Question

A ballet dancer is rotating about his own
vertical axis on smooth horizontal floor with
a time period 0.5sec. The dancer folds himself
close to his axis of rotation due to which his
radius of gyration decreases by 20%, then
his time period is
1) 0.1sec 2) 0.25sec 3) 0.32sec 4) 0.4sec​

Answer 1

Answer:

2 is answer of your question