An electric circuit can have no current when a switch is

Asher cycles 12 miles in 16 hours. what is his speed?

Scientists follow specific processes in order to determine valid explanations and conclusions from observations. david observed strange lights in the sky above his home outside of roswell, new mexico. the only explanation that makes sense to him is that there are ufos in the area. what should david do next to verify his explanation?

An atom that has gained or lost electrons is called an _