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Get Full Access to Mechanics Of Materials - 6 Edition - Chapter 8 - Problem 8.69
Get Full Access to Mechanics Of Materials - 6 Edition - Chapter 8 - Problem 8.69

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# Answer: Two 1.2-kip forces are applied to an L-shaped

ISBN: 9780073380285 142

## Solution for problem 8.69 Chapter 8

Mechanics of Materials | 6th Edition

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Mechanics of Materials | 6th Edition

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Problem 8.69

Two 1.2-kip forces are applied to an L-shaped machine element Review AB as shown. Determine the normal and shearing stresses at(a) point a, (b) point b, (c) point c.

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Calculations with Ka & Kb Values • for a conjugate acid-base pair, Ka x Kb = Kw, where Kw = 1.0 x 10^-14 at 25˚C ex. Is a solution of NH4HC2O4 at 25˚C acidic, basic, or neutral • Ka C2H2O4 = 5.6 x 10^-2 Kb NH3 = 1.8 x 10^-5 Solve for new Ka for NH4+ + H2O⁶NH3 + H3O+ Ka* = 1.0 x 10^-14 = 5.56 x 10^-10 *Use Ka* = Kw 1.8 x 10^-5 Kb Solve for new Kb for C2H2O4 + H2O⁶HC2H2O4+ + OH- Kb* = 1.0 x 10^-14 = 1.79 x 10^-13 *Use Kb* = Kw 5.6 x 10^-2 Ka Choose bigger K value 5.56 x 10^-10 > 1.79 x 10^-13 Since Ka* > Kb*, NH4HC2O4 is acidic (at 25˚C). • ex. Calculate pH of a 0.10 M NH4NO3 solution. Kb NH3 = 1.8 x 10^-5 NH4+(aq) + H2O(l) ⁶ NH3(aq) + H3O+(aq) I 0.10 M 0 M 0 M C -x +x +x E 0.10 - x x x Ka* = 1 x 10^-14 = 5.56 x 10^-10 1.8 x 10^-5 5.56 x 10^-10 = x^2 0.1 - x Neglect x 5.56 x 10^-10 (0.1) = x^2 x = 7.46 x 10^-6 7.46 x 10^-6 x 100 = 0.0075% < 5% ✓ 0.10 pH = -log[H3O+] = -log(7.46 x 10^-6) = 5.13

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##### ISBN: 9780073380285

This textbook survival guide was created for the textbook: Mechanics of Materials, edition: 6. The full step-by-step solution to problem: 8.69 from chapter: 8 was answered by , our top Engineering and Tech solution expert on 11/15/17, 02:40PM. The answer to “Two 1.2-kip forces are applied to an L-shaped machine element Review AB as shown. Determine the normal and shearing stresses at(a) point a, (b) point b, (c) point c.” is broken down into a number of easy to follow steps, and 29 words. Mechanics of Materials was written by and is associated to the ISBN: 9780073380285. Since the solution to 8.69 from 8 chapter was answered, more than 256 students have viewed the full step-by-step answer. This full solution covers the following key subjects: point, normal, element, forces, kip. This expansive textbook survival guide covers 11 chapters, and 1493 solutions.

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