Answer:
Smaller by 7 times
Explanation:
Rotational mass is called moment of inertia
So, initial moment of inertia, I1 = I
initial angular velocity, ω1 = ω
Final moment of inertia, I2 = 7I
Final angular velocity, ω2 = ω/7
The kinetic energy in rotational motion is given by
So, initial kinetic energy of rotation
So, final kinetic energy of rotation
Thus, teh kinetic energy becomes smaller by 7 times.