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77. A uniform heavy disc is rotating at constant angular velocity ω about a vertical axis through its centre and perpendicular to the plane of the disc. Let L be its angular momentum.  A lump of plasticine is dropped vertically on the disc and sticks to it.  Which will be constant

(a)    w

(b)   w and L both

(c)   L only

(d)  Neither w nor L

Ans. c

(45)

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