Physics, 04.11.2019 21:31 lucywood2024
Astudent sits on a rotating stool holding two 2.6-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 0.29 m from the rotation axis.
a) find the new angular speed of the student.
rad/s
(b) find the kinetic energy of the student before and after the objects are pulled in.
before: j
after: j
Answers: 3
![[3+2\times 2.6\times (1)^2]\times 0.75=[3+2\times 2.6\times (0.29)^2]\times \omega_f](/tpl/images/0359/2202/b6c32.png)
![KE_i=\frac{1}{2} [3+2\times 2.6\times (1)^2]\times 0.75^2](/tpl/images/0359/2202/88131.png)
![KE_f=\frac{1}{2} [3+2\times 2.6\times (0.29)^2]\times 1.7892^2](/tpl/images/0359/2202/30a3c.png)
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Astudent sits on a rotating stool holding two 2.6-kg objects. when his arms are extended horizontall...
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