1. The problem statement, all variables and given/known data Each of the three cables can safely carry a maximum tension force of 7.2kN. Based on this criterion, what is the largest safe mass of the suspended ceiling? 2. Relevant equations Sum of forces=0 Sum of moments=0 3. The attempt at a solution I drew this for the FBD: I then tried to solve this by just summing all forces in the y-direction to get 'mg': 7.2kN*3-mg=0 m=2201.83kg, which isn't right. So then I tried doing it by finding the moment about some arbitrary point (O): [tex]\sum[/tex]M0=-14*7.2i+5*7.2k+12*7.2k-7.2*7i-4Wk+8Wi=0 From which: -14(7.2)-7.2(7)+8W=0 W=18.9kN and from 5*7.2+12*7.2+4W=0 W=30.6 So those don't even give me the same value... What am I doing wrong? Wrong assumption about all tensions being 7.2kN?