¿Alguien me puede ayudar por favor? ¿Alguien me puede hacer esta actividad? Nombra los siguientes óxidos según la nomenclatura de composición con prefijos numerales y la de composición con números de oxidación.

CoH
NaH
CuH
PbH4
SbH3
CaH2
SnH2
NiH3

If the force on an object is in the negative direction, the work it does on the object must be [2 points a) negative. b) positive c) the work could be either positive or negative, depending on the direction the object moves

Two identical stars with mass m orbit around their center of mass. each orbit is circular and has radius r, so that the two stars are always on opposite sides of the circle. (a) find the gravitational force of one star on the other. (b) find the orbital speed of each star and the period of the orbit. (c) how much energy would be required to separate the two stars to infinity?

Which of the following list the divisions of the geologic time scale in order from longest to shortest