Question

A small mass is placed on a turntable that is rotating at 45 rpm. The centripetal acceleration is Select one O a. greater when the mass is closer to the center of the circle o b. greater when the mass is farther from the center of the circle O c. independent of the location of the mass o d. zero PREVIOUS PAGE

Answer 1

Centripetal acceleration of the mass at a location at a distance r from the center is given by
$a=\omega^2 r$
where, $\omega$ is the angular velocity of the turntable. So, if $\omega$ is kept constant, then, centripetal acceleration, a, is proportional to the radius, r, i.e.,
  $a\propto r$
So, the acceleration is greater when the distance r is greater.

So, option (b) is correct.