el tiempo record mundial actual de la carrera de 200m bajo techo es de 19.92s y lo conserva frank fredericks de namibia (1996), mientras que el tiempo del record en ola carrera de una milla bajo techo es de 228.5 obtenido por hichman el guerrouj, de marruecos (1997). encuentre la rapidez media en metros por segundo que corresponde a estos tiempos record para a) el evento de 200m y b) para el evento de una milla.

In an old-fashioned amusement park ride, passengers stand inside a 3.0-m-tall, 5.0-m-diameter hollow steel cylinder with their backs against the wall. the cylinder begins to rotate about a vertical axis. then the floor on which the passengers are standing suddenly drops away! if all goes well, the passengers will “stick” to the wall and not slide. clothing has a static coefficient of friction against steel in the range 0.60 to 1.0 and a kinetic coefficient in the range 0.40 to 0.70. part a what is the minimum rotational frequency, in rpm, for which the ride is safe? express your answer using two significant figures. f f = rpm