Conservation of momentum Definition and 751 Threads

Using both cinservation of energy and conservation of momentum, show that the spring constant k is given by k=2mg/H[1+mg/(m+M)H] I thought that this would go easier if I rewrote the expression for kinetic energy in terms of momentum, but I can't exactly get around figuring the change in...

SOmeone explain to me this because I am lost. i got 2 masses one velecity. the equation is like is mass times volocity + mass times velocity=0 122kg*22m/s+14kg*v=0 I made these numbers up what i do is multiply and add then move my anwser to the other side becoming negative but that doesn't...

I’m currently involved in a debate with a few folks regarding the validity of the Conservation of Momentum principle. One demonstration of its failure was dropping a book. The book begins with no momentum, gains momentum, then looses it and again has none (when it hits the floor). Of...

I was doing a lab one day in school and me and my teacher noticed something this isn't homework. We were wondering about conservation of momentum in the lab. The way it was done was we attached a small little ramp on the table. On the ramp we put a marble and let it slide down the ramp and onto...

Can anyone help me with these two problems? Thank-you 1.) Two carts with masses of 15.5 kg and 6.0 kg, respectively, move in opposite directions on a frictionless horizontal track with speeds of 7.0 m/s and 2.0 m/s, respectively. The carts stick together after colliding head-on. Find the...

I read the answer of it, but I don't get why the answer is that. And the answer is 1/2 M gun x (M bullet * V bullet / M gun)^2 - 1/2 M gun+you x (M bullet * V bullet/ M gun+you) ^2thx!

if i hit a still 1 kg billiard ball with another 1kg ball at 10 m/s the second ball will stop and the first ball will acquire a speed of 10 m/s, both conservation of momentum and energy acomplish but if i hit a still 10 kg ball with a 1 kg ball at 10 m/s the 10 kg ball will acquire a speed of...

I need help getting started solving the following. Show that when the recoil kinetic energy of the atom, p^2/2M, is taken into account the frequency of a photon emitted in a transition between two atomic levels of energy difference delta-E is reduced by a factor which is approximately (1 -...

The theorem of conservation of momentum states that the quantity of momentum is always the same. When two objects collide, during the interval of time they touch each other their velocities are the same but are in the same time changing, if they are both changing but remaining equivalent, why is...

A He4 nucleus, with a mass of 4 amu moving with speed v breaks up into a neutron 1amu and a He3 nucleus 3amu . If the neutron moves in a direction perpendicular to the direction of motion of the original He4 nucleus with speed 3v, what is the speed of the He3 nucleus? if the neutron moves...

Question: On a frictionless, horizontal air table, puck A (with mass m_1) is moving toward puck B (with mass m_2), that is initially at rest. After the collision, puck A has a velocity of v_1 to the left, and puck B has velocity v_2 to the right. 1. What was the speed of puck A before the...

Somebody throws me a ball with mass .400 kg at velocity 10.0 m/s. My mass is 65.5 kg. 1. If I catch the ball, with what speed do the ball and I move afterwards? Shouldn't the answer be (.400)(10.0=(65.9)(v_2), where v_2=.0607m/s?

ball with a mass of 0.10 kg has a velocity of 7 m/s. It strikes a concrete wall perpendicularly and bounces straight back with velocity of 4 m/s. The change in the ball's momentum was equal to Response Answer Choices a. 0.30 kg m/s b. 0.10 kg m/s c. 0.40 kg m/s d. 1.1 kg m/s...

Hi all, I'm having a tough time with a below question and would like some hints on where I've gone wrong if my answer is incorrect. I think the reason it's difficult is because it intuitively doesn't make sense, ...heading 90 degrees south after initially traveling due east, not to mention...

"When a positron emitted in beta+ decay annihilates with an electron, the combined mass of the two particles, m = 2me, is converted into an amount of energy 2mec^2 in the form of two 511 keV gamma rays. Momentum conservation requires that the two gamma ray photons are emitted in opposite...

i don't know how to solve this problem is it a conservation of momentum problem? because can't you just use mv=mv?

