Answer:
F1 = 1210.65 N
Q = 65.7081 degrees
Step-by-step explanation:
Sum of Forces in x - direction:
F1 * cos (Q) + F2*sin(30) - F3*(3/5) = Fres*cos (theta)
F1 * cos (Q) + (500)*(0.5) - 450*(3/5) = 570*cos(33)
F1*cos (Q) = 498.0422237 N .... Eq1
Sum of Forces in y - direction:
F1 * sin (Q) - F2*sin (60) - F3 * (4/5) = Fres*sin (theta)
F1 * sin (Q) - 500*sin(60) - 450 * (4/5) = 570*sin (33)
F1 * sin (Q) = 1103.45692 N .... Eq 2
Divide Eq 2 by Eq 1
tan (Q) = 2.21558916
Q = arctan (2.21558916) = 65.7081 degrees
F1 = 1210.65 N