Spherical silica particles (100 nm in diameter) are added to vulcanized rubber in tires to improve stiffness.

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Spherical silica particles (100 nm in diameter) are added to vulcanized rubber in tires to improve stiffness. If the density of the vulcanized rubber matrix is 1.1 g/cm3, the density of silica is 2.5 g/cm3, and the tire has a porosity of 4.5%, calculate the number of silica particles lost when a tire wears down 0.4 cm in thickness. The density of the tire is 1.2 g/cm3; the overall tire diameter is 63 cm; and it is 10 cm wide.
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Essentials of Materials Science and Engineering

ISBN: 978-1111576851

3rd edition

Authors: Donald R. Askeland, Wendelin J. Wright

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