POR FAVOR AYUDA ESTOY EN UN QUIZ
Un niño empuja a su hermana pequeña en un trineo. El trineo acelera de 0 a 3,2 m / s. Si la masa combinada de su hermana y el trineo es de 40.0 kg y se generaron 18 W de potencia, ¿cuánto tiempo empujó el niño el trineo?

Two polarizers are oriented at 40∘ to each other and plane-polarized light is incident on them. if only 16 percent of the light gets through both of them, what was the initial polarization direction of the incident light?

The two required components for a generator

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