Which is a good example of a contact force? A. protons in the nucleus of an atom B. a ball falling down after it's thrown up into the air C. a satellite orbiting Earth D. a bat hitting a ball

B

Explanation:

Because a ball falling down is a good strong force

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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