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A wheel #1 with inertia I is mounted on a vertical shaft of negligble inertia. Wheel...

A wheel #1 with inertia I is mounted on a vertical shaft of negligble inertia. Wheel #1 is rotating at 660 rpm. Wheel #2, with triple the rotational inertia of the bottom wheel and spinning in the opposite direction at 110 rpm, is suddenly dropped onto the shaft to combine with wheel #1. The resultant combination of the two wheels and shaft will rotate at what rpm?

A. 83 B. 110 C. 250 D. 990 E. 0

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Answer #1

I, = I anol W,= 660rpm · 12 = 3 I and W2=-110 rpm Here law of conservation of angule momentary L=Lg I, co + 12 CO2 = (1 + Ig)

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