Force System Resultants Moments Chapter 4 (Hibbeler Statics 14th Edition) Engineers Academy

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Engineering Statics by Hibbeler 14th Edition
Chapter 4: Force System Resultants
Force System Resultant Moment

4–22. Old clocks were constructed using a fusee B to drive the gears and watch hands. The purpose of the fusee is to increase the leverage developed by the mainspring A as it uncoils and thereby loses some of its tension. The mainspring can develop a torque (moment) Ts = ku, where k = 0.015 Nm/rad is the torsional stiffness and u is the angle of twist of the spring in radians. If the torque Tf developed by the fusee is to remain constant as the mainspring winds down, and x = 10 mm when u = 4 rad, determine the required radius of the fusee when u = 3 rad.

Moment about a point

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