Michael Phelps completed the 100meter butterfly in 50.77 seconds. How fast was his speed in km/hr? how about in miles per hour?
this year's Olympics (41 years

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

Aquantity of that isotope to decay to 1/2 of  its original value