Online HW 08 Begin Date: 10/28/20175 1/10/2017 5:00:00 PM End Date: 1/102017 5:0
ID: 1775274 • Letter: O
Question
Online HW 08 Begin Date: 10/28/20175 1/10/2017 5:00:00 PM End Date: 1/102017 5:00:00 PM (10%) Problem 9: A playground rev/s. me ry g und with a mass of 145 kg and a radius of 1 9 m is rotating with a frequency of 0 54 m 145 kg 22 kg 54 r=1.9m what is the magnitude of its ang lar velocity, in a ans per second, after a 22kg child gets onto it by grabbing its o redge? The child is initially at rest. or= 2.411 Grade Summary Deductions 4% Potential 96% Completed Completed Attempts emaining: 3 per attemp Partial atan0 acotan0 sinh0 1 2 3. tanhO cotanhO Completed Completed Hint Partial CompletedExplanation / Answer
f = 0.54 rev/s = 0.54 x 2pi rad/s = 3.39 rad/s
Applying angular momentum conservation,
Li = Lf
(145 x 1.9^2 / 2) (3.39) = ((145 x 1.9^2 / 2) + (22 x 1.9^2)) w
w = 2.60 rad/s
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