Why does the evaporation of sweat cool down your skin?

Which notation is used to represent an alpha particle? a. b. c. d.

The air that we breath is made mostly of which gaseous molecule

Aclarinetist, setting out for a performance, grabs his 3.350 kg clarinet case (including the clarinet) from the top of the piano and carries it through the air with an upward force of 24.65 n. find the case's vertical acceleration. indicate an upward acceleration as positive and a downward one as negative.