Estimate the number of liters of water a human drinks in a lifetime. suppose that a human drinks 2 l of water per day, and the approximate lifetime is 70 years.

What is the speed of an object at a given moment?

Explain why electric current cannot exist if a current doesn't have a voltage source.

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