A student sits on a rotating stool holding two 2.2-kg objects. When his arms are extended...

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Physics

A student sits on a rotating stool holding two 2.2-kg objects.When his arms are extended horizontally, the objects are 1.0 m fromthe axis of rotation and he rotates with an angular speed of 0.75rad/s. The moment of inertia of the student plus stool is 3.0 kg Â·m2 and is assumed to be constant. The student then pulls in theobjects horizontally to 0.46 m from the rotation axis. (a) Find thenew angular speed of the student. (b) Find the kinetic energy ofthe student before and after the objects are pulled in. beforeafter (c) Where does the energy difference come from/go to?

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4.4 Ratings (962 Votes)

Data 1075 radsecond I30 kgm2 m22 kg d11 m d2046 m Use a conservation of momentum approach Initially the rotational inertia of the student stool weights system is Inet1 I 2md12 74 I is the rotational inertia of empty See Answer

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