Dos cargas muy pequeñas de masas iguales m y cargas iguales q están suspendidas del mismo
punto por hilos de igual longitud L. El sistema se mantiene
en equilibrio. a)Hallar la expresión que debe satisfacer el
ángulo a que cada hilo (de masa nula) forma con la vertical.
b)A partir de dicha expresión encontrar el ángulo a en
función de m, L y q cuando a < 5º. c)Encontrar algún
procedimiento para determinar el valor de α resolviendo la
ecuación obtenida en el ítem (a).

Photoelectrons with a maximum speed of 6.50 x 107 m/s are ejected from a surface in the presence of light with a frequency of 6.75 x 1014hz. if the mass of an electron is 9.10 x 10-31 kg, calculate in joules the maximum kinetic energy of a single electron. 3.84 x 10-15 j 1.92 x 10-15 j 5.92 x 10-23 j 3.07 x 10-16 j

The amount of work done is determined by 2 factors. describe an example of work (using the scientific definition) list the 2 factors that determine the amount of work done.

To place a communications satellite into a geosynchronous orbit at an altitude of 22,240 mi above the surface of the earth, the satellite first is released from a space shuttle , which is in a circular orbit at an altitude of 185 mi, and then is propelled by an upper-stage booster to its final altitude. as the satellite passes through a, the booster's motor is fired to insert the satellite into an elliptic transfer orbit. the booster is again fired at b to insert the satellite into a geosynchronous orbit. knowing that the second firing increases the speed of the satellite by 4810ft/s, determine (a.) the speed of the satellite as it approaches b on the elliptic transfer orbit, (b.) the increase in speed resulting from the first firing at a.