The Mass of the Rectangle in the Figure Is M,the

question 11

Multiple Choice

The mass of the rectangle in the figure is M,the mass of the ring is M,and the mass of the circle is 3M.The center of mass of the system with respect to the origin O is located at point

• A)1
• B)2
• C)3
• D)4

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Definitions:

Melatonin

A hormone secreted by the pineal gland that plays a role in setting circadian rhythms.

Biological Rhythms

Natural processes that cyclically change over a period of time in living organisms, such as the circadian rhythm or menstrual cycle.

Onset of Sleep

The transition period from wakefulness to sleep, marking the beginning of the sleep cycle.

Hypersecretion

Abnormally increased output of a secreted material. Compare with hyposecretion.