Robert L. answered • 03/20/20

Experienced Certified Physics Instructor, all levels, HS, AP, College

The vertical component of tension must equal to the weight due to balanced force in the y-direction.

Therefore Tcos(30) = 100, T = 100/cos(30) = 200/sqrt(3) approximately 115 N tension

The horizontal component of tension must balance the air current force (F) due to balanced force in the x-direction

Therefore Tsin(30) = F(air current), F = 0.5 T , F = 100/sqrt(3) approximately 58.7 N air current force