A 58.72 kg person holding a steel ball stands motionless on a frozen lake.
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Answer:
The kinetic energy of the disk is 254.4 J.
Explanation:
The kinetic energy of the disk is given by:
The moment of inertia of the solid disk is:
The mass is:
Now, we need to find the angular acceleration as follows:
Also, the torque is related to the tangential force:
Now, we can find the angular speed:
since it is started from rest
Finally, the kinetic energy of the disk is:
Therefore, the kinetic energy of the disk is 254.4 J.
I hope it helps you!