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wab = 18 N
wb = 30 N
sin α = 3/5
Resultan momen gaya terhadap titik A
Στ = 0
T sin α × L = wab × ½L + wb × L
T sin α = ½ wab + wb
T (3/5) = ½ • 18 + 30
T (3/5) = 39
T = (5/3) 39
T = 65 N ← jwb
Gaya tegangan tali T = 65 N