1. Se observa que la mayor parte de las galaxias del universo se alejan de nuestro sistema de referencia. La galaxia del Sombrero está emitiendo luz con una longitud de onda
de 700nm. a) Si la galaxia se aleja con una velocidad de 90000 km/s ¿Cuál es la
frecuencia percibida en la Tierra? b) Si la galaxia se acerca con una velocidad de
90000 ¿Cuál es la frecuencia percibida en la Tierra?


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.

Which of the following is the best name for mgcl2

Consider two less-than-desirable options. in the first you are driving 30 mph and crash head-on into an identical car also going 30 mph. in the second option you are driving 30 mph and crash head-on into a stationary brick wall. in neither case does your car bounce off the thing it hits, and the collision time is the same in both cases. which of these two situations would result in the greatest impact force?