anonymous
  • anonymous
An object with mass M moving North with speed V strikes an identical object with mass M moving East with speed V. Assuming a perfectly inelastic collision, what is the speed of either objects after collision what i did: mv+mv/ 2m = v but that's wrong... so i dont know what to do
Physics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
is the speed root of 2M?
anonymous
  • anonymous
v / rt 2
anonymous
  • anonymous
WAT IS r?

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anonymous
  • anonymous
v / sqrt 2
anonymous
  • anonymous
|dw:1327070380181:dw|in this case only momentum conservation can be applied as kinectic energy is not conserved
anonymous
  • anonymous
that gives the initial momentum
anonymous
  • anonymous
|dw:1327070682895:dw|final momentum=M(vel+vel) as vel of both are same after collision
anonymous
  • anonymous
how come KE isnt conserved?
anonymous
  • anonymous
because inelastic collision involves lose of mechanical energy(k.e or p.e) it may be converted to some other form of energy like heat
anonymous
  • anonymous
ohhhh, but in elastic collision, energy is conserved?
anonymous
  • anonymous
YA IT IS CONSERVED
anonymous
  • anonymous
remember ENERGY IS ALWAYS SAME ONLY TRANSFERRED FRM ONE FORM TO ANOTHER
anonymous
  • anonymous
okay, got it, thanks! how did you get m(v+v) ?
anonymous
  • anonymous
i thought momentum conservation was m1v1 + m2v2 = m1v1f + m2v2f
anonymous
  • anonymous
ya that is wat i did here
anonymous
  • anonymous
initial momentum=final momentum
anonymous
  • anonymous
how did you get v sqrt 2?
anonymous
  • anonymous
OHHHHHH
anonymous
  • anonymous
NEVERMIND!!!! i get it, thanks sooo much again, you seriously helped a lot, especially since my final is in 1 hour...
anonymous
  • anonymous
how do you know when momentum is conserved?
anonymous
  • anonymous
when no external force acts here and in all collisions there is no external force in the system just transfer of enegy
anonymous
  • anonymous
so all collisions have its momentum conserved? even with a block attached to a spring and another block collides and sticks to it?
anonymous
  • anonymous
yes there it is plastic collision as the block sticks to the other just look for initial and final cases after collision ask urself is there only the initial force thta was given acting? thats it
anonymous
  • anonymous
what does the answer to the question mean?
anonymous
  • anonymous
when a body starts to move then it hits some other body,u just considert whether there is any external force acting on these bodies other than the initial force that was given for those bodies to move....
anonymous
  • anonymous
does air resistance count as an external force? last thing, i swear! how do you know when to use momentum conservation and energy and which to use first?
anonymous
  • anonymous
yes air resistance is an external force
anonymous
  • anonymous
for elastic collisions momentum and energy conserved for inelastic only momentum is conserved
anonymous
  • anonymous
okay, i think i got it now. thank you so much again! i really appreciate it!
anonymous
  • anonymous
no problem ALL THE BEST!

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