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a rigid structure consisting of a circular hoop of radius R and mass m, and a square made of four thin bars, each of length R and mass m. The rigid structure rotates at a constant speed about a vertical axis, with a period of rotation of 1.0 s.
(a) Assuming R = 0.30 m and m = 1.0 kg, calculate the structure's rotational inertia about the axis of rotation
(b) What is its angular momentum about that axis?
A 50.0-kg child stands at the rim of a merry-go-round of radius 2.10 m, rotating with an angular speed of 3.60 rad/s. What is the child's centripetal acceleration
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