(a) The problem describes the time taken to execute one cycle of the motion. The period is T=0.754s.
(b) Frequency is simply the reciprocal of the period: f=1/T ≈1.3Hz, where the SI unit abbreviation Hz stands for Hertz, which means a cycle-per-second.
(c) Since 2π radians are equivalent to a cycle, the angular frequency ω (in radians per second) is related to frequency f by ω=2πf so that ω≈8.4rad/s.
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