2) Una pieza de un motor tiene forma de un disco sólido uniforme de masa de 155 gramos y radio de 3 cm, y gira alrededor de un eje sin fricción que pasa por su centro, pero, en, en un punto en el exterior su superficie, roza contra un metal, lo que le produce una fuerza de fricción de 0.3 N en ese punto. a) Calcule su aceleración angular. 20% b) ¿Cuánto tiempo requerirá para disminuir su rapidez rotacional en 33 rad/s? 20%.​

Antireflective coatings on solar cells are often made by applying a thin film of silicon nitride (sinx), which has an index of refractive of 1.2, on the top of the silicon solar cell, which has a refractive index of about 3.5. however, the sun emits radiation of various wavelengths which the solar cell absorbs, and the antireflective coating can only absolutely minimize the reflection of one of these wavelengths. the coating thickness is chosen to reduce the reflection of green/yellow light (e = 2.2 ev), which is the most intense color in the solar spectrum (shown below). which of the following coatings would minimize reflection of green/yellow light? the answer is 820 nm how? what is the angular width of the central maximum of an electron traveling at 2 x 108 m/s going through a single slit of width 1 mm.