A Part Attached to the Fan Which Engages and Disengages

question 1

Short Answer

A part attached to the fan which engages and disengages as needed, allowing the fan blade to 'freewheel' once the vehicle reaches a certain speed, is a ____________________.

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Definitions:

Deep Sleep

A stage of sleep characterized by slow brain waves, reduced muscle activity, and minimal responsiveness to the environment, crucial for restorative processes.

Sleep Spindles

Sudden bursts of oscillatory brain activity visible on an EEG that occur during stage 2 of sleep, believed to play a role in learning and memory.

Stage 4

In various contexts, this could represent a specific phase in a process or development path, such as the fourth stage of sleep characterized by deep sleep or another sequential phase depending on the context.

REM

Rapid Eye Movement, a sleep phase characterized by eye movement, vivid dreams, and increased brain activity.