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Diketahui :
F = 10 satuan
α = 30
ditanyakan
Fy = ?
Jawab:
Fy = F sin α
Fy = 10 sin 30
Fy = 10 x 1/2 = 5 satuan
8.
Diketahui :
p =60
q = 80
Ιp+qΙ = 100
Ditanyakan :
α = ?
Jawab :
Ιp+qΙ² = p²+q² + 2pq cosα
100² = 60² + 80² + 2(60)(80) cos α
10000 = 3600 + 6400 + 9600 cos α
10000 - 10000 =9600 cos α
0 = 9600 cos α
cos α = 0
α = 90°