A professor sits on a rotating stool that is spinning at 10.0 rpm while she holds a heavy weight in each of her hands. Her outstretched hands are 0.735 m from the axis of rotation, which passes through her head into the center of the stool. When she symmetrically pulls the weights in closer to her body, her angular speed increases to 36.5 rpm. Neglecting the mass of the professor, how far are the weights from the rotational axis after she pulls her arms in?
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A professor sits on a rotating stool that is spinning at 10.0 rpm while she holds a heavy weight in each of her hands. Her outstretched hands are 0.735 m from the axis of rotation, which passes through her head into the center of the stool. When she symmetrically pulls the weights in closer to her body, her angular speed increases to 36.5 rpm. Neglecting the mass of the professor, how far are the weights from the rotational axis after she pulls her arms in?
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- A typical helicopter with four blades rotates at 300 rpm and has a kinetic energy of 2.45 105 J. What is the total moment of inertia, in kg · m2 of the blades?A student sits on a rotating stool holding two 2.7-kg objects. When his arms are extended horizontally, the objects are 1.0 m from the axis of rotation and he rotates with an angular speed of 0.75 rad/s. The moment of inertia of the student plus stool is 3.0 kg · m2 and is assumed to be constant. The student then pulls in the objects horizontally to 0.38 m from the rotation axis. (a) Find the new angular speed of the student. rad/s 1.677 (correct)(b) Find the kinetic energy of the student before and after the objects are pulled in. before ?? after ???In figure skating, kelen rotated at an angular speed of 9.04 rad/s with her arms pulled in. At the arena, watching her performance, a graduate student calculated that her moment of inertia with arms pulled in was 3.05 kmg^2. After 45 seconds, kelen extends her arms, and her angular speed changed to 4.37 rad/s. What is kelens new moment of inertia?
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