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Problem 3
A unidirectional carbon-fiber-epoxy-resin composite contains 68 percent by volume of carbon fiber and
32 percent epoxy resin. The density of the carbon fiber is 1.79 g/cm³ and that of the epoxy resin is 1.20
g/cm?. (a) What are the weight percentages of carbon fibers and epoxy resin in the composite? (b) What
is the average density of the composite?

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