A ballet dancer spins about a vertical axis at 120 rpm with arms outstretched. With her arms folded, the moment of inertia about the axis of rotation decreases by 4%. Calculate the new rate of rotation.

A ballet dancer spins about a vertical axis at 120 rpm with arms outst

1.	A ballet dancer spins about a vertical axis at 120 rpm with arms outstretched. With her arms folded, the moment of inertia about the axis of rotation decreases by 4%. Calculate the new rate of rotation.
Answer» <html><body><p></p>Solution :`n_(1)=<a href="https://interviewquestions.tuteehub.com/tag/120-270396" style="font-weight:bold;" target="_blank" title="Click to know more about 120">120</a>` rpm, `n_(2)=?` <br/> `I_(1(omega_(1)=I_(2)omega_(2)` <br/> <a href="https://interviewquestions.tuteehub.com/tag/let-11597" style="font-weight:bold;" target="_blank" title="Click to know more about LET">LET</a> `I_(1)=<a href="https://interviewquestions.tuteehub.com/tag/100-263808" style="font-weight:bold;" target="_blank" title="Click to know more about 100">100</a>` units , then `I_(2)=<a href="https://interviewquestions.tuteehub.com/tag/60-328817" style="font-weight:bold;" target="_blank" title="Click to know more about 60">60</a>` units <br/> `100xx120=60xxomega_(2)` <br/> `omega_(2)=200`rpm</body></html>