13. Rotational Inertia & Energy
Intro to Moment of Inertia
Multiple Choice
Multiple ChoiceA solid disc 4 m in diameter has a moment of inertia equal to 30 kg m2 about an axis through the disc, perpendicular to its face. The disc spins at a constant 120 RPM. Calculate the mass of the disc.
A
1.88 kg
B
3.75 kg
C
7.5 kg
D
15 kg
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