A) 96 h
B) 48 h
C) 6 h
D) 1.5 h
Correct Answer: D
Solution :
We know that angular momentum of spin \[\text{=}\,\text{I }\!\!\omega\!\!\text{ }\] By the conservation of angular momentum \[\frac{2}{5}M{{R}^{2}}.\frac{2\pi }{T}=\frac{2}{5}M{{\left( \frac{R}{4} \right)}^{2}}.\frac{2\pi }{T}\] \[T=\frac{T}{16}=\frac{24}{16}=1.5h\]
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