A composite has a matrix of polyester with Kevlar-29 fibers. The Kevlar fibers have a modulus of elasticity of 67.6 GPa in the longitudinal direction and 4 GPa in the transverse direction. The polyester matrix has a modulus of elasticity of 3.12 GPa in both directions. In order to achieve a 24 GPa modulus of elasticity in the longitudinal, you should find the volume fraction ratio of Kevlar fibers added into the composite. Determine the fraction of the load supported by Kevlar fibers

Ajournal bearing has a journal diameter of 3.250 in with a unilateral tolerance of 20.003 in. the bushing bore has a diameter of 3.256 in and a unilateral tolerance of 0.004 in. the bushing is 2.8 in long and supports a 700-lbf load. the journal speed is 900 rev/min. find the minimum oil film thickness and the maximum film pressure for both sae 20 and sae 20w-30 lubricants, for the tightest assembly if the operating film temperature is 160°f. a computer code is appropriate for solving this problem.

At 12 noon, the count in a bacteria culture was 400; at 4: 00 pm the count was 1200 let p(t) denote the bacteria cou population growth law. find: (a) an expression for the bacteria count at any time t (b) the bacteria count at 10 am. (c) the time required for the bacteria count to reach 1800.

Carbon dioxide gas expands isotherm a turbine from 1 mpa, 500 k at 200 kpa. assuming the ideal gas model and neglecting the kinetic and potential energies, determine the change in entropy, heat transfer and work for each kilogram of co2.