Weekly 10: Center of Mass, Moment of Inertia, Rotation and Torque tem 18 180128

Question

Weekly 10: Center of Mass, Moment of Inertia, Rotation and Torque tem 18 180128 A 15-cm-diameter CD has a mass of 20 g Part A What is the CD's moment of inertia for rotation about a perpendicular axis through its center? Express your answer to two significant figures and include the appropriate units 1 0.00075 kg.m Submit Previous Answers Request Answer X Incorrect: Try Again; 29 attempts remaining Part B What is the CD's moment of inertia for rotation about a perpendicular axis through the edge of the disk? Express your answer to two significant figures and include the appropriate units. I-Value Units

Explanation / Answer

a)

Moment of inertia through its center

Icenter =(1/2)mr2 =(1/2)*0.02*(0.15/2)2

Icenter =5.625*10-5 Kg-m2

b)

MOment of inertia through the edge of the disk

I=Icenter+mr2=5.625*10-5+0.02*(0.15/2)2

I=1.6875*10-4 Kg-m2

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