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Ignore the speed of sound?

  1. Apr 3, 2009 #1
    1. The problem statement, all variables and given/known data
    "A rock thrown horizontally at a large bell 50m away is heard to hit the bell 4.5 seconds later. If the speed of sound is 330m/s, what was the speed of the rock? (Disregard the effect of gravity.) [Hint: If it requires a time of t for the sound to return, then it requires (4.5 s-t) for the stone to reach the bell]


    2. Relevant equations

    v = d/t

    3. The attempt at a solution

    Would you completely disregard the speed of sound, and continue using the v= d/t?

    v = 50 / 4.5
    v = 11.1 m/s
     
  2. jcsd
  3. Apr 3, 2009 #2

    cristo

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    No, I would use the speed of sound, and the hint.
     
  4. Apr 3, 2009 #3
    how would you fit that into the forumla to find the speed of the rock?
     
  5. Apr 3, 2009 #4

    cristo

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    It tells you that if t is the time the sound takes to travel from the bell to your ear, then (4.5-t) is the amount of time the stone takes to travel to the bell.

    How can you calculate t, given the speed of sound and the distance travelled?
     
  6. Apr 3, 2009 #5
    v = d/t

    t= d/v
    (4.5-t) = 50/330

    ?
     
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