Degarmo's Materials And Processes In Manufacturing

13th Edition

ISBN: 9781119492825

Author: Black, J. Temple, Kohser, Ronald A., Author.

Publisher: Wiley,

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Textbook Question

Chapter 8, Problem 3CS

The US Army helmet has evolved from sheet steel, to 29â€�layer Kevlar, to the current Kevlar/Twaron advanced combat helmet. The helmet liners have also changed from compressed paper fibers, plastic, and rayon to sophisticated suspensionâ€�webbing systems with chin straps. Exposure to brainâ€�injuring shock waves from explosions is a current concern. A variety of materials and designs have been proposed for helmet liner systems, including: airâ€� and fluidâ€�filled (water or glycerin) chambers, layered composites with interfaces that reflect some of the incoming energy, foamed or cellular materials, aerogel, solid glass beads, hollow glass beads, and others. Select several of these and discuss the related pros and cons.

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Chapter 8, Problem 2CS

Chapter 8, Problem 4CS

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100 As a spring is heated, its spring constant decreases. Suppose the spring is heated and then cooled so that the spring constant at time t is k(t) = t sin + N/m. If the mass-spring system has mass m = 2 kg and a damping constant b = 1 N-sec/m with initial conditions x(0) = 6 m and x'(0) = -5 m/sec and it is subjected to the harmonic external force f (t) = 100 cos 3t N. Find at least the first four nonzero terms in a power series expansion about t = 0, i.e. Maclaurin series expansion, for the displacement: • Analytically (hand calculations) Creating Simulink Model Plot solutions for first two, three and four non-zero terms as well as the Simulink solution on the same graph for the first 15 sec. The graph must be fully formatted by code.

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Two large tanks, each holding 100 L of liquid, are interconnected by pipes, with the liquid flowing from tank A into tank B at a rate of 3 L/min and from B into A at a rate of 1 L/min (see Figure Q1). The liquid inside each tank is kept well stirred. A brine solution with a concentration of 0.2 kg/L of salt flows into tank A at a rate of 6 L/min. The diluted solution flows out of the system from tank A at 4 L/min and from tank B at 2 L/min. If, initially, tank A contains pure water and tank B contains 20 kg of salt. A 6 L/min 0.2 kg/L x(t) 100 L 4 L/min x(0) = 0 kg 3 L/min 1 L/min B y(t) 100 L y(0) = 20 kg 2 L/min Figure Q1 - Mixing problem for interconnected tanks Determine the mass of salt in each tank at time t≥ 0: Analytically (hand calculations) Using MATLAB Numerical Functions (ode45) Creating Simulink Model Plot all solutions on the same graph for the first 15 min. The graph must be fully formatted by code.

Chapter 8 Solutions

Degarmo's Materials And Processes In Manufacturing

Ch. 8 - Discuss the termsÂ plasticsÂ andÂ polymers. In...Ch. 8 - What are some naturally occurring nonmetallic...Ch. 8 - What are some material families that would be...Ch. 8 - How might plastics be defined from the viewpoints...Ch. 8 - What is the primary type of atomic bonding within...Ch. 8 - What is the difference between a saturated and an...Ch. 8 - What is an isomer?Ch. 8 - Describe and differentiate the two means of...Ch. 8 - What is a mer?Ch. 8 - What is degree of polymerization?

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