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Help in some phy problems

  1. Mar 16, 2009 #1
    Hi everybody,

    I have 3 problems, and I need help to know the steps to solve them =)

    Problem N.1 :

    http://www.alamuae.com/up/uplong/Problem1117531470314431.gif

    ..........................................

    Problem N.2

    ...........................................


    Problem N.3

    http://www.alamuae.com/up/uplong/problem2117533441086710.gif


    Thanks to All ^___^
     
  2. jcsd
  3. Mar 16, 2009 #2
    You need to make and effort and show some work on these before you can be helped, Sarah. Please post what you have done, and then we can help you.
     
  4. Mar 16, 2009 #3
    Dr.D

    First of all, thanks for your responce.

    For the fisrt problem:

    a) the free body diagram
    http://www.alamuae.com/up/uplong/pro-1-freebody117650654032943.gif

    b) I don't know the direction of the force of friction, it is ( F sin 30 ) or ... ?

    c) I think, F = ma
    a = F sin(30) / m

    then, I did't know what should I do. -.-

    d) at the rest, v(initial) = 0

    x = [ v(initial)*t ] + [ 0.5 *a * t^2 ]

    but first, I should calculet the acceleration with 2kg.


    .................

    The second problem:

    a) The direction of the acceleration will be with the bigger force. Is this true?

    .....

    I will continue tomorrow ^^
     
  5. Mar 16, 2009 #4
    You need to start off by

    1) reviewing the rules for drawing FBDs
    2) reviewing resolution of forces into components
     
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