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a) The coefficient of kinetic friction between a steel block and an ice rink surface is 0.0100. If a force of 24.5 N keeps the steel block moving at a steady speed, what is the force of gravity on the block?

b)A copper block has dimensions 1 cm × 2 cm × 4 cm. A force of 0.10 N will pull the block along a table surface at a steady speed if the 1 cm × 4 cm side is face down on the table. What force will be needed to pull the same block along when its 2 cm × 4 cm side is face down?

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