12. A shaft is supported in two bearings 8 ft. apart and projects 2 ft. beyond the bearings at each end. The shaft carries three pulleys, one at each end and one at the middle of its length. The end pulleys weigh 180 lb. and 100 lb. and their centres of gravity are at 0-15 and 0-20 in. respectively from the shaft axis. The centre pulley weighs 140 lb. and its centre of gravity is 0-25 in. from the shaft axis. If the pulleys are arranged so as to give static balance, determine the dynamic forces produced on the bearings when the shaft rotates at 300 r.p.m.

12. A shaft is supported in two bearings 8 ft. apart and projects 2 ft. beyond the bearings at each end. The shaft carries three pulleys, one at each end and one at the middle of its length. The end pulleys weigh 180 lb. and 100 lb. and their centres of gravity are at 0-15 and 0-20 in. respectively from the shaft axis. The centre pulley weighs 140 lb. and its centre of gravity is 0-25 in. from the shaft axis. If the pulleys are arranged so as to give static balance, determine the dynamic forces produced on the bearings when the shaft rotates at 300 r.p.m.

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter9: Moments And Products Of Inertia Of Areas

Section: Chapter Questions

Problem 9.16P: Figure (a) shows the cross-sectional dimensions for the structural steel section known as C1020...

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