A Uniform Disk, a Thin Hoop, and a Uniform Sphere

question 15

Multiple Choice

A uniform disk, a thin hoop, and a uniform sphere, all with the same mass and same outer radius, are each free to rotate about a fixed axis through its center. Assume the hoop is connected to the rotation axis by light spokes. With the objects starting from rest, identical forces are simultaneously applied to the rims, as shown. Rank the objects according to their angular momenta after a given time t, least to greatest.

• A) all tie
• B) disk, hoop, sphere
• C) hoop, disk, sphere
• D) hoop, sphere, disk

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Definitions:

Valves

Structures present in the heart and veins that maintain unidirectional flow of blood by opening and closing in response to pressure differences.

Venous Valves

Structures within veins that prevent the backward flow of blood, crucial for blood returning to the heart.

Tunica Media

The middle layer of the wall of a blood vessel consisting mainly of smooth muscle cells and elastic fibers, responsible for regulating the diameter of the vessel.

Lumen

The inside space of a tubular structure, such as a blood vessel or intestine.