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r=42 cm dan 150 putaran tiap menit.
dit:kecepatan..?
jawab:
1 menit=60 s
rumus periode atau T:
sehingga,
T=60
150
T=0,4
cari kecepatan,rumusnya,
v=2(3,14).(0,42)
0,4
v=6,59 ----->6,6 m/s (pembulatan)