A ship travels north at 15 km/h for 2 h. What is the ship's displacement in km?

Iron reacts with sulfur to form iron sulfide. if 60 grams of iron reacts with sulfur to produce 90 grams of iron sulfide, how much sulfur has been used in the chemical reaction?

Pls pls pls pls ! describe, in your own words, how you found the epicenter of the earthquake.

The electric potential a distance r from a small charge is proportional to what power of the distance from the charge? a. r^-1 b. r c. r^-2 d. r^2