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diketahui : t = 2 s
ω₁ = 4 rad/s
ω₂ = 20 rad/s
a = 1,6 m/s²
ditanya : R = .... ?
dijwab :
a = R x (ω₂ - ω₁) / t
1,6 = R x (20 - 4) / 2
1,6 = 8R
R = 0,2 m = 20 cm
Jawaban : E
14.
diketahui : α = 0,21 rad/s
θ = 1 putaran = 2π rad = 6,24
ditanya : ω = .... ?
dijawab :
ω = √(2 . α . θ)
= √(2 . 0,21. 6,24)
ω = 1,6 rad/s
Jawaban : A
Nomor 15
diketahui : v arus = 4 m/s
v perahu = 3 m/s
x = 180 m
ditanya : S = ... ?
dijawab :
mencari waktu :
t = x / v perahu
= 180 / 3
t = 60 s
mencari resultan kecepatan
v = √(4² + 3²)
v = 5 m/s
mencari jarak yang ditempuh
S = v . t
= 5 . 60
S = 300 m
Jawaban : C