The Greeks noticed that some stars were larger and moved haphazardly. What were these stars?

What happens in a global convection cell

Anybody wanna ? (picture included? )

Two point charges are on the y axis. a 3.90-µc charge is located at y = 1.25 cm, and a -2.4-µc charge is located at y = −1.80 cm. (a) find the total electric potential at the origin. v (b) find the total electric potential at the point whose coordinates are (1.50 cm, 0). v