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Crank
3 years ago
5

Zinc has a density of 0.258 lb/in³ (pounds per cubic inch).

Mathematics
1 answer:
ollegr [7]3 years ago
5 0

For this case we have that by definition the mass is given by:

m = D * V

Where,

  • <em>D: density </em>
  • <em>V: Volume </em>

The volume of a pyramid is given by:

V = \frac {1} {3} * A * h

Where,

  • <em>A: area of ​​the base </em>
  • <em>h: height </em>

Substituting values ​​we have:

V = \frac {1} {3} * (36) * (2.5)\\V = 30

We now calculate the mass:

m = (0.258) (30)\\m = 7.74\ lb

Answer:

he needs 7.74 pounds of zinc

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