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a) ω(t) = ω(0) + α . t
7π = 0 + α . 0,75
α = 28π/3 rad/s²
b) Δθ = ω(0) . t + ½.α.t²
Δθ = 0 + ½.(28π/3).(0,75)² = 2,625π radian
Banyak putaran = 2,625π / 2π = 1,3125 putaran
c) 180 rpm = 180 putaran/menit = 3 putaran/sekon = 3 Hz = f
ω = 2πf = 6π rad/s
Percepatan sentripetal: a_sp = ω² R = (6π)².0,12 = 4,32π rad/s²
Percepatan tangensial: a_T = α.R = (28π/3).0,12 = 1,12π rad/s²
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