A rod of iron of uniform density has a thickness such that a one-inch-long segment of it weighs 3.88 ounces. Given that there are 0.035273 ounces in a gram and 2.54 centimeters in an inch, how many grams would a 14.79 cm length of the same iron rod weigh?

First convert the rod’s length to inches: 14.79 ÷ 2.54 ≈ 5.823 inches. At 3.88 ounces per inch, that length weighs about 5.823 × 3.88 ≈ 22.59 ounces. Since 1 gram is 0.035273 ounces, convert ounces to grams by dividing: 22.59 ÷ 0.035273 ≈ 640.51 grams. The correct choice is 640.51 g.

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