Who discovered the exosphere, and when?

Henry, whose mass is 95 kg, stands on a bathroom scale in an elevator. the scale reads 830 n for the first 2.4 s after the elevator starts moving, then 930 n for the next 2.4 s. part a what is the elevator's speed 4.8 s after starting? express your answer with the appropriate units.

The heliocentric and the geocentric models of the solar system included these central principles

What part of the ear is names after tools, such as the hammer and the anvil?