Question

Determine the stresses of the light bar and support wire

Answer 1

Tbar = Tension of the Light Bar

Twire = Tension of the Wire

Newton First Law About Force :

Fx = 0

Tbar cos 45° - Twire cos 25° = 0

Twire = 0.78 Tbar ... (i)

Fy = 0

Tbar sin 45° - Twire sin 25° - 1 = 0 ... (ii)

Subtitute (i) into (ii) :

Tbar sin 45° - 0.78 Tbar sin 25° - 1 = 0

Tbar = 2.563 kN ... (iii)

Subtitute (iii) into (i) :

Twire = 0.78 (2.563)

Twire = 1.999 kN