Escribe verdadero o falso : a) la primera derivada en la funcion de desplazamiento representa fisicamente la velocidad media.
b) al calcular la segunda derivada en la funcion de desplazamiento se determina la aceleracion instantanea.
c)al calcular la derivada de la funcion f(×)=2xa la n 4+12 resulta 8x4
d)la derivada de la funcion f(x)=2x a la n es f(x)=n2x a la n.

Which statement correctly describes a step-up transformer? a. it increases the amount of electric energy available. b. it increases the voltage of an electric current. c. it changes direct current into alternating current. d. it has more loops of wire in its primary coil.

World class speed skaters can skate a 3,000-m course in about 4 minutes.what is their average speed for this course? a. 12.5 m/sb. 1.33 m/sc. 1.25 m/sd. 13.3 m/s

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