Find the average speed of a person who swims 105 m in 70 s

The answer is c. 320 g

The correct answer should be "electrons orbit the nucleus in circular motions exactly as shown on the classic bohr model."

The atomic nucleus made up from protons (yellow) and neutrons (blue) and held together by nuclear forces. nuclear forces (also known as nuclear interactions or strong forces) are the forces that act between two or more nucleons. they bind protons and neutrons (“nucleons”) into atomic

1) according to the law of conservation of mass ,in all chemical reactions total mass is unchanged