Information is needed about the thickness of oil necessary to lubricate metal parts sliding down an inclined plane. A square metal part with 0.9 m sides that weighs 20 N is required to slide down the inclined plane shown, at a velocity of 20 cm/s. Neglecting edge effects, calculate the necessary thickness of oil, if μ = 5.43 × 10^–2 N^∙s/m².

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