Electromagnets are used in all kinds of electric devices, including hard disk drives, speakers, motors, and generators, as well as in scrap yards to pick up heavy scrap metal. They're even used in MRI machines, which utilize magnets to take photos of your insides!
<span>To know if there were other factors that affected the volume of a gas, Genaris and her classmates should: </span>"formulate a new hypothesis with the same dependent variable but a different independent variable as the original hypothesis." In this case, the dependent variable is the volume of the gas and the new independent variable is a factor they think will affect the volume of the gas.
We use the formula, to calculate the average speed of the round trip,
Here, 
, is total distance covered by plane in total time, 
.
For the round trip,
.
Thus,
.
The correct answer is :
B. the value of q is positive.
Hope this helps,
Davinia.
