Jay wants to find out whether the number of turns of the wire around the steel rod affects the strength of the electromagnet. Which two set-ups below should she choose to conduct a fair test? 1) A and C only
2) A and D only
3) B and C only
4) B and D only

Light from the sun reaches the earth in 8.3 minutes. the velocity is 3.00 x 10^8 m/s. how far is earth from the sun? i know how to get to d = (3 x 10^8 m/s)(498 sec). i just don't know how to get from there to the answer being 1.5 x 10^11 m.

How to calculate voltage drop in a series circuit

Object a has a length of 3 cm, a width of 2 cm, and a height of 4 cm. object b is dropped into a graduated cylinder. it displaces 19 ml of water. the volume of object a is: a: greater than the volume of object b b: less than the volume of object b c: equal to the volume of object b