Find the length of a pendulum that oscillates with a frequency of 0.15 hz.

The 'period' of a simple pendulum is

Time = 2 π · √ (pendulum's length) / (acceleration of gravity)

Time = 1/frequency = 6.67 seconds

g = 9.81 m/s²

Stuff those numbers into the formula, and you get

Pendulum's length = 11.04 meters

unable to answer the rest since your question is incomplete

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