Conservation of Momentum problem-don't understand the solution

AI Thread Summary
The discussion revolves around a conservation of momentum problem involving two pucks on an air-hockey table, where puck A collides with puck B, initially at rest. Puck A has a mass of 0.025 kg and a velocity of 5.5 m/s, while puck B has a mass of 0.050 kg. The challenge lies in determining the final speeds of both pucks post-collision, considering the angles at which they separate. Participants suggest that including a diagram and clarifying the equations used would aid in solving the problem. The thread emphasizes the importance of providing complete information to facilitate understanding and resolution of the physics problem.
skier07
Messages
8
Reaction score
0
[SOLVED] Conservation of Momentum problem-don't understand the solution

Homework Statement



The drawing shows a collision between two pucks on an air-hockey table. Puck A has a mass of 0.025kg and is moving along the x-axis with a velocity of 5.5m/s. It makes a collision with puck B, which has a mass of 0.050kg and is initially at rest. The collision is not head-on. After the collision, the two pucks fly apart with the angles shown in the drawing. Find the final speed of (a) puck A and (b) puck B.

Homework Equations






The Attempt at a Solution


X direction:


Y direction:






Plug into (2)
 
Physics news on Phys.org
More Information?

skier07 said:

Homework Statement



After the collision, the two pucks fly apart with the angles shown in the drawing.

...

Plug into (2)

No one has posted yet to help you but I think that you should include the drawing and demonstrate what equation (2) is exactly. The lack of information makes your problem difficult to solve...
 
I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
Thread 'Collision of a bullet on a rod-string system: query'
In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
Thread 'A cylinder connected to a hanging mass'
Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
Back
Top