P = 28.4 Newton – the weight of a piece of metal;
g = 10 Newton / kilogram – acceleration of gravity;
V = 400 cubic centimeters = 0.0004 cubic meters – the volume of a piece of metal.
It is required to determine what kind of metal it is.
Find the mass of a piece of metal:
m = P / g = 28.4 / 10 = 2.84 kilograms.
Then the density of the metal is:
ro = m / V = 2.84 / 0.0004 = 7100 kilograms per cubic meter.
From the table of metal densities, we find that this density corresponds to zinc.
Answer: The piece is made of zinc.
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