Your electric drill has been on for a period of time and you turn it off. The time interval for the rotating bit to come to rest due to frictional torque is You replace the bit with a smaller one that results in a smaller moment of inertia of the entire rotating mechanism of the drill by a factor of 2/3. When this smaller bit is rotated at the same angular speed as the first and the drill is turned off, the frictional torque remains the same as that for the previous situation. The time for this second bit to come to rest is
a.
b.
c.
d.