Question

A turntable with a moment of inertia of
5.4 × 10−3 kg. m2 reaches a constant rotational speed of 45 rpm from rest in 6.30
seconds.
a. Find the number of revolutions the turntable made during this time.
b. Determine the rotational work done by the applied torque for increasing the
angular speed from zero to 45 rpm.
c. While rotating at a constant rotational speed of 45 rpm, a mouse of 32-g was kept
15 cm from the center. Determine the new moment of inertia of the system
(turntable-mouse). (Consider the mouse as a point mass)
d. Determine the rotational speed of the new system (turntable-mouse)
e. The mouse walks to the center of the turntable. Calculate the angular speed of
the turntable when the mouse reaches the center.

Answer 1

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