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# lecture14 - Rotational Dynamics Rotational Examples...

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Rotational Dynamics Rotational Dynamics Examples involving τ = Ι α Parallel-axis theorem Text sections 10.5, 10.7

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Moments of inertia for some familiar objects: (see Table 10.2 in the text for more): I=MR 2 I = ½ MR 2 L I = 1 / 12 ML 2 L I = 1 / 3 ML 2 You do not have to know how to derive any of these !
Quiz A uniform board is attached to the edge of a table at one end by a hinge. A coin is placed on the other end, and the free end of the board is held so that the board is horizontal. When the board is released: a) the board falls faster than the coin b) the board and coin fall freely together c) the coin would fall faster, but presses on the board d) it depends on the length of the board coin

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Two spinning tops have equal radius and mass, but whereas top B is a thin disc, top A has light spokes connecting the hub to an outer ring. The tops are spun by applying equal torques to the spindle. Which spins the fastest? Top View
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lecture14 - Rotational Dynamics Rotational Examples...

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