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d=20 cm ->R=10 cm (R=jari-jari)
f=5 Hz
DIT:
ω=?
v=?
JWB
*ω=2πf
ω=2.3,14.5
ω=31,4 rad/s
karena garis singgung maka;
*v=2πRf
v=31,4.10
v=314 m/s