# momentum

1. ### How Earth maintain its same angular momentum even after sun disappears?

How Earth maintain its same angular momentum even after sun disappears ?
2. ### Why we have to add I Ï‰ to final angular momentum; Lf?

A 1 kg mass of clay, moving with a velocity of 10 m/s, strikes a stationary wheel and sticks to it. The solid wheel has a mass of 20 kg and a radius of 1m. Assuming that the wheel is set into pure rolling motion, the angular velocity of the wheel immediately after the impact is approximately...
3. ### Beamer relationship to Law of Conservation of Momentum

https://en.m.wikipedia.org/wiki/Beamer_(cricket) https://www.physicsclassroom.com/Class/momentum/u4l1a.cfm Can we apply Law of conservation of momentum to Beamer? Thanks & Regards, Prashant S Akerkar
4. ### Quantum Mechanics: Momentum Expectation Value

Hello forum, I was doing some quantum mechanics earlier and I was finding expectation values for a given wave function $\psi(x,t)$ specifically for momentum $\langle p \rangle_\psi$ I got $\langle p \rangle_\psi = 0$. What does this solution tell me? That the particle is most likely...
5. ### Velocity in Momentum

How do you get the velocity after a collision if one body towards left have a mass of 5kg while the other body with a mass of 10kg with a velocity of 2m/s towards right. How do you find the velocity of the body with the mass of 5kg towards left?
6. ### rate of angular momentum of a point

Hi, Does anyone know how to calculate the rate of angular momentum of a point,Q? Google is not helping me right now. Thanks
7. ### Help with conservation of momentum question

Q1) Tiny Tim of mass 72kg is playing in the super bowl against the Arizona Cardinals. Tiny Tim is running at 4ms-1 when he collides with Alan Branch, with mass 165kg, running in the opposite direction with a speed of 5ms-1. Momentarily after the collision Alan Branchâ€™s velocity was 0ms-1...
8. ### conservation of momentum

I've done 3 and 4 just want a clarification that its right Q3) Maxim, of mass 70kg, is running at 3.5ms-1 when he jumps on a skateboard, of mass 2.2kg, travelling at 0.8 ms-1 in the same direction. i. Calculate their new combined velocity. Q4) Maxim is on his skateboard again travelling at...
9. ### Determine the angular momentum

Well finally got to the last question. I thought this one would be easy but I'm unsure. I've looked into this question. I have the mass, the velocity, and I think radius. If I manage to get the last one right that would be awesome.
10. ### please explain this momentum problem

A 40gram bullet is fired with a speed of 300m/s into a ballistic pendulum of mass 5kg suspended from a chord 1m long. Compute the vertical height through which the pendulum rises. Solution: m1v1+m2v2 = m1v1'+m2v2' 400(300)+5000(0)=40v1+5000v1 v1=2.38m/s v2=0 v2^2=v1^2 + 2gS S=h 0 = 2.38^2...
11. ### Interactive Momentum or Force.

This new term Interactive Momentum or Force. It may not be listed on the on the internet. This term has not been published. Because I invented it many years ago. Please look at the term as being: Any opposition to force or momentum. This would attribute to, wind resistance, or even possible...
12. ### Momentum Problem

Hello so I am having a problem with this question and need someone to check my workings. question: A 40kg skateboarder on a 3kg skateboard is training holding two 5kg weights. Beginning from rest, she throws the weights horizontally one at a time from her board. The velocity of the weight is...
13. ### Another Linear momentum Question

A 22g bullet strikes and becomes embedded in a 1.35kg block of wood placed on a horizontal surface just in front of the gun. If the co-efficient of kinetic friction is 0.28, and the impact drives the block a distance of 8.5m before it comes to rest, what was the muzzle speed of the bullet...
14. ### Momentum Equation

m_1u_i = m_1u_f + m_2v_f, (m_1>m_2) I want u_f in terms of m_1, m_2, u_i u_f = \frac{m_1u_i - m_2v_f}{m_1}  v_f = \frac{m_1u_i-m_1u_f}{m_2}   into  u_f = \frac{m_1m_2u_i - m_1m_2(u_i-u_f)}{m_1m_2} (m_1m_2)u_f+m_1m_2(u_i-u_f) = m_1m_2u_i...
15. ### Linear Momentum: Help with proof of derived equation

Need help deriving a couple of equations PLEASE A moving object A of mass m_A strikes a stationary Object B of mass m_B. m_A>m_B  m_Bv'_B=m_A(v_A-v'_A), (v_B=0)  v'_A=v'_B-v_A Final velocities of object A and B:  v'_B=v_A\bigg(\frac{2m_A}{m_A+m_B}\bigg) ...
16. ### Elastic and momentum problem

I've work for about 4 hours on this problem and have made absolutely no headway. This program Im taking is expecting me to answer the question, however, I cant find a way to answer it short of using black magic. So any pointers or help would be much appreciated. Anywho, here is the problem...
17. ### plz solve these questions

1. If a car is travelling north on a straight road and its brakes are applied, it will (A) have no acceleration (B) accelerate to the north (C) accelerate to the south (D)accelerate either east or west 2. A force of 10 N is acting on a body of mass 20 kg for 10...
18. ### equlibrium problem momentum arm

Hi A rod comprises a counterweight (a) a handle and a hook which hangs mass (m), the rod mass is 400g counterweight mass (a) = 1600g and the rod is 0.8m long. Equilibrium exists when the handle is at position X = 12.0cm How did I 1: calculated the length of the handle to (m) which was 0.68m...
19. ### Mechanics, conservation of momentum

A block of mass 3kg travelling at 5m/s catches up another block of mass 7 kg travelling at 2 m/s along the same line and in the same direction. A) if after the collision the second block has increased its speed to 3 m/s, what is the speed of the first block? B) you are given that the difference...
20. ### Rotation matrices and exponential map for angular momentum

Hi guys, I'm having some trouble with rotation matrices. Basically, this is the problem: Let R(na) be a matrix in SO(3), where na specifies the rotation the matrix represents. Namlely, n is the unit vector about which the rotation is performed, and a is the angle of the rotation. Let...