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QUESTION 1  two cylindrical rollers are placed in contact with one other [bigger one with diameter "D" placed first and smaller one with diameter "d"afterwards] on a horizontal plane. A force is appplied on the top most point of the bigger roller. the friction cofficient  "µ" has same value for all sufaces. Determine limits of µ so that the larger roller can be pulled over smaller one.                ANSWER   µ≥√D/d




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