A student is at rest on a stool that may freely spin about its central axis of rotation. As the stool spins, the student holds onto two dumbbells as the stool spins at an angular speed of 1.2rad/s with the students arms completely stretched out from the students body. At this instant, the student-dumbbell system has rotational inertia of $ 6 kgcdot m^2$ he student then brings their arms close to their body, and rotational inertia of the student-dumbbell system is changed to $ 2 kgcdot m^2$ . What is the new angular speed of the student?

PHYSICS

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

A student is at rest on a stool that may freely spin about its central axis of rotation. As the stool spins, the student holds onto two dumbbells as the stool spins at an angular speed of 1.2rad/s with the student’s arms completely stretched out from the student’s body. At this instant, the student-dumbbell system has rotational inertia of

A	0.4 rad/s
B	1.2 rad/s
C	3.6 rad/s
D	7.2 rad/s

Explanation:

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SSC MTS EXAM

SSC

PHYSICS