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hi not sure if my answers are correct can u write the answer and explanations for these? 9. The equation of a vibrating object is

hi not sure if my answers are correct can u write the answer and explanations for these?

9. The equation of a vibrating object is x = 12 cos 27(0.20)t meters. (a) What is the amplitude of vibration? Q= (b) What is the frequency? (c) What is the period? 6= 0.20 Hz C = 50

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