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Jawaban:
Diketahui : F1 = 12 N F2 = 10 N F3 = 8 N Ditanya: R = ...???
R2 = √ ZFx² + EFy2
F1 = 12 N F1x = 12 x cos 30°
F1x = 12 x 1/2√3
F1x = 6V3
N F1y = 12 x sin 30°
F1y = 12 x 12 = 6 N
F2 = 10 N
F2x = 0 N
F2y = -10 N
F3 = -8 N
F3x = -8 x sin 60°
F3x = -8 x 1/2√3 = 4√3 N
F3y = -8 x cos 60°
F3y = -8 x cos 60°
F3y = -8 x 1/2 = -4 N
ΣFx = F1x + F2x - F3x
ΣFx = 6√3 + 0-4√3
ΣFx = 2√3 N
ZFy = F1y - F2y - F3y
ZFy = 6 - 10 -4
MFy = -8 N
R2 = √ ΣFx² + EFy2
R² = √ (2√3)2 + (-8)2
R2 = √ 12+ 64
R2 = √76 R = √76 N (B)
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