A steel beam of mass M is moved over a level surface using a series of rollers of diameter D for which the coefficient of rolling resistance is age at the ground and as at the bottom surface of the beam. Determine the horizontal force P needed to push the beam forward at a constant speed. Hint: Use the result of Prob. 8–131.

Units Used:

Mg = 1000 kg

Given:

M = 1.2 Mg

D = 30 mm

ag = 0.4 mm

as = 0.2 mm

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