13. Rotational Inertia & Energy
Moment of Inertia of Systems
Multiple Choice
Multiple ChoiceThree small objects, all of mass 1 kg, are arranged as an equilateral triangle of sides 3 m in length, as shown. The left-most object is on (0m, 0m). Calculate the moment of inertia of the system if it spins about the (a) X axis; (b) Y axis.
A
(a) Ix = 6.8 kg•m2;
(b) Iy = 4.5 kg•m2
(b) Iy = 4.5 kg•m2
B
(a) Ix = 18 kg•m2;
(b) Iy = 11.3 kg•m2
(b) Iy = 11.3 kg•m2
C
(a) Ix = 9.0 kg•m2;
(b) Iy = 18 kg•m2
(b) Iy = 18 kg•m2
D
(a) Ix = 6.8 kg•m2;
(b) Iy = 11.3 kg•m2
(b) Iy = 11.3 kg•m2
4:12m
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