The quartz crystal in a digital watch has a frequency of 32.8 kHz. What is its period of oscillation?

A) 9.71 B) 15.3 C) 95.8 D)95. 8 E) .191

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Find the period of oscillation : The quartz crystal in a digital watch has a frequency of 32.8 kHz. What is its period of oscillation? |

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## What percent of the volume of the wood is above surfaceGalaxies form by gravitational collapse of regions that are denser than average. Noting that the present day average mass density of the universe is ρ = 3 × 10-30 g/cm-3, estimate how long it takes for a galaxy to collapse. |

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