Okay, here's the problem: A 24 g bullet is fired horizontally, embedding itself in a 10 kg block initally at rest on a horizontal ice surface. The block slides the ice, coming to rest in 2.0 s at a distance of 60 cm from its original position. Assuming that the frictional force stopping the...

PLEASE, please help! I have been working on this problem for two days and am about to pull my hair out. This is a distance course, so I have no one to ask for help. I am trying to solve a conservation of linear momentum problem in which there are two unknowns. Object 1 (0.5 kg), going 7.0...

Hi, I am having trouble recalling my concepts in momentum. I just remember its conserved :rolleyes: Plus, I am horrible with directions, so need help understanding this problem, as well as the underlying concepts. Two pool balls are rolling along a pool table. The orange pool ball has...

I was reading on the conservation of momentum and they mention how in isolated systems momentum is always conserved and if the external forces of the system is zero. In the case of friction or drag acting against the motion of a body would that be considered as part of the isolated system or an...

On a frictionless table, a glob of clay of mass 0.38 kg strikes a bar of mass 1.76 kg perpendicularly at a point 0.12 m from the center of the bar and sticks to it. If the bar is 0.66 m long and the clay is moving at 5.7 m/s before striking the bar, what is the final speed of the center of...

hi! i'm having trouble solving this problem...hopefully someone can at least get me started A raft of mass 180 kg carries two smimmers of mass 50 kg and 80 kg. The raft is initially floating at rest. The two swimmers simultaneously dive off opposite ends of the raft, each with a horizontal...

Shouldn't Conservation of Momentum Be Conserved in this Problem? Alright, I am deeply confused on this problem. It goes like this: A big sledge is standing at rest on a horizontal icy surface. A rail is placed in such a way that the sledge can move only along a straight line. It is assumed...

I am having a bit of a conceptual problem with the conservation laws. Consider a system of two bodies of mass m each. One moving at speed V1 towards the second body which is at rest. For the case of an inelastic collision, I understand that the total kinetic energy of the system is not...

The last stage of a rocket is traveling at a speed of 8000 m/s. This last stage is made up of two parts that are clamped together, namely, a rocket case with a mass of 330.00 kg and a payload capsule with a mass of 155.00 kg. When the clamp is released, a compressed spring causes the two parts...

Conservation of momentum and energy :D :frown: Wats this question on bout? 1. [HRW6 10.P.026.] In Fig. 10-32a, a 4.00 g bullet is fired horizontally at two blocks at rest on a frictionless tabletop. The bullet passes through the first block, with mass 1.20 kg, and embeds itself in the...

In an elastic collision between two objects. Show that the speed of approach is equal to the speed of seperation. I know you have two equations, the conservation of momentum and the conservation of kinetic energy, but I wouldn't know how to solve the equations.

Hi, I am unable to solve this problem. :zzz: I applied Law of Conservation of Momentum but unable to get the related answer. The problem is as. :!) "A rocket is moving vertically upward. % Kg fuel gas is released out of it in downward direction with a velocity of 5000 m/s. If the...

Does a ball falling to Earth violate conservation of momentum?

im working on a mathematical model of Newton's cradle. I am trying to explain mathematically why, when two balls are released, two balls pop up the other side etc. i said that if there are N balls in the cradle, each with mass m, and the two balls you displace have gained a velocity v by the...

A block (A) collides with block (B). The blocks were in contact for 0.25 seconds. So what is the force exerted on block (A) by block (B)? I used the formula for impulse and set it equal to the momentum. But it requires a change in velocity for it to work. I already know the velocity of each...

A uniform thin rod of length 0.40 m and mass 3.5 kg can rotate in a horizontal plane about a vertical axis through its center. The rod is at rest when a 3.0-g bullet traveling in the horizontal plane of the rod is fired into one end of the rod. As viewed from above, the direction of the bullet's...

The problem is: A uniform thin rod of length = .5m and mass M = 4.0kg can rotate in a horizontal plane about a vertical axis through its center (I = ML^2/12). The rod is at rest when a bullet of mass m = 3.0g traveling in the horizontal plance of the rod is fired into one end of the rod. As...

