Author Question: An industrial fabrication process stamps out thin metal pieces, each in the shape of a square with a ... (Read 66 times)

jrubin · **on:** Jul 29, 2018

An industrial fabrication process stamps out thin metal pieces, each in the shape of a square with a circular hole in the middle, from a large thin sheet. These pieces are mounted in a large machine.

As these pieces heat up during regular machine operation, the diameter of the circular hole will A) decrease.
B) stay the same.
C) increase.
D) behave unpredictably causing the machine to malfunction.

Question 2

A figure skater is spinning slowly with arms outstretched. She brings her arms in close to her body and her moment of inertia decreases by 1/2. By what factor does her rotational kinetic energy change?

A) 2
B) 4
C)
D) 1/2
E) It doesn't change.