Unknown force

Question

An unknown force works in 28° degrees with the horizontal. The vertical component of the unknown force is determined to be 80 N. the value of the unknown force. choose: (A) 169.5 N (B) 170.4 N (C) 170 N

Answer 1

Fsinθ = F_y ⇒

 

F = F_y/sinθ = (80 N)/sin28° ≅ 170.4 N