En un estadio de futbol se encuentra una pantalla gigante que sube y baja durante el show de medio tiempo. Si la pantalla provoca una fuerza de 29x103 N y debe elevarse 15 m en 45 segundos para poder jugar sin problemas. ¿Cuál es la potencia que necesita el motor para realizar dicha actividad?​

b.a device that inputs heat into a cool object

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.