An old fashion record is spinning freely at 78 rpm, Physics

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An old fashion record is spinning freely at 78 rpm

An old fashion record is spinning freely at 78 rpm (revolutions per minute) when another record is dropped (lightly) vertically on it. Now there are two records turning together at 39 rpm, because a. rotational energy is conserved b. vertical motion is uncoupled to planar motion c. Kepler’s 2nd law d. angular momentum is conserved e. none of these

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Physics: An old fashion record is spinning freely at 78 rpm

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