Why are airbags important for safety? What could happen if the pressure was too high or too low?

Which uses electromagnetic radiation to discover the properties and composition of bodies in space? space probe space station space shuttle space observatory

When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change?

An atom of sodium-23 (atomic number = 11) has a positive charge of +1. give this information, how many electrons does it have? how many proteins and neutrons does this atom have