Which of the following is true regarding units of geologic time?
a.
eras are divided into periods; periods are divided into epochs.

b.
epochs are divided into periods; periods are divided into eras.

c.
periods are divided into epochs; epochs are divided into eras.

d.
eras are divided into epochs; epochs are divided into periods.

In physics the desire of an object to keep doing what it is doing is termed?

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

Física: un futbolista patea hacia el arco con una velocidad de 15m/ah, calcular: a)el alcance para un ángulo de tiro de 25º, b) el tiempo que el balón permanece en el aire.