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2973.1. Gravitation, friction and deformation.

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It is known, if a cubic is on a table, then it does not falls through it due to normal reactions, which pushes the cubic with the same force. Determine slide friction coefficient between cubic and table, if cubics mass is 4 kg and it is evenly pushed with 20 N big force. Gravity acceleration on earth assumed as 10m/s^2.
Strength and safety
Gravitation, friction and deformation.

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