Discuss what ageing biases you have witnessed &/or perpetrated.
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What are some of the important limitations of the epidemiologic approach with respect to the study of environmental health problems? 
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Bearing A is a cylindrical roller and is to take onlyradial load; bearing B is to take the thrust load of 220 lbf produced by the helical gear and itsshare of the radial load.

A shaft is to be designed to support the spur pinion and helical gear shown in the figure ontwo bearings spaced 28 in center-to-center. Bearing A is a cylindrical roller and is to take onlyradial load; bearing B is to take the thrust load of 220 lbf produced by the helical gear and itsshare of the radial load. The bearing at B can be a ball bearing. The radial loads of both gearsare in the same plane, and are 660 lbf for the pinion and 220 lbf for the gear. The shaft speedis 1150 rev/min. Design the shaft. Make a sketch toscale of the shaft showing all fillet sizes,keyways, shoulders, and diameters. Specify the material and its heat treatment.(forgive me ,but their is afigure but its in this bookMechanical EngineeringMcGraw-Hill PrimisISBN: 0-390-76487-6Text:Shigley’s Mechanical Engineering Design,Eighth EditionBudynas-Nisbett page 399)

 

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