is applied for 21 ms to a 0.40 kg ball initially moving at 10 m/s in the positive direction of the axis. The force varies in magnitude, and the impulse has magnitude 32.4 Ns. (a) What is...

Hello, I need help with my homework problem: A certain radioactive (parent) nucleus transforms to a different (daughter) nucleus by emitting an electron and a neutrino. The parent was at rest at the origin of an xy coordinate system. The electron moves away from the origin with linear...

hello 1. a) Does object circling around the Earth have angular momentum or linear momentum? It seems to me that we could use either of the two momentums to describe the system? b)How about when you rotate a ball on piece of string? Again we could describe the object as having...

From this: http://www.collegeboard.com/prod_downloads/ap/students/physics/ap06_frq_physics_c_mech.pdf Question 1 is what I'd like to ask about :) For part a, for the block it would be a simple mg down, F N up and Ff to the left... For the Slab, do we include the fact that it's pushing up on...

Hello All, I have a question that i can't seem to get. If someone could help me get started on part a that would be great. So far i have tryed using P =m1v1 and can't seem to find any other equations that would help with the problem. Any help is great! Thank You Problem: A cart...

I also need help how to start his problem: "By accident, a large plate is dropped and breaks into three pieces. The pieces fly apart parallel to the floor, with v1 = 3.10 m/s and v2 = 1.60 m/s. As the plate falls, its momentum has only a vertical component, and no component parallel to the...

I'm stuck with this. The force from your car's motor is 6,000 N. The mass of the car is 900 kg. What will be you final speed after driving a distance of 25 m a. if you start from rest b. if you have an initial speed of 20 m/s. I can get W=fd but I can't get how to find the...

Could anybody help me out with the following problem? A stream of glass beads, each with a mass of 0.1 g, comes out of a horizontal tube at a rate of 100 per second. http://img4.imageshack.us/img4/11/beads1xr.th.gif The beads fall a distance of 1 m to a balance pan and bounce back to...

Particle A & B are held together with a compressed spring between them. When they are released the spring pushes them apart and they fly off in opposite directions free of the spring. The mass of A is twice that of B, and the energy stored in the spring was 60J. Once the transfer is complete...

Well here are 5 questions from my text which I've tried doing but can't seem to twist my ahead around to figure them out. I don't know if it's due to the fact that I'm not applying the relevant concepts. Thanks for any help. (1). A uniform cord of length 25cm and mass 15g is initally stuck to...