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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A girl jumps from a height h on the end of a see-saw. The see-saw consists of a uniform plank of length I pivoted at its centre. The plank is horizontal before the girl jumps. The mass of the see-saw is twice the mass of the girl. Find the angular velocity of the plank just after the girl jumps on the plank.

A girl jumps from a height h on the end of a see-saw. The see-saw consists of a uniform plank of length I pivoted at its centre. The plank is horizontal before the girl jumps. The mass of the see-saw is twice the mass of the girl. Find the angular velocity of the plank just after the girl jumps on the plank.

A disk with moment of inertia I1 rotates about a frictionless drops onto the first disk. Because of friction between the surfaces the two eventually reach the same angular speed ω f. Calculate ω f. this one having moment of inertia I2 and initially not rotating vertical axle with angular speed ω i. A second disk