Figure 11-43 shows three rotating, uniform disks that are coupled by belts. One

Question

Figure 11-43 shows three rotating, uniform disks that are coupled by belts. One belt runs around the rims of disks A and C. Another belt runs around a central hub on disk A and the rim of disk B. The belts move smoothly without slippage on the rims and hub. Disk A has radius R; its hub has radius 0.471R; disk B has radius 0.221R; and disk C has radius 1.51R. Disks B and C have the same density (mass per unit volume) and thickness. What is the ratio of the magnitude of the angular momentum of disk C to that of disk B?

Explanation / Answer

the tangential velocity or the velocity of the belt is constant
so

a*0.471R=b0.221R

aR=c1.51R

c/b=0.221/0.471*1.51

ratio=0.310

pls rate ans is correct

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