Two Pendulum Bobs of Unequal Mass Are Suspended from the Same

question 13

Multiple Choice

Two pendulum bobs of unequal mass are suspended from the same fixed point by strings of equal length.The lighter bob is drawn aside and then released so that it collides with the other bob on reaching the vertical position.The collision is elastic.What quantities are conserved in the collision?

• A)Both kinetic energy and angular momentum of the system
• B)Only kinetic energy
• C)Only angular momentum
• D)Angular speed of lighter bob
• E)None of the above

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Definitions:

Reticular Activating System

A network of neurons located in the brainstem that plays a key role in regulating wakefulness, alertness, and transitions between sleep and wakefulness.

Hypothalamus

A subcortical structure that plays a vital role in controlling many motivated behaviors, like eating, drinking, and sexual activity.

Prefrontal Cortex

A region of the brain associated with decision making, personality expression, cognitive planning, and moderating social behavior.

Circadian Rhythm

The natural, internal process that regulates the sleep-wake cycle and repeats roughly every 24 hours.