tolong bantu dong nomor 4

VEKTOR
• resultan

KASUS KHUSUS
F₁ = 80 N
F₂ = 60 N
α = 90°

jawaban
R = 100 N, tripel Pythagoras
α₁ = 37°, α₂ = 53°, ∆siku² 3,4,5


atau

BESAR R
R² = F₁² + F₂² + 2 F₁ F₂ cos α
R² = 80² + 60² + 2•80•60•0
R² = 6400 + 3600 + 0
R² = 10000
R = √10000 = 100 N ←

ARAH R
tan α₂ = F₁ / F₂ = 80/60 = 4/3
α₂ = 53° ←
dan α₁ = 90° - α₂ = 37° ←