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College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

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College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

Two point masses are the same distance R from an axis of rotation and have moments of inertia IA and IB. (a) If IB = 4 IA, what is the ratio mB/mA of the two masses? (b) At what distance from the axis of rotation should mass A be placed so that IB = IA?

(a)

To determine
The ratio mB/mA .

Explanation

Formula to calculate the moment of inertia is,

I=mR2

Therefore,

mAR2=4mBR2

(b)

To determine
The distance between mass A and the axis of rotation.

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