What iron gives in its abundance, it takes away in it's inability to really conduct heat and electricity well. There is enough copper around, if we are careful in its use, to make copper bottomed pots and pans. Of the three best conductors in the world (silver, gold and copper) only copper has enough around and can be inexpensively mined that we make use of it.
If you google dr. copper, you will find he is an economist as well. Copper measures the wealth of an economy by how much is used. So iron might be cheaper and more abundant, but copper will save you much more in trying to do something with it.
The vertical component of velocity is zero
P= density
v= volume
m= mass
p = m/v
p = 1896/3
p = 632
the density is 632
Distances in space could be measured in common units of length, such as miles or kilometers. But measuring such large distances in these common units creates some pretty big numbers. It's easier to measure distances in two alternate units of distance- light years and astronomical units.
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