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A small ball at the end of a string that passes through a tube is swung...

A small ball at the end of a string that passes through a tube is swung in a circle. When the string is pulled downward through the tube the angular speed of the ball:


A) increases;
B) decreases;
C) does not change;

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Answer #1

Answer:

When the string is pulled downward through the tube the angular speed of the ball: (A) increases.

Because, According to the conservation of Angular momentum - The angular momentum remains constant.

Thus, if the radius of the circular motion decrease (Its moment of inertia decrease) and Hence, its angular velocity will increase.

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