= 1. As shown in the figure m₁ 1.4kg, m₂ = 5.4kg and m3 = 8.6kg. Masses 1 and 3 are on the ends of a weightless rope which does not slip as it goes over the disk. Mass 2 is a solid disk of radius R = 36cm. The moment of inertia is I₂ = 2m₂R². Mass 1 is initially resting on the floor and mass 3 is suspended at a height h= 1.4m. When released mass 3 falls toward the floor. Using conservation of energy determine the velocity of the system just before m3 hits the floor. What is the angular velocity of the disk? What is the kinetic energy of each mass at this time? m₂
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- Three children are riding on the edge of a merry-go-round that is a disk of mass 96 kg, radius 1.1 m, and is spinning at 22 rpm. The children have masses of 20.4 kg, 26 kg, and 35 kg. M = 96 kgm1 = 20.4 kgm2 = 26 kgm3 = 35 kgr = 1.1 mf = 22 rpm A. What is the moment of inertia of the merry-go-round plus the children in kg⋅m2? B. If the child who has a mass of 26 moves to the center of the merry-go-round, what is the new moment of inertia in kg⋅m2? C. If the child who has a mass of 26 kg moves to the center of the merry-go-round, what is the new magnitude of angular velocity in rpm?In a physics lab, Asha is given a 10.1 kg uniform rectangular plate with edge lengths 63.7 cm by 54.7 cm. Her lab instructor requires her to rotate the plate about an axis perpendicular to its plane and passing through one of its corners, and then prepare a report on the project. For her report, Asha needs the plate's moment of inertia ?I with respect to given rotation axis. Calculate ?I .A student sits on a freely rotating stool holding two dumbbells, each of mass 2.93 kg (see figure below). When his arms are extended horizontally (Figure a), the dumbbells are 1,09 m from the axis of rotation and the student rotates with an angular speed of 0.745 rad/s. The moment of inertia of the student plus stool is 2.64 kg m² and is assumed to be constant. The student puls the dumbbells inward horizontally to a position 0.307 m from the rotation axis (Figure b) 1 (a) Find the new anguler speed of the student. rad/s (b) Find the kinetic energy of the rotating system before and after he pulls the dumbbells inward. Koefore Kate"
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