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?

Why don't you see your reflection in water with waves or repples

Which subatomic particle has a negative charge

Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. the work done on object 1 is 900 j. after the force has pulled each object, object 1 moves twice as fast as object 2. how much work is done on object 2?