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A disk like the lower one in Fig. 10-10 has I = 0.0150 kg·m2 and is turning at 3.0 rev/s. A trickle of sand falls onto the disk at a distance of 20 cm from the axis and builds a 20-cm radius ring of sand on it. How much sand must fall on the disk for it to slow to 2.0 rev/s? |
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