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A 2.5 kg block rests on a 30 ∘ slope and is attached by a string...

A 2.5 kg block rests on a 30 ∘ slope and is attached by a string of negligible mass to a solid drum of mass 0.70 kg and radius 3.6 cm , as shown in the figure (Figure 1) . When released, the block accelerates down the slope at 1.3 m/s2 . What is the coefficient of friction between block and slope?

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