• Support PF! Buy your school textbooks, materials and every day products Here!

Physics Help Pleaase

  • Thread starter help444
  • Start date
  • #1
3
0
Physics Help!! Pleaase

Homework Statement



A mass, m, traveling at a speed v, strikes another mass = 2m at rest. After the collision, the first mass, m, is delfected through 45 degrees and has a final speed of v/2.
Find the speed and Direction of the mass 2m after this collision.

Homework Equations


p =mv



The Attempt at a Solution



2mfsinT = -mv/2sin 45
mv+2m+ 0 - mv xdr
mv = mv/2cos45+2mfcosT

Anyone help ..
 

Answers and Replies

  • #2
hage567
Homework Helper
1,509
2
I'm guessing you are trying to use conservation of momentum. What is f? What is xdr? Why do you only have a 2m there in the second line? Actually, that second line isn't even an equation! You need to start by drawing a diagram and breaking it up into x and y components, before the collision and after.
 
  • #3
3
0
I'm guessing you are trying to use conservation of momentum. What is f? What is xdr? Why do you only have a 2m there in the second line? Actually, that second line isn't even an equation! You need to start by drawing a diagram and breaking it up into x and y components, before the collision and after.
I have
let theta of missing angle = x
v2 = velocity of second mass , 2m
cos45mv/2 + cosX = mv
sin45mv/w= sin X 2Mv2
I can't solve it now..
 
  • #4
hage567
Homework Helper
1,509
2
"cos45mv/2 + cosX = mv"

There should be a term for the velocity of the 2m mass in front of the cosX.

"sin45mv/w= sin X 2Mv2"

I'm assuming the w is really a 2??

Everything looks OK I think. You have two equations and two unknowns (not counting the v that is the initial velocity). So put the second equation in terms of one of the unknowns and plug it into the first equation. Solve for that unknown.
 

Related Threads on Physics Help Pleaase

  • Last Post
Replies
2
Views
2K
Top