A Fireman Is Sliding Down a Fire Pole

question 6

Multiple Choice

A fireman is sliding down a fire pole.As he speeds up,he tightens his grip on the pole,thus increasing the vertical frictional force that the pole exerts on the fireman.When the force exerted on his hands equals the force that Earth exerts on him,what happens to the fireman?

• A)The fireman comes to a stop.
• B)The fireman descends with slower and slower speed.
• C)The fireman descends with a smaller but non-zero acceleration.
• D)The fireman continues to descend, but with constant speed.
• E)The acceleration of the fireman is now upward.

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Definitions:

Utility per Dollar

A metric assessing the amount of utility or satisfaction a consumer receives per dollar spent on a good or service.

ADH

Antidiuretic Hormone, a hormone that helps to control the balance of water in the body by affecting the kidneys.

Water Reabsorption

The process by which water is taken back into the body from the filtrate produced by the kidneys during urine formation, thus maintaining fluid balance.

Collecting Ducts

The structures in the kidneys that receive urine from the nephrons and transport it into the renal pelvis, playing a key role in water and ion balance.