ME 221 Statics

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ME 221 StaticsLecture 21Sections 9.7 - 9.9
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Homework 7

• Chapter 4 problems
• 52, 53 54
• Chapter 9 problems
• 2, 3, 4, 11, 23, 29 32
• Use double integration for 2, 3, 4 11
• Due today

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Homework 8

• Chapter 9 problems
• 42, 43, 50 55
• Chapter 5 problems
• 11, 13, 16, 20, 24 25
• See Blackboard for additional information
• Due Wednesday, October 30

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Exam 2 Results

• Average score 81
• Scores posted on Blackboard
• Solution posted on Blackboard
• See syllabus for regrade policy

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Last Lecture

• Principal Second Moments
• Product Moment of Inertia
• Principal Axes
• Mohrs Circle

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Mechanics Nomenclature

• Polar Moment of Inertia Torsional Stiffness
• Second Moment of Area Bending Stiffness

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Product Moment of Inertia

• Basic section with two axes of symmetry

• Composite sections - product parallel axis theorem

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Mohrs Circle for Principal Inertia
Angles in Mohrs circle are twice those in the
section analyzed.
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Chapter 9 Examples
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Guest SpeakerEngineering Study Abroad Program

• Dr. Darren Mason
• Albion College (formerly at MSU)
• Engineering in Russia
• Summer 2003