What does it mean to control variables

Ascrew incorporates which other simple machine? lever wheel and axle inclined plane pulley

Which of the following is an example of motion in two dimensions?

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