A cannon rigidly attached to a carriage, whic can move along horizontal rails but is connected to a post by a large initially unstreched spring with a force constant k=2x10^4N/m. The cannon fires a 200kg projectile at a velocity of 125m/s directed 45 degrees above the horizontal. a) If the...

A circus cannon, which has a mass M = 2500 kg, is tilted at q = 35°. When it shoots a projectile at v0 = 30 m/s with respect to the cannon, the cannon recoils along a horizontal track at vcannon = 2 m/s with respect to the ground. a) At what angle to the horizontal does the projectile move...

This one is giving me fits for some reason: A proton of mass m undergoes a head-on collision with a stationary carbon nucleus of mass 12m. The speed of the proton is 300 m/s. Find the velocity of the proton after the collision. Ok, I know that both momentum and energy are conserved. So...

I can't seem to figure out what the damn question is asking :D. Can anyone explain what the question is asking? During a chicago storm, winds can whip horizontaly at speeds of 100 km/h. If the air strikes a person at the rate of 40kg/s per square meter and is brought to rest, calculate the...

I'm not sure what I've done wrong on this problem, so anyone who sees my mistake, please let me know! Two blocks are moving on a frictionless surface. The first block's mass is 1.17 kg and its initial velocity is 5.50 m/s. The second block's mass is 2.73 kg and its initial velocity is 2.15...

[FONT=Arial]undefinedundefinedundefined A boat of mass m is carrying a load of bricks with a total number of N and mass M, and is floating freely on water. SUPERMAN, in a show of strength, throws the entire load of bricks backward at once with a relative speed of v0. A GENIUS, in a show of...

Whew, I finished the kinetic and power problems thanks to the help of marlon and arildno, but now I have some questions on momentum. Hopefully this will help others who need help with the concept. Firstly, I have some questions on basic principle to get down(I'm hoping I got these right as...

Two football players run into each other at midfield. We can (or cannot) realistically apply conservation of momentum to calculate the players' velocities just after the impact because A. The system of interest floats in space. B. The players are functionally isolated. C. We can treat...

Hi all, I have become frusturated at a conservation of momentum problem. A space ship(ss) with a mass of 2.0*10^6 [kg] is crusing at a speed of 5.0*10^6 [m/s], when it blows up. One section(s1), with mass 5.0*10^5 [kg] is blown straight backwards at a speed of 2.0*10^6 [m/s]. The second...

Hi, i was wondering if anybody can help me with the following problem: A plate drops onto a smooth floor and shatters into 3 pieces of equal mass. 2 of the pieces go off with equal speeds v at right angles to one another. How do I find the speed and direction of the third piece? I know...

I have a conservation of momentum equation Q! A 0.25kg skeet (clay target) is fired at an angle of 30 degrees to the horizon with a speed of 30 m/s. When it reaches its maximum height, it is hit from below by a 15g pellet traveling vertically upward at a speed 200m/s, the pellet is imbedded in...

A playground merry-go-round has a disk-shaped platform that rotates with negligible friction about a vertical axis. The disk has a mass of 200kg and a radius of 1.8 m. A 36-kg child rides at the center of the merry-g-round while a playmate sets it turning at 0.25 rev/sec. If the child then walks...

Someone can explain about conservation of momentum ? Thanks

can u please tell me what i did wrong? A 70 Kg person stands at the back of a 200 Kg boat of length 4 m that floats on stationary water. he begins to walk toward the front of the boat. When he gets to the front how far back will the boat have moved? (neglect the resistence of water) The...

We are doing Cons. of Momentum in my intro to physics class.. and I am stuck on this problem: An explosion breaks an object into two pieces, one of which has 1.58 times the mass of the other. If 7370 J were released in the explosion, how much kinetic energy did the heavier piece acquire...

Here's the Problem: A bullet of mass m=19.8 g is shot vertically upward into a block of wood of mass M=119 g that is initially at rest on a thin sheet of paper. The bullet passes through the block, which rises to a height of H=0.71m above its initial position before falling back down. The bullet...

Hi guys! I have solved some physics problems and was wondering if anyone would check over my work to reassure me of my answers? That would be great! 1) A pilot having a mass of 75 kg flies a plane in a vertical loop. At the top of the loop, where the plane is completely upside down, the...