MathDB
2008 USNCO Local #3: Thickness of aluminum foil

Source:

December 3, 2012

Problem Statement

A student wishes to determine the thickness of a rectangular piece of aluminum foil but cannot measure it directly. She can measure its density (d)(d), length (l)(l), mass (m)(m) and width (w)(w). Which relationship will give the thickness?
<spanclass=latexbold>(A)</span>mdlw<spanclass=latexbold>(B)</span>mlwd<spanclass=latexbold>(C)</span>dlwm<spanclass=latexbold>(D)</span>dmlw<span class='latex-bold'>(A)</span>\hspace{.05in}\frac{m}{d \cdot l \cdot w} \qquad<span class='latex-bold'>(B)</span>\hspace{.05in}\frac{m \cdot l \cdot w}{d} \qquad<span class='latex-bold'>(C)</span>\hspace{.05in}\frac{d \cdot l \cdot w}{m} \qquad<span class='latex-bold'>(D)</span>\hspace{.05in}\frac{d \cdot m }{l \cdot w} \qquad