Un muchacho tira una pelota hacia abajo a -25,0 m/s desde la azotea de un edificio de 30,0 m. ¿Qué tiempo tarda la pelota en llegar al suelo y que velocidad final tiene?

Suppose a diode consists of a cylindrical cathode with a radius of 6.200×10^−2 cm , mounted coaxially within a cylindrical anode with a radius of 0.5580 cm . the potential difference between the anode and cathode is 260 v . an electron leaves the surface of the cathode with zero initial speed (v initial=0). find its speed vfinal when it strikes the anode.

Acertain radio station broadcasts radio waves that have a wavelength of 298cm what is its broadcast frequency?

The ability to make things happen is also called a. heat b. force c. matter d. energy