Recent content by rachelx46

  1. R

    Can Elastic Collisions Be Solved Quickly with Minimal Steps?

    so apparently, this problem usually would require, many hours, and quite a few pages to write a proof for this, but today, i was shown a way to solve it in only a few mintues with only a few steps... an object of mass m collides elastically with a second object of equal mass initially at...
  2. R

    Projectiles launched horizontally

    ahh I am completely lost now i tried to isolate teh unknwon (t) from the rest of the problem and got t= the square root of 2(delta y)/-g but the book says that is only for when delta y is negative. can someone explian this problem to me step by step? I am reallly confused.
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    Projectiles launched horizontally

    well, would it be .809=-1/2(g)(t)squared, what else are you supposed to do with this? like where does the horizontal displacement go
  4. R

    Projectiles launched horizontally

    okay so here's the problem.. the fastest recored pitch in MLB was thrown by nolan ryan in 1974. if this pitch were thrown horizontally, the ball would fall 0.809 m by the time it reached the home plate, 18.3 m away. how fast was this pitch? the book suggests the equation delta y =...
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