1. VINOTH KUMAR K/ Asst Prof/RMKCET
An electric light fixture weighing 15 N hangs from a point C, by two strings AC and BC. The string AC is inclined at 60° to the horizontal and BC at 45° to the horizontal as shown in Fig. Find the tension in the strings at A and B
FREE BODY DIAGRAM
T BC
T AC
W=15 N
T BC
T AC
75o
45o
30o
45o
60o
135o C
150o
W=15 N
VINOTH KUMAR K/ Asst Prof/RMKCET

2. VINOTH KUMAR K/ Asst Prof/RMKCET
FREE BODY DIAGRAM
Applying Lami’s theorem
W=15 N
75o
150o
135o
T BC
T AC C
45o
30o
60o
T BC
T AC
W=15 N W
Sin 75o
TAC
Sin 135o
TBC
Sin 150o W
Sin 75o
TAC
Sin 135o 15
Sin 75o
TAC
Sin 135o W
Sin 75o
TBC
Sin 150o
VINOTH KUMAR K/ Asst Prof/RMKCET