How Much Does the Caboose Weigh After a Collision?

  • Thread starter Thread starter alaajassar
  • Start date Start date
  • Tags Tags
    Collision
alaajassar
Messages
1
Reaction score
0
Freight Car-Caboose Collision

Hi, I'm a new user here. i need a help with this question:

A 29000-kg railroad freight car collides with a stationary caboose car. They couple together, and 25 percent of the initial kinetic energy is dissipated as heat, sound, vibrations, and so on. What is the mass of the caboose?
 
Physics news on Phys.org
Welcome to PF!

Hi alaajassar! Welcome to PF! :wink:

Call the initial velocity u, and the final velocity v, and use conservation of momentum.

What do you get? :smile:​
 
Thread 'Need help understanding this figure on energy levels'

Thread 'Need help understanding this figure on energy levels'

This figure is from "Introduction to Quantum Mechanics" by Griffiths (3rd edition). It is available to download. It is from page 142. I am hoping the usual people on this site will give me a hand understanding what is going on in the figure. After the equation (4.50) it says "It is customary to introduce the principal quantum number, ##n##, which simply orders the allowed energies, starting with 1 for the ground state. (see the figure)" I still don't understand the figure :( Here is...
View full post »
Thread 'Understanding how to "tack on" the time wiggle factor'

Thread 'Understanding how to "tack on" the time wiggle factor'

The last problem I posted on QM made it into advanced homework help, that is why I am putting it here. I am sorry for any hassle imposed on the moderators by myself. Part (a) is quite easy. We get $$\sigma_1 = 2\lambda, \mathbf{v}_1 = \begin{pmatrix} 0 \\ 0 \\ 1 \end{pmatrix} \sigma_2 = \lambda, \mathbf{v}_2 = \begin{pmatrix} 1/\sqrt{2} \\ 1/\sqrt{2} \\ 0 \end{pmatrix} \sigma_3 = -\lambda, \mathbf{v}_3 = \begin{pmatrix} 1/\sqrt{2} \\ -1/\sqrt{2} \\ 0 \end{pmatrix} $$ There are two ways...
View full post »

Similar threads

Freight car-caboose collision finding mass without velocities
Replies
12
Views
10K
Conservation of energy/momentum
Replies
1
Views
2K
What Is the Mass of the Caboose After the Collision?
Replies
1
Views
4K
Ambiguous question on momentum and how it works...
Replies
13
Views
1K
What Is the Speed of Five Coupled Freight Cars After a Collision?
Replies
4
Views
2K
How Do You Determine Vehicle Speeds in Collision Analysis?
Replies
17
Views
5K
Collision Conservation of Energy
Replies
5
Views
1K
B Understanding Physics for Coding Collision of 2 Balls
Replies
14
Views
3K
Why Does Kinetic Energy Change After Collision in EENGA 2019 Question?
Replies
3
Views
1K
How much kinetic energy take the particles after the collision?
Replies
2
Views
2K

Hot Threads

Recent Insights

Back
Top