A student stands on a rotating disk holding 4-kg objects with each hand. hen his arms are extended horizontally, the object are at 0.8m from the axis of rotation and he rotates at 0.7 rad/sec. The moment of inertia of the student plus the disk is 3.00 kgm^2 and is assumed to be constant. The student the pulls the objects horizontally to 0.32 m from the rotation axis.
A. Calculate the total moment of inertia before and after.
B. Calculate the new angular velocity after.
C. The K.E before and after.
D. How much energy was lost in the process.
2 answers