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Please help! Somple Work-energy problem

  1. Mar 19, 2009 #1
    Please help! Somple Work-energy problem!!

    Sam works at an amusement park. A boat of children on a water ride comes the the pier at the end of the ride. They are moving at a constant speed of 1.2 m/s, and the loaded boat has a mass of 1200kg. Sam slows the boat down by pushing on it until it comes to rest at the pier. If he stops it in a distance of 1.75m, and his arms make a 30o angle above the horizontal,

    * a) how much work did Sam do on the boat?
    * b) how large a force did he apply to the boat?


    I thought if I added the mass X gravity that would five me force.
    Then I took F cos theta X s to get 1.51 J
    and the foce would be 11760.

    I am not sure if that is right.
     
  2. jcsd
  3. Mar 19, 2009 #2
    Re: Please help! Somple Work-energy problem!!


    Why would you make two threads within an hour and a half of each other.

    Perhaps anyone viewing this should go to

    https://www.physicsforums.com/showthread.php?t=300950

    I would also advice [for the sake of not being deleted] that you should probably only make one post on each topic and refine from there.

    I am not a moderator, just a regular member trying to give you some friendly advice.

    Thanks :smile:
     
  4. Mar 19, 2009 #3
    Re: Please help! Somple Work-energy problem!!

    Wow you are so helpful thanks! :)
     
  5. Mar 19, 2009 #4

    Evo

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    Staff: Mentor

    Re: Please help! Somple Work-energy problem!!

    Rha1828, it is against Forum policy to start duplicate threads.
     
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