7. Six identical disks of mass 2 kg and radi 1 as shown. Disks and hoops of iden

Question

7. Six identical disks of mass 2 kg and radi 1 as shown. Disks and hoops of identical radius to the initial disks are dropped onto the wheels. The mass of the disks and hoops are indicated. Rank the final angular velocity of the wheels from greatest to least. If several have the same rank, then place them in the same blank. us .5 m are rotating with an angular velocity of 45s A. B. C. Disk m=1kg Disk m1 = 2 kg ! Hoop m=2kg D. E. Hoop m=3kg Hoop m= 1kg Disk m 3 kg Greatest 1 Or, they all have the same rank Or, the rank cannot be determined from the given information Least Carefully explain your reasoning

Explanation / Answer

initial angular momentum Li = Ii*wi = I**wi

after combining final angular momentum Lf = If*wf = 2*I*wf

since If = 2*Ii

from momentum conservation

Lf = Li

2*wf = wi

wf = wi/2 = 4.5/2 = 2.25 rad/s

hear the final speed is not depending on mass and radius

they all have same rank <<<<----------ANSWER

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