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Hi, I'm new to the forum. Help please

  1. Apr 20, 2010 #1
    1. The problem statement, all variables and given/known data

    A 3.80 kg block is in equilibrium on an incline
    of 38.4◦.
    The acceleration of gravity is 9.81 m/s2 .
    What is Fn of the incline on the block?
    Answer in units of N.

    2. Relevant equations



    3. The attempt at a solution

    FgsinΘ=mgsinΘ=3.8*9.81*sin38.4°=24.04
    FgcosΘ=mgcosΘ=3.8*9.81*cos38.4°=28.49

    This is from an online assignment. The second equation should've given me the correct value, but when I input the answer, the system tells me it's incorrect. Could anyone enlighten me on this situation? Maybe I'm doing something wrong. Please I would appreciate a quick reply. Thank you.
     
  2. jcsd
  3. Apr 20, 2010 #2

    ideasrule

    User Avatar
    Homework Helper

    I get 29.21.
     
  4. Apr 20, 2010 #3
    Oh hehe I must've made a mistake while calculating. Thank you very much. It's correct.
     
  5. Apr 20, 2010 #4

    berkeman

    User Avatar

    Staff: Mentor

    I get the same as ideasrule. You have both of your answers off, so there must be something wrong with the way you are typing them into the calculator.

    Also, I'm not sure what you mean by FgcosΘ=mgcosΘ. What is Fg? You should probably write it as:

    F=mgcosΘ
     
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