Answer:

Explanation:
As the 2 force directions are perpendicular (North vs West), we can calculate the magnitude of the net force using the following equation

Assuming negligible friction, from here we can calculate the acceleration in accordance to Newton's 2nd law of motion

It means every thing is made out of Atoms and some things are element componds so elements are the "backbone" of the compounds.
Temperature and pressure are directly proportional to each other. If this helps,please pick me the best. Also,please say thanks.
When it gets hot, rails expand. The gaps in the track allow for it to expand straight, but if there were no gaps, it could expand in unexpected directions, so it could be very dangerous for a train to go over it because they could be bent.