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ID: 1774999 • Letter: C
Question
Course Home physics.com/myct/itemView?assignmentProblemID-811778488offset-next Home Work 10 Problem 8.72 previous | 7 of 12 net Problem 8.72 Part A A uniform disk turns at 3.1 rev/s around a frictionless central axis. A nonrotating rod, of the same mass as the disk and length equal to the disk's diameter, is dropped onto the freely spinning disk(Figure 1). They then turn around the spindle with their centers superposed What is the angular frequency in rev/s of the combination? Express your answer using two significant figures. Figure 1 of 1 rev/s Submit My Answers Give Up Type here to search 0 OExplanation / Answer
L1 = L2
0.5mr^2*w1 = (0.5mr^2 + mr^2/3)*w2
w2 = 0.5mr^2w1/(0.5mr^2 + mr^2/3)
= 0.5w1/(0.5 + 1/3)
= 0.5*3.1/(0.5 + 1/3)
= 1.86 rev/s Answer