Consider the equilibrium of the entire system.
C is the pin joint, making the free body diagram of ball and rod separately.
2RN cos 60° = 500 ...(i)
RN = 500K N
RA + RB = 500 N ...(ii)
Due to symmetry RA = RB = 250 N
CP = 0.5 cot 30° = 0.866 m
Taking moment about point C
T × 1.8 cos 30° – RN × CP – RB × 1.2 sin 30° = 0
T × 1.8 cos 300 = RN × CP + RB × 1.2 sin 30°
Putting the value of CP, RN, and RB
T = 374N.
