There is a circuit with 2 resistors in series and a cell of 3.0v. what is the resistance across the first resistor if the current through it is 0.2a and pd across 2.0v
also whats the pd for second circuit?

Ten students stand in a circle and are told to make a transverse wave. what best describes the motion of the students? each student bumps the shoulder of his or her neighbor. at the exact time, all students take a step to the right. the students skip clockwise, going in a circular motion. one at a time, each student lifts his or her hands up and then down.

If a simple machine reduces the strength of a force, what must be increased?

The illuminance of a surface varies inversely with the square of its distance from the light source. if the illuminance of a surface is 120 lumens per square meter when its distance from a certain light source is 6 meters, by how many meters should the distance of the surface from the source be increased to reduce its illuminance to 30 lumens per square meter?