Here, r is the distance of that point from the axis of rotation. e Example 3...

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Here, r is the distance of that point from the axis of rotation. e Example 3 A uniform circular disc has radius R and mass m. A particle, also of mass m, is fixed at a point A on the edge of the disc as shown in the figure. The dise can rotate freely about a horizontal chord PQ that is at a distance RI4 from the centre C of the disc. The line AC is perpendicular to PQ. Initially the disc is held vertical with the point A at its highest position. It is then allowed to fall, so that it starts rotation about PQ. Find the linear speed of the particle as it reaches its lowest position. (JEE 19 Solution Initial and final positions are shown below. Decrease in potential energy of mass 5 mgR Here, r is the distance of that point from the axis of rotation. e Example 3 A uniform circular disc has radius R and mass m. A particle, also of mass m, is fixed at a point A on the edge of the disc as shown in the figure. The dise can rotate freely about a horizontal chord PQ that is at a distance RI4 from the centre C of the disc. The line AC is perpendicular to PQ. Initially the disc is held vertical with the point A at its highest position. It is then allowed to fall, so that it starts rotation about PQ. Find the linear speed of the particle as it reaches its lowest position. (JEE 19 Solution Initial and final positions are shown below. Decrease in potential energy of mass 5 mgR