A 108 N lamp is hung up with two ropes that each make 20º angles with the horizontal. What's the tension in the ropes? What's the tension if the angle is 60º?

I answered the problem a while ago. Here is the copy of my answer:

With symmetry, apply Newton's second law in vertical direction:

2Tsinθ = mg

T = 108/(2sinθ)

θ = 20

^{o}, T = 158 Nθ = 60

^{o}, T = 62.4 N