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ef152-lec-3-5 - center of mass is 14 cm from the hole at...

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EF 152 Spring, 2009 Lecture 3-5 2 Example: EF Harp We want to build a harp by hanging 4 people (130 lb, 150 lb, 170 lb, and 190 lb) in the Estabrook atrium. Each of them is hanging from a 0.125 inch diameter steel wire that is 10 ft long. (density of steel = 500 lb/ft 3 ) What is the fundamental frequency of each wire? EF 152 Spring, 2009 Lecture 3-5 3 Gondola cable A steel gondola cable weighs 975 kg and has a length of 625 m. When a transverse wave is sent along the cable it takes 16.5 seconds to return. What is the tension in the cable? EF 152 Spring, 2009 Lecture 3-5 4 Physical Pendulum You do three experiments with a 21 cm long wrench. 1. You balance the wrench and determine the wrench’s
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Unformatted text preview: center of mass is 14 cm from the hole at the end. 2. You hang the wrench from a spring that has a constant of 360 N/m and the spring stretches 3.2 cm. 3. You hang the wrench from hook, displace the wrench 11° from the vertical, release the wrench, and determine the period of motion is 0.90 sec. Determine the mass moment of inertia about the hook, and about the center of mass. EF 152 Spring, 2009 Lecture 3-5 5 SHM The design of a timing mechanism requires that a mass of 3.2 grams undergo 6 oscillations per second when it is attached to a spring. What is the required spring constant?...
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