Physics · GRAVITATION

Why is the historical Cavendish experiment often famously described as an experiment to 'weigh the Earth'?

1. A
   Cavendish measured the buoyant force exerted by the Earth's atmosphere on large lead spheres.
2. B
   Cavendish measured the orbital period of the Moon using optical methods.
3. C
   Cavendish directly measured the mass of the Earth using a giant mechanical balance.
4. D
   Measuring the universal constant \( G \) alongside known surface \( g \) and Earth's radius \( R_E \) allowed the determination of Earth's mass \( M_E \).