Directions: On this worksheet you will practice reading vibration graphs and correctly answering questions based on its period and frequency.

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Question 1 The teal-graph shown below tracks the vibrations of a pendulum using a sonic ranger. You are given that the first crest occured at 4.6 seconds and the last crest occured at 12.7 seconds.Based on the first crest, how many complete vibrations are shown on the graph?

10.5 9.5 10.75 9 10

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Question 2 What was the pendulum's period?

8.1 x 10^{0} seconds1.11 x 10^{0} hz8.1 x 10^{-1} seconds1.23 x 10^{0} hz9 x 10^{-1} seconds

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Question 3 What was the pendulum's frequency?

1.23 x 10^{0} hz1.11 x 10^{0} hz9 x 10^{-1} seconds8.1 x 10^{-1} seconds

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Question 4 Based on the time of the first crest, how many complete vibrations would have taken place in 30 seconds had the sonic ranger continued recording?