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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