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ω = 1200 rpm = 1200x 2π/60 rad/s = 40π rad/s
ditanyakan :
T =?
f = ?
jawab :
ω = 2π/T
40π = 2π/T
T = 2π/40π
T = 0,05 s
f = 1/T
f = 1/0,05
f = 20 Hz