A small block isrotating in a horizontal circle at the end of a thread which passes down through a hole at the centre of table top. If the system is rotating at 2.5 rps in a circle of 30 m radius what will be the speed of rotation when the thread is pulled inwards to decrease the radius to 10 m?

A small block isrotating in a horizontal circle at the end of a thread

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1.	A small block isrotating in a horizontal circle at the end of a thread which passes down through a hole at the centre of table top. If the system is rotating at 2.5 rps in a circle of 30 m radius what will be the speed of rotation when the thread is pulled inwards to decrease the radius to 10 m?
Answer» ANSWER :22.5 RPS