What are basic units, give basic S. I units? ​

Arotating space station is said to create “artificial gravity”—a loosely-defined term used for an acceleration that would be crudely similar to gravity. the outer wall of the rotating space station would become a floor for the astronauts, and centripetal acceleration supplied by the floor would allow astronauts to exercise and maintain muscle and bone strength more naturally than in non-rotating space environments. if the space station is 200 m in diameter, what angular velocity would produce an “artificial gravity” of 9.80 m/s^{2} 2 at the rim?

Multiply or divide to make this english distance conversion. 174 inches = feet (14.5, 58, 2,088, 23)

If you put a helium-filled balloon in the refrigerator, what will happen?