Consider a solid cylindrical disk rotating on an axis through its center. If the angular momentum of the disk increases, what can you conclude?
(Points : 1)
The net torque acting on the wheel was zero.

There was net torque acting on the disk.

The angular velocity remained unchanged.

The moment of inertia of the disk increased.

Question

Consider a solid cylindrical disk rotating on an axis through its center. If the angular momentum of the disk increases, what can you conclude?
(Points : 1)
       The net torque acting on the wheel was zero.

       There was net torque acting on the disk.

       The angular velocity remained unchanged.

       The moment of inertia of the disk increased.

anonymous · Answer

angular momentum is L=I*w 
I=inertia
w=angular velocity

anonymous · Answer

Also, inertia is determined by the geometry of an object. Since it is the same object increasing angular momentum we can rule out that the inertia of the disk increased.

anonymous · Answer

If I is constant, then we see if we decrease the angular velocity this would net a decrease in angular momentum (but it increases). Therefore, the last two choices are now ruled out.

anonymous · Answer

So, to increase its angular momentum we would need to increase the object's angular velocity. To change any objects speed a force must act upon it

anonymous · Answer

so c or D?

anonymous · Answer

neither. I just showed you those were not true

anonymous · Answer

a or b

anonymous · Answer

nvm i got the answer