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Man standing on a scale

  1. Jan 5, 2017 #1
    1. The problem statement, all variables and given/known data
    Man standing on scale and pulling on a rope connected to two pulleys

    2. Relevant equations
    The mass of the man is: m=100 kg

    The weight of the pulleys, cables, balance, and the frictions are not taken into account

    g=10m x s-2

    3. The attempt at a solution


    the force that the man should draw in order to maitain balance:
    T1=250 N

    The weight displayed on the scale:
    P= 125 kg

    Other tensions:
    T2=250 N
    T3=500 N
    T4=500 N
    T5=1000 N

    Do your agree with that ?
    Thank you..
     

    Attached Files:

    Last edited: Jan 5, 2017
  2. jcsd
  3. Jan 5, 2017 #2
    You have not laid out the question properly ... what information is given in the question?
     
  4. Jan 5, 2017 #3
    You just have to validate or not thes values (T1, P, T2, T3, T4, T5)
     
  5. Jan 5, 2017 #4

    haruspex

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    I agree with all the tensions, but I do not understand how you got 125kg for the scale reading. Consider again which way the forces act on the man.
     
  6. Jan 5, 2017 #5
    I'm not convinced either
    I thought about it..
     
  7. Jan 5, 2017 #6
    Yes I agree there is something wrong

    What do we know for sure ? ....T1= T2 and T3 =T4 ...... 4xT1 = 2xT4 = T5 and T5 is supporting all the mass = 100kg = 1000N ... so all the tensions are correct .

    The weight indicated on the scale must be the man's weight , minus the the pull from T1 .... 1000 - 250 = 750N scale should indicate 75Kg not 125kg
     
  8. Jan 5, 2017 #7
    Yes you are right :check:

    Thank you.. it's cool :oldbiggrin:
     
  9. Jan 5, 2017 #8

    haruspex

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    This is a homework forum. We point out errors, provide hints, explain principles.... We do not post solutions.
     
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