October 2020 1 42 Report
Uma roda gira com frequencia 1200 rpm. A frequencia e o periodo sao respectivamente:

a) 1200 Hz , 0,5 s
b) 60 Hz , 1 min.
c) 20 Hz , 0,5 s .
d) 20Hz , 0,5 s.
e) 12 Hz , 0,08 s.

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