Which describes the reaction of a substance to form one or more new substances? a physical change

a chemical change

a change of state

True or false graphs must include scales that increase by the same amount

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

To a of 4 x hz is 1. 0. mm nm nm