A solid and uniform disk of mass 8.0 kg and radius 25 cm is rotating at 1506 revolutions per minute (rpm) about an axis that goes through its center and perpendicular to the disk plane. A small particle of mass m is dropped vertically onto the disk, at a location 11.9 cm from the centre and moves together with the disk. The rotational speed of the setup is reduced to 1139 rpm. Find m (in unit of kg). The moment of inertia of a uniform disk around its rotational

College Physics
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Chapter1: Units, Trigonometry. And Vectors
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A solid and uniform disk of mass 8.0 kg and radius 25 cm is rotating at 1506 revolutions per minute (rpm) about an axis that goes through its center and perpendicular to the disk plane. A small particle of mass m is dropped vertically onto the disk, at a location 11.9 cm from the centre and moves together with the disk. The rotational speed of the setup is reduced to 1139 rpm. Find m (in unit of kg). The moment of inertia of a uniform disk around its rotational axis is I = MR2/2.

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