Solve the following problem showing all work, the formula, and correct units.
the density of iron is known to be 7.874g/cm'. i have an bar of unknown metal with a mass of
2000g and a volume of 400cm. calculate the density of the bar. is it iron?

Aboat radioed a distress call to a coast guard station. at the time of the call, a vector a from the station to the boat had a magnitude of 45.0 km and was directed 15.0° east of north. a vector from the station to the point where the boat was later found is = 30.0 km, 15.0° north of east. what are the components of the vector from the point where the distress call was made to point where the boat was found? in other words, what are the components of vector c = b - a?