A particle is tied to $20\,cm$ long string. It performs circular motion in vertical plane. What is the angular velocity of string when the tension in the string at the top is zero .......... $rad/sec$
A particle is tied to $20\,cm$ long string. It performs circular motion in vertical plane. What is the angular velocity of string when the tension in the string at the top is zero .......... $rad/sec$
$5$
$2$
$7.5$
$7$
A particle is tied to $20\,cm$ long string. It performs circular motion in vertical plane. What is the angular velocity of string when the tension in the string at the top is zero .......... $rad/sec$
$\omega = \sqrt {\frac{g}{r}} = \sqrt {\frac{{9.8}}{{0.2}}} = 7\,rad/s$