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(newton's 2nd & 3rd laws) finding mass

  1. Nov 12, 2011 #1
    A mass is hanged by 2 cables, the first makes 30° with the ceiling while the second makes 60° with the ceiling. Find the attached mass if the first tension is 24.5 N and the second tension is 42.7 N.

    my way:
    T1=24.5N θ=30
    T2=42.7N θ= -60
    m=?
    m=Fnet/a

    the ans should be (m=5.017 Kg)
     
  2. jcsd
  3. Nov 12, 2011 #2
    How many forces act on the mass?
     
  4. Nov 12, 2011 #3
    3 forces
    Fg and 2 tension forces
     
  5. Nov 12, 2011 #4
    Now find the vertical components of the two tensions.
     
  6. Nov 12, 2011 #5
    T1: 24.5 sin 60=21.21N
    T2: 42.7 sin 30=21.35N
     
  7. Nov 12, 2011 #6
    If you draw a diagram you will notice that the above are the HORIZONTAL components.

    (Incidentally, the horizontal components must be equal in magnitude)
     
  8. Nov 12, 2011 #7
    yes, your right.
     
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