What is wind energy?
a. any natural resource that cannot be replaced in a reasonable amount of time
b. kinetic energy caused by the movement of particles at the atomic level of which the sun is the ultimate source on the planet
c. the conversion of kinetic energy created by moving waves into a source of energy
d. the conversion of kinetic energy created by the movement of gasses into a useful form of energy

1. a net force of 100 newton’s is applied to a wagon for 5 seconds. this causes the wagon to undergo a change in momentum of

Awater slide of length l has a vertical drop of h. abby's mass is m. an average friction force of magnitude f opposes her motion. she starts down the slide at initial speed vi. use work-energy ideas to develop an expression for her speed at the bottom of the slide. then evaluate your result using unit analysis and limiting case analysis. express your answer in terms of the variables h, m, l, vi, f and appropriate constants. vf v f

Most of the volume of an atom is occupied by the