Los clavadistas de la “quebrada de Acapulco” se lanzan horizontalmente desde una plataforma rocosa, que está aproximadamente a 35 m sobre el
agua; sin embargo, ellos deben librar protuberancias rocosas al nivel del mar,
que se extienden hasta 5 m desde la base del acantilado directamente debajo
su punto de lanzamiento.
a) ¿Cuánto tiempo permanecen en el aire?
b) ¿Qué rapidez mínima inicial es necesaria para lograrlo?

The ratio of lift to drag l/d for a wing or airfoil is an important aerodynamic parameter, indeed, it is a direct measure of the aerodynamic efficiency of the wing. if a wing is pitched through a range of angle of attack, l/d first increases, then goes through a maximum, and then decreases. consider an infinite wing with an naca 2412 airfoil. estimate the maximum value of l/d. assume that the reynolds number is 9x10^6.

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

A1-lb collar is attached to a spring and slides without friction along a circular rod in a vertical plane. the spring has an undeformed length of 5 in. and a constant k =25 lb/ft. knowing that the collar is released from being held at a determine, the speed of the collar and the normal force between the collar and the rod as the collar passes through b.