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Knowing a pendulum's length precisely lets a physicist measure the local acceleration due to:
AGrinding
BGrouping
CGuidance
DGravity
Answer & Solution
Correct answer: D. Gravity
1. The period depends on just length and one other quantity.
2. With length and period measured, that quantity can be found.
3. It is the acceleration due to gravity.
_Source: OpenStax College Physics 2e, Chapter 16, Oscillatory Motion and Waves._
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