A water balloon is thrown from a dormitory window that is above level ground. The balloon's initial velocity is directed above the horizontal. How much work is done by the gravitational force on the water balloon during its flight to the ground

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask

wavelegth as in spectrum red oygbiv