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Determine the force P needed to pull the 55-kg roller over the smooth step. Take θ = 30°. | Homework.Study.com
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The person using the track with the rollers uses less energy to load the box because the rollers - Brainly.com
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The rollers on the sides of the block keep it from moving horizontally. The pins that the rollers rotate on are frictionless. The coefficient of friction between all rollers and the block
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