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Homework Help: I Need More Help

  1. Oct 20, 2004 #1
    HERE IS ANOTHER qUESTION.....I GOT THE FIRST PART RIGHT BUT I CAN'T GET PART B RIGHT. PLEASE HELP
    A 12-pack of Omni-Cola (mass 4.30 kg) is initially at rest on a horizontal floor. It is then pushed in a straight line for 1.60 m by a trained dog who exerts a horizontal force with magnitude 37.5 N.
    (a) Use the work-energy theorem to find the final speed of the 12-pack if there is no friction between the 12-pack and the floor.
    5.28 m/s
    (b) Use the work-energy theorem to find the final speed of the 12-pack if the coefficient of kinetic friction between the 12-pack and the floor is 0.30.
    ? m/s
     
  2. jcsd
  3. Oct 20, 2004 #2

    Pyrrhus

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    Homework Helper

    Work energy Theorem

    [tex] \sum W = \Delta K [/tex]

    [tex] W_{dog} - W_{friction} = \frac{1}{2}mv^2 [/tex]
     
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