10th Edition

ISBN: 9781118230725

Author: David Halliday, Robert Resnick, Jearl Walker

Publisher: Wiley, John & Sons, Incorporated

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Textbook Question

Chapter 12, Problem 53P

SSMIn Fig 12-63, a rectangular slab of slate rests on a bedrock surface inclined at angle θ = 26°. The slab has length L = 43 m, thickness T = 2.5 m, and width W = 12 m, and 1.0 cm³ of it has a mass of 3.2 g. The coefficient of static friction between slab and bedrock is 0.39. (a) Calculate the component of the gravitational force on the slab parallel to the bedrock surface. (b) Calculate the magnitude of the static frictional force on the slab. By comparing (a) and (b), you can see that the slab is in danger of sliding. This is prevented only by chance protrusions of bedrock. (c) To stabilize the slab, bolts are to be driven perpendicular to the bedrock surface (two bolts are shown). If each bolt has a cross-sectional area of 6.4 cm² and will snap under a shearing stress of 3.6 × 10⁸ N/m². what is the minimum number of bolts needed? Assume that the bolts do not affect the normal force.

Chapter 12, Problem 53P, SSMIn Fig 12-63, a rectangular slab of slate rests on a bedrock surface inclined at angle = 26. The

Figure 12-63 Problem 53.

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Chapter 12, Problem 52P

Chapter 12, Problem 54P

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