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Jawaban:
R = 474,9 N
Penjelasan:
FBA = k.qB.qA/rBA²
FBA = 9.10⁹. 18.10⁻⁶. 4.10⁻⁶/0,04²
FBA = 405 N
FBC = k.qB.qC/rBC²
FBC = 9.10⁹. 18.10⁻⁶. 10.10⁻⁶/0,08²
FBC = 253,125 N
Cari lebih dulu cosinus sudut antara FBA dan FBC
9² = 8² + 4² - 2. 8. 4. cos θ
81 = 64 + 16 - 81.cos θ
cos θ = - 1/81
Resultan Gaya
R² = FBA² + FBC² + 2.FBA.FBC. cos θ
R² = 405² + 253,125² + 2. 405. 253,125. (-1/81)
R² = 225567.2656
R = √225567.2656 = 474,9 N