Dados tres vectores en coordenadas polares, determinar las coordenadas polares de un cuarto vector D, de tal manera que la suma de A+B+C+D=0 a. <80m, 170º>
b. < 90m, 280º>
c. <110, 70º>
d. <?,?>

The summit of chimborazo, in ecuador, which is at a distance of about 6,384 km from the earth's center. the bottom of the mariana trench, in the western pacific ocean, which is nearly 6,370 km from the center of the earth. on the surface of earth on the equator line.

Spend time observing or thinking about events that involve matter and energy. which events can you explain? which events can’t you explain?

What is the fate of the electrons that interact with a specimen in an electron microscope?