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First year Dynamics

  1. Jan 13, 2010 #1
    1. The problem statement, all variables and given/known data
    Small Steel balls fall from rest through the opening at A at the steady rate of two per second. Find the vertical separation h of two consecutive balls when the lower one has dropped 3 meters.


    2. Relevant equations
    all kinematics equations


    3. The attempt at a solution
    I found the time it took for 1 ball to reach 3m which was 0.782 seconds, lost from here
     
  2. jcsd
  3. Jan 13, 2010 #2

    Dick

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    Ok, so the lower one was dropped 0.728s ago and is 3m down. Then the upper one was dropped half a second earlier. Where is it?
     
  4. Jan 13, 2010 #3
    so then, i go 0.782/2 is the time for the second ball?
     
  5. Jan 13, 2010 #4

    Dick

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    Nooo! 0.782s-(1/2)s. It was dropped 1/2 second earlier. They are falling at a rate of 2/second. Think about it.
     
  6. Jan 13, 2010 #5
    ohhh that makes sense, thanx
     
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