A System Comprised Blocks, a Light Frictionless Pulley, and Connecting

question 20

Multiple Choice

A system comprised blocks, a light frictionless pulley, and connecting ropes is shown in the figure. The 9.0-kg block is on a perfectly smooth horizontal table. The surfaces of the 12-kg block are rough, with μk = 0.30 between the block and the table. If the 5.0-kg block accelerates downward when it is released, find its acceleration.

• A) 1.0 m/s²
• B) 1.2 m/s²
• C) 1.4 m/s²
• D) 1.6 m/s²
• E) 1.8 m/s²

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Definitions:

ATPase Activity

The enzymatic activity involved in hydrolyzing ATP (adenosine triphosphate) to release energy.

Thin Myofilament

A component of the muscle fiber responsible for muscle contraction, composed primarily of the protein actin.

Globular (G) Actin

A monomeric form of actin protein that can polymerize to form filamentous (F) actin, part of the cytoskeleton in cells.

ATP-Binding Site

A region on a protein where ATP (adenosine triphosphate) binds, often involved in energy transfer within cells.