The 1.2-Mg steel beam is moved over a level surface using a series of 30-mm-diameter rollers for
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The 1.2-Mg steel beam is moved over a level surface using a series of 30-mm-diameter rollers for which the coefficient of rolling resistance is 0.4 mm at the ground and 0.2 mm at the bottom surface of the beam. Determine the horizontal force P needed to push the beam forward at a constantspeed.
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