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# What coefficient of friction is needed to keep the 5-kg block A from sliding on the... What coefficient of friction is needed to keep the 5-kg block A from sliding on the horizontal surface? The mass of block B is 3 -kg.

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Answer #1

Let the Coefficient of kinetic friction be uk .

Tension in the string, T = 3.0 * 9.8 = 29.4 N

For Block A not to slide,
Fr = T
uk*5.0*9.8 = 29.4
uk = 0.6

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