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Cavendish's experiment was difficult because the attraction he measured was between two:
AOrdinary-sized markets
BOrdinary-sized masses
COrdinary-sized mirrors
DOrdinary-sized magnets
Answer & Solution
Correct answer: B. Ordinary-sized masses
1. Gravitation is by far the weakest of the fundamental forces.
2. Between laboratory objects the pull is tiny.
3. He measured the attraction between two ordinary-sized masses.
4. Those were tens of kilograms at most.
_Source: OpenStax College Physics for AP Courses 2e (CC BY 4.0), Ch 6 'Uniform Circular Motion and Gravitation', sections 6.1-6.6_
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