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Kesetimbangan
Syaratnya adalah :
Σ⊤ A = 0
F • (R - h) - W • x = 0
F • (R - h) = W • x
F • (R - h) = W • √[R² - (R - h)²]
F • (R - h) = W • [R² - (R - h)²]^½
W • [R² - (R - h)²]^½
F = ________________
(R - h)
Jadi, besar gaya F minimum yang diperlukan adalah
W • [R² - (R - h)²]^½
F = ________________
(R - h)
Jawaban B