Question: A flat block is pulled along a horizontal flat surface by a horizontal rope perpendicular to one of the sides. The block measures (1.0 mathrm{~m}

A flat block is pulled along a horizontal flat surface by a horizontal rope perpendicular to one of the sides. The block measures $1.0 \mathrm{~m} \times 1.0 \mathrm{~m}$, has a mass of $100 \mathrm{~kg}$ and a constant velocity of $1.0 \mathrm{~m} / \mathrm{s}$, and is separated from the flat surface by a $0.10-\mathrm{cm}-$ thick oil layer of $15{ }^{\circ} \mathrm{C}$ SAE 20 crankcase oil. Find the coefficient of sliding friction for the block. Does this coefficient of friction change with the velocity?

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