2.19. Devil´s, Vorobyyov

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2.19. On a horizontal surface there is a whetstone weight = 2 kg. The coefficient of friction of whetstone about a surface is equal 0,2. On whetstone there is other whetstone weight = 8 kg. The coefficient of friction of the top whetstone about the lower is equal 0,3. To the top whetstone force is applied. To define: 1) value of force at which will begin joint sliding of whetstones on a surface; 2) value of force at which the top whetstone will start sliping rather lower.

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