Calcula la fuerza de fricción que mantiene a una persona de 75 kg sentada en la orilla de una plataforma giratoria horizontal, cuando la persona se encuentra a 2 m del
centro de la plataforma y tiene una rapidez tangencial de 3 m/s. Ahora calcula el
momento angular.

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the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."

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conservation of mass

mass before something happens = mass afterwards