Two children are riding on a merry-go-round ChikJ Aisata greater distance from t

Question

Two children are riding on a merry-go-round ChikJ Aisata greater distance from the axis of rotation than chikJ B Which child has the larger angular displacement? Child A Child B They have the same zero angular displacement They have the same non-zero angular displacement There is not enough information to answer this question In a lab experiment. a student brings up the rotational speed of a rotational motion apparatus to 30.0 rpm She then allows the apparatus to stow down on its own. and counts 240 revolutions before the apparatus comes to a stop The moment of inertia of the apparatus is 0.0850 kg m2 What is the retarding torque on the flywheel?

Explanation / Answer

1) They have same non zero angular displacement

2) 240 rev = 1507.964 rad

30 rpm = 3.1416 rad/s

Wf^2 - Wi^2 = 2*alpha*S

0-3.1416^2 = 2*alpha*1507.964

alpha = -3.27x10^-3 rad/s^2

torque = I*alpha

torque = 0.085*3.27x10^-3 = 2.78x10^-4

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