Today earths magnetic field is losing approximately 7 percent of its strength every 100 years. if the strength of earth magnetic field at its surface is 0.5 gauss today, what will it be 100 years from now?

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