1.A flat belt drive consists of two cast-iron pulleys, each 4 feet in diameter, spaced 15 feet apart, center-to-center. The belt is to be made of two-ply oak-tanned leather, each ply being inch thick, and the specific weight of the leather material is 0.040 lb/in3 . The application involves a water-spray environment in which the belt is constantly subjected to the water spray (see Appendix Table A.1 for coefficients of friction). It has been experimentally determined that the tensile stress in the belt should not exceed 300 psi for safe operation. If 50 horsepower is to be transmitted at a pulley speed of 320 rpm, what belt width should be specified?

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