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Homework Help: Mass supported by two strings

  1. Nov 13, 2011 #1
    1. The problem statement, all variables and given/known data
    A mass of 17kg is supported statically by two strings. T2 has a magnitude of 150N at β=45° to the right of the vertical. (a)Calculate the vector T1. (b) If T2 was acting vertically downwards with the same magnitude as in (a) calculate T1.


    2. Relevant equations
    0=T1sinα-T2sinβ
    0=T2cosβ+T1cosα-mg


    3. The attempt at a solution
    I calculated T1 for the first part and found it to be 122.1N at 60.31° to the left of the vertical. I'm not sure how to do the second part.
     
  2. jcsd
  3. Nov 13, 2011 #2
    I got the same answers for part 1 as you did.
    If T2 is acting vertically downwards with a tension of 150N then it seems to me that T1 must be acting vertically upwards if these are 2 STRINGS supporting a mass !
     
  4. Nov 13, 2011 #3
    I'm still not sure how you go about solving for T1 then.
     
  5. Nov 13, 2011 #4
    I would say that T1 is now providing the upwards force to hold the 17kg mass plus the 150N downwards force caused by T2
    So (9.81 x 17) + 150
     
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