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Two wheels of moment of inertia 4 kgm² rotate side by side at the rate of 120 rev / min and 240 rev / min respectively in the opposite directions. If now both the wheels arc coupled by means of weigntless shaft so that both the wheels now rotate with a common angular speed, find the new speed of rotation. (Ans: 60 r.p.m.)
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180 rev/min
Explanation:
i1w1+i2w2=i3(w1+w2)
4(240+120)=w(8)
w=360/2
w=180 rev/min
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