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Solid mechanics

Chapter 10 Notes

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Simple harmonic motion
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Chapter 10 Simple Harmonic Motion and Elasticity 10.1 The Ideal Spring and Simple Harmonic Motion spring constant Units: N/m 10.1 The Ideal Spring and Simple Harmonic Motion Example 1 A Tire Pressure Gauge The spring constant of the spring is 320 N/m and the bar indicator extends 2.0 cm. What force does the air in the tire apply to the spring? 10.1 The Ideal Spring and Simple Harmonic Motion 10.1 The Ideal Spring and Simple Harmonic Motion Conceptual Example 2 Are Shorter Springs Stiffer? A 10-coil spring has a spring constant k. If the spring is cut in half, so there are two 5-coil springs, what is the spring constant of each of the smaller springs? 10.1 The Ideal Spring and Simple Harmonic Motion HOOKE?S LAW: RESTORING FORCE OF AN IDEAL SPRING

Chapter 9 sol

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Chapter 9 Page 9.1 9 Solids and Fluids PROBLEM SOLUTIONS 9.1 The elastic limit is the maximum stress, F A where F is the tension in the wire, that the wire can withstand and still return to its original length when released. Thus, if the wire is to experience a tension equal to the weight of the performer without exceeding the elastic limit, the minimum cross-sectional area is 2minmin 4 D F mgA elastic limit elastic limit ?? ? ? and the minimum acceptable diameter is ? ? ? ? ? ? ? ? 2 3min 8 4 70 kg 9.8 m s4 1.3 10 m 1.3 mm5.0 10 Pa mgD elastic limit? ? ?? ? ? ? ?? 9.2 (a) In order to punch a hole in the steel plate, the superhero must punch out a plug with cross- sectional area, csA , equal to that of his fist and
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