(a) For a fiber-reinforced composite, the efficiency of reinforcement η depends on fiber length l according to

Where x represents the length of the fiber at each end that does not contribute to the load transfer. Make a plot of η versus l to l =50 mm (2.0 in.), assuming that x =1.25 mm (0.05 in.).
(b) What length is required for a 0.90 efficiency of reinforcement?

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