Iron Has a Density of 7

question 99

Multiple Choice

Iron has a density of 7.87 g/cm³. What mass of iron would be required to cover a football playing surface of 120 yds * 60 yds to a depth of 1.0 mm (1 inch = 2.54 cm; 1 lb = 453.6 g)

• A) 6.4 * 10³ lb
• B) 6.4 * 10⁴ lb
• C) 1.0 * 10⁵ lb
• D) 4.7 * 10⁷ lb
• E) 4.7 * 10⁸ lb

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