A Boy Sits in a Tire That Is Attached to a Rope

question 81

Multiple Choice

A boy sits in a tire that is attached to a rope that passes over a pulley fastened to the ceiling and then passes back down to the boy's hands.The weight of the boy plus the tire is W.The force with which the boy must pull on the free end of the rope to support his weight in the tire is

• A)(1/2)W
• B)W
• C)2W
• D)(2/3)W
• E)(3/2)W

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Definitions:

Aortic Valve

A valve in the human heart between the left ventricle and the aorta that prevents blood from flowing back into the ventricle.

Vagal Stimulation

The activation of the vagus nerve, which can reduce heart rate, stimulate digestive activities, and influence various metabolic pathways and immune responses.

Stroke Volume

The quantity of blood expelled by the heart's left ventricle in a single beat.

Extracellular Ca2+

Calcium ions present outside of cells, playing significant roles in blood coagulation, neurotransmitter release, and muscle contraction.