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A student sits on a freely rotating stool holding two dumbels, each of mass of 3.00kg. When the student's arms are extended horizontally, the dumbbells are 1.0m from the axis of rotation and the student rotates with an angular speed of 0.75 rad/s. The rotational inertia of the student and the stool is 3.0 kgm2 and is assumed to be constant. The student pulls the dumbbells inward horizontally to a position 0.30m from the rotational axis.
a. What is the new angular speed of the student?
b. find the kinetic energy rotating system before and after he pulls the dumbbells inward?
Two coils have the same number of circular turns and carry the same current. Each rotates in a magnetic field acting perpendicularly to its axis of rotation, What is the radius (in cm) of coil 2
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The specific heat of water is 4186 J/kg•K. The latent heat of fusion is 333 kJ/kg. The density of water is 1.0 g/cm.
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