If the frequency of an object in uniform circular motion is doubled, its acceleration becomes
Two times
Four times
Half
One fourth
The angular acceleration of a body, moving along the circumference of a circle, is :
A fan is making $600$ revolutions per minute. If after some time it makes $1200 $ revolutions per minute, then increase in its angular velocity is
Certain neutron stars are believed to be rotating at about $1\,rev/\sec $. If such a star has a radius of $ 20\, km$, the acceleration of an object on the equator of the star will be
The centripetal acceleration is given by
A horizontal curve on $a$ racing track is banked at a $45^o $ angle. When a vehicle goes around this curve at the curve’s safe speed (no friction needed to stay on the track), what is its centripetal acceleration?