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Thread: Physics problem

  1. #1
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    Physics problem

    I am very stumped with this problem and i would greatly appreciate some help:
    Gold, which has a density of 19.32 g/cm3, is the most ductile metal and can be pressed into a thin leaf or drawn out into a long fiber. (a) If a sample of gold with a mass of 7.637 g, is pressed into a leaf of 4.992 μm thickness, what is the area (in m2) of the leaf? (b) If, instead, the gold is drawn out into a cylindrical fiber of radius 2.300 μm, what is the length (in m) of the fiber?
    Last edited by mr fantastic; Aug 31st 2009 at 04:40 AM. Reason: Changed post title (removed the word calculus)
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by BiGpO6790 View Post
    I am very stumped with this problem and i would greatly appreciate some help:
    Gold, which has a density of 19.32 g/cm3, is the most ductile metal and can be pressed into a thin leaf or drawn out into a long fiber. (a) If a sample of gold with a mass of 7.637 g, is pressed into a leaf of 4.992 μm thickness, what is the area (in m2) of the leaf? (b) If, instead, the gold is drawn out into a cylindrical fiber of radius 2.300 μm, what is the length (in m) of the fiber?
    a) What is the volume of $\displaystyle 7.637 gm$ of gold (convert that into cubic metres)? What is the volume of $\displaystyle A$ square metres of gold $\displaystyle 4.992\times 10^{-6}$ metres thick?

    b) What is the volume of a cylinder of radius $\displaystyle 2.300 \times 10^{-6}$ metres and length (or height) $\displaystyle L$ metres?

    CB
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