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Box being pulled up a ramp on

  1. Mar 2, 2009 #1
    1. The problem statement, all variables and given/known data
    Suppose a box on a frictionless ramp is being pulled by a rope with a tension of 350 N making an angle of 50° to the horizontal ground. If the angle of incline of the ramp is 20°, and the box is pulled 5 m, determine the amount of work done. Hint: Draw a diagram and use vectors to represent the situation.


    2. Relevant equations
    W=FdcosI


    3. The attempt at a solution
    AC/AB= cos20degress
    AC=ABcos20
    =350cos20degrees
    =39

    W=HdcosI
    = (5)(250cos20)
    =1644J

    The work done is 1644J

    Is this solution correct?
     
  2. jcsd
  3. Mar 4, 2009 #2
    There is a mistake in your last calculation although the solution is correct. This should have been posted in Introductory physics, as I assume this was for a physics class?
     
  4. Mar 4, 2009 #3
    Sorry I didn't know this was the wrong place to post. What is the mistake that I made?
     
  5. Mar 4, 2009 #4

    HallsofIvy

    User Avatar
    Staff Emeritus
    Science Advisor

    A typo- you have "250" rather than "350".:biggrin:
     
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