How much energy is required to move an electron through a potential difference of 12 V?

1) 1.9 x 10^- 18 )
2) 7.5 x 10^- 18 )
3) 1.3 x 10^-20)
4) 7.5 x 10^18 J

Ineed with these last two questions: 1) what are two types of cold air masses that influence the weather in north america? name them and describe their humidity. 2) describe the motion of a cold air mass and a warm air mass and the weather you would expect at a warm front and an occluded front.

In what direction does the medium move relative to the direction of the wave? explain.

Atrain departs from its station at a constant acceleration of 5 m/s. what is the speed of the train at the end of 20